| Number of loans modified | 0.75 | 0.75 | 0.75 | 0.75 | 1.00 | 1.00 | 1.00 | 1.00 |
| Common Stock Dividends Per Share Declared | $0.1 | $0.1 | $0.1 | $0.1 | $0.1 | — | — | — |
| Change in Other Liabilities | -$3.8M | — | $3.2M | -$1.2M | -$3.8M | — | — | — |
| Share-Based Payment Tax Withholding Decrease | $1.1M | $0 | — | — | $912K | — | — | — |
| Tax Withholding for Share-Based Payments | $1.1M | — | — | $374K | $912K | — | — | — |
| Common Stock Dividends Per Share | $0.1 | $0.1 | $0.1 | $0.1 | $0.1 | — | — | — |
| Dividends per share declared | $0.1 | $0.1 | $0.1 | $0.1 | $0.1 | — | — | — |
| Reclassifications Net of Tax | -$10.6M | -$17M | -$565K | -$27.4M | -$6M | — | — | — |
| Net Change in Cash and Restricted Cash | -$14M | -$4.5M | -$22M | — | -$35.9M | — | — | — |
| Number of Operating Segments | 1.00 | — | — | — | 1.00 | — | — | — |
| ROU Asset Obtained - Operating Lease | $7.2M | — | — | — | $835K | — | — | — |
| Number of reportable segments | 1.00 | — | — | — | 1.00 | — | — | — |
| Dividends per share declared | $0.1 | $0.1 | $0.1 | $0.1 | $0.1 | — | — | — |
| Common Stock Dividends Per Share Declared | $0.1 | $0.1 | $0.1 | $0.1 | $0.1 | — | — | — |
| Interest Paid, Net | $26.3M | $24.9M | $22.9M | $20.7M | $18M | — | — | — |
| (Benefit from) provision for credit losses | $3.8M | $11M | -$1.6M | $14.4M | -$216K | — | — | — |
| Acquisition of working capital related to real estate owned | $63K | — | — | — | $0 | — | — | — |
| Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation | $1.1M | $0 | — | — | $912K | — | — | — |
| Amortization of Above Market Lease | $70K | $78K | $74K | $64K | $57K | — | — | — |
| Amortization Of Below Market Lease | $8K | $13K | $14K | $14K | $14K | — | — | — |
| Amortization Of Deferred Loan Origination Fees Net | $1.9M | $1M | $962K | $592K | $1.7M | — | — | — |
| Amortization Of Financing Costs And Discounts | $1.2M | $1.3M | $723K | $872K | $778K | — | — | — |
| Amortization of capitalized software and acquired intangible assets | $735K | $944K | $922K | $856K | $778K | — | — | — |
| Lease commissions | $61K | $74K | $73K | $98K | $105K | — | — | — |
| Stock options excluded as their inclusion would be anti-dilutive (in shares) | $0 | — | — | — | $0 | — | — | — |
| Dividends declared (in dollars per share) | $0.1 | $0.1 | $0.1 | $0.1 | $0.1 | — | — | — |
| Comprehensive Income (Loss), Net of Tax, Attributable to Parent | -$10.6M | — | — | — | -$6M | — | — | — |
| Dividends, Common Stock, Cash | $2.6M | $2.6M | $2.5M | $2.6M | $2.6M | — | — | — |
| Effective tax rates | -$0 | -$0 | -$0 | -$0 | — | — | — | — |
| Limitation on executive compensation | $111.5K | $111.5K | $111.5K | $111.5K | — | — | — | — |
| Limitation on executive compensation | -0.3% | -0.3% | -0.3% | -0.3% | — | — | — | — |
| Other | $0 | $0 | $0 | $0 | — | — | — | — |
| Share-based compensation | -0.3% | -0.3% | -0.3% | -0.3% | — | — | — | — |
| State income taxes – net of federal income tax benefit | -$0 | -$0 | -$0 | -$0 | — | — | — | — |
| Gross charge-offs | $24.6M | $36.1M | $19.8M | $0 | — | — | — | — |
| Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss And Off-Balance-Sheet, Credit Loss, Liability, Writeoff | $24.6M | $36.1M | $19.8M | $0 | — | — | — | — |
| Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, And Off-Balance-Sheet, Credit Loss, Liability, Recovery | $89.5K | $89.5K | $89.5K | $89.5K | $300K | — | — | — |
| Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) | $24.6M | $36.1M | $19.8M | $0 | $0 | — | — | — |
| Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery | $89.5K | $89.5K | $89.5K | $89.5K | $300K | — | — | — |
| Increase (decrease) in allowance for credit losses | -$20.9M | -$25.1M | -$21.4M | — | $100K | — | — | — |
| Financing Receivable, Excluding Accrued Interest And Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) | $3.8M | $11M | -$1.6M | $14.4M | -$216K | — | — | — |
| Loan assumed | $1.7M | — | — | $6.5M | $1.4M | — | — | — |
| Provision for credit losses | $2.2M | $10.8M | -$1.3M | $14.6M | $1.1M | — | — | — |
| Financing Receivable, Excluding Accrued Interest, Increase (Decrease) From Net Deferred Origination Fees | -$329K | -$254K | -$949K | -$460K | -$128K | — | — | — |
| Financing Receivable, Excluding Accrued Interest, Originated, More than Six Years before Current Fiscal Year, Writeoff | $24.6M | $20.7M | $19.8M | $0 | $0 | — | — | — |
| Purchases | $10.5M | $13.5M | $12.7M | $14M | $14.3M | — | — | — |
| Financing Receivable, Excluding Accrued Interest, Reclassification to Real Estate Owned | $63.4M | $0 | $0 | $0 | — | — | — | — |
| Sales | $83.8M | $93.2M | $103M | $44.8M | $176.5M | — | — | — |
| Transfer of other investments to loans held-for-investment | $182.5K | $182.5K | $182.5K | $182.5K | — | — | — | — |
| Financing Receivable, Excluding Accrued Interest, Transfers To Loans Held-for-sale, Net Of Discount At Time of Transfer | $0 | $0 | $0 | $0 | $12.9M | — | — | — |
| Transfers in of other investments from other assets | $182.5K | $182.5K | $182.5K | $182.5K | — | — | — | — |
| Transfer of other receivables to loans held-for-investment | $245K | $245K | $245K | $245K | — | — | — | — |
| Term loan by year, year 4 | $0 | $0 | $0 | $0 | $0 | — | — | — |
| Term loan by year, year 1 | $0 | $0 | $0 | $0 | $0 | — | — | — |
| Term loan by year, year 2 | $0 | $0 | $0 | $0 | $0 | — | — | — |
| Term loan by year, year 3 | $0 | $0 | $0 | $0 | $0 | — | — | — |
| Term loan by year, year 5 | $0 | $15.4M | — | — | $0 | — | — | — |
| Financing Receivable, Held for Investment, Nonaccrual, Removal | $98.3M | $95.4M | $35.5M | $75M | $150K | — | — | — |
| Addition of nonaccrual loan amortized cost | $0 | $0 | $20.2M | $88.1M | $65.9M | — | — | — |
| Impairment Of Real Estate | $1.7M | $1.7M | $1.7M | $1.7M | — | — | — | — |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | -$2.2M | -$2.2M | -$2.2M | -$2.2M | — | — | — | — |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount | -$19.8K | -$19.8K | -$19.8K | -$19.8K | — | — | — | — |
| Share-based compensation | $137.8K | $137.8K | $137.8K | $137.8K | — | — | — | — |
| Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | $18K | $18K | $18K | $18K | — | — | — | — |
| Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount | -$1.9M | -$1.9M | -$1.9M | -$1.9M | — | — | — | — |
| Increase Decrease In Accrued Interest Receivable Net | $176K | $77K | $75K | $0 | -$616K | — | — | — |
| Increase (Decrease) in Other Operating Assets | $1.5M | $1.8M | $2.5M | — | -$1.8M | — | — | — |
| Other liabilities | -$3.8M | — | $3.2M | -$1.2M | -$3.8M | — | — | — |
| Interest and Dividend Income, Operating | $35.1M | $33.8M | $33.7M | $29.1M | $26M | — | — | — |
| Loans held-for-investment | $34.3M | $33M | $33M | $28.4M | $25.6M | — | — | — |
| Beneficial interest issued by consolidated VIEs | $12.7M | $12.6M | $12.2M | $10.7M | $9.1M | — | — | — |
| Mortgage loan payable | $0 | — | — | — | $327K | — | — | — |
| Secured credit facility | $2.5M | $2.6M | $2.4M | $2.1M | $1.8M | — | — | — |
| Deposits at banks | $817K | $779K | $714K | $633K | $422K | — | — | — |
| Interest Paid, Excluding Capitalized Interest, Operating Activity | $26.3M | $24.9M | $22.9M | $20.7M | $18M | — | — | — |
| Cash Provided by (Used in) Financing Activity, Including Discontinued Operation | -$88.4M | -$100.9M | -$116.8M | -$29.9M | -$207.1M | — | — | — |
| Cash Provided by (Used in) Investing Activity, Including Discontinued Operation | $80.1M | $95.6M | $90.3M | $33M | $173.6M | — | — | — |
| Cash Provided by (Used in) Operating Activity, Including Discontinued Operation | -$5.7M | — | — | $3.1M | -$2.4M | — | — | — |
| Number of operating segments | $1 | — | — | — | $1 | — | — | — |
| Number of reportable segments | $1 | — | — | — | $1 | — | — | — |
| Lease income — operating leases | $2.5M | $3.4M | $3.4M | $2.7M | $2.9M | — | — | — |
| Other Depreciation and Amortization | $1.4M | $2.1M | $2.2M | $2.1M | $2M | — | — | — |
| Payment For Acquisition Costs, Real Estate, Held-for-Investment | $1.6M | — | — | — | $0 | — | — | — |
| Payments for Repurchase of Common Stock | $2.5M | $3.1M | — | — | $306K | — | — | — |
| Payments of Ordinary Dividends, Common Stock | $2.6M | $2.6M | $2.6M | $2.6M | $2.6M | — | — | — |
| Payments of Ordinary Dividends, Preferred Stock and Preference Stock | $3.6M | $3.6M | $3.6M | $3.6M | $3.6M | — | — | — |
| Payment, Tax Withholding, Share-Based Payment Arrangement | $1.1M | — | — | $374K | $912K | — | — | — |
| Payments to Acquire Loans and Leases Held-for-investment | $10.1M | $13M | $11.3M | $13.2M | $13.8M | — | — | — |
| Payments to Acquire Other Investments | $1.9M | $683K | $657K | -$3.2M | $0 | — | — | — |
| Payment for Acquisition, Real Estate, Held-for-Investment | $303K | $1.7M | $769K | $1.4M | $2.3M | — | — | — |
| Preferred Stock Dividends Per Share Declared | $0.44 | $0.44 | $0.44 | $0.44 | $0.44 | — | — | — |
| Principal Payments on Assets Sold under Agreements to Repurchase | $63.3M | $73.8M | $36.3M | $24.1M | $91.7M | — | — | — |
| Principal repayments of loans held-for-investment held by servicer | $1.3M | — | — | — | $0 | — | — | — |
| Proceeds From Issuance Of Secured Debt | $4.5M | $4.5M | $4.5M | $4.5M | — | — | — | — |
| Repayments and sales of loans | $94M | $94.4M | $103M | $44.3M | $176.9M | — | — | — |
| Proceeds from Sale, Loan, Held-for-Investment | $0 | — | — | — | $12.9M | — | — | — |
| Real estate income | -$1.4M | -$1.5M | -$2.2M | -$2.5M | -$2.5M | — | — | — |
| Expenses from real estate owned operations | $4.5M | $5.2M | $5.8M | $5.6M | $5.8M | — | — | — |
| Real Estate Owned, Property Operating Revenue | $3.1M | $3.8M | $3.6M | $3.1M | $3.2M | — | — | — |
| Accrued interest receivable | $7.6M | — | — | — | — | — | — | — |
| Transfers from loan held-for investment and receivables to real estate owned | $71M | — | — | — | $0 | — | — | — |
| Gross realized gains (losses) | $0 | — | — | — | -$18K | — | — | — |
| Repayments of Accounts Receivable Securitization | $15.2M | $30M | $66.7M | $33.8M | $108M | — | — | — |
| Repurchase facilities | $11.9M | $10.6M | $8.9M | $8.5M | $6.8M | — | — | — |
| Servicing expenses | $1M | $817K | $862K | $894K | $743K | — | — | — |
| Stock-based compensation | $2.4M | $2.2M | $896K | $1M | $910K | — | — | — |
| Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value | $2.85 | $2.54 | $0.00 | — | $1.53 | — | — | — |
| Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value | $5.95 | $3.15 | $0.00 | — | $4.04 | — | — | — |
| Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value | $11.84 | $3.60 | $3.39 | — | $5.04 | — | — | — |
| Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture | $2.4M | $2.2M | $896K | $1M | $910K | — | — | — |
| Purchase price | $2.5M | $3.1M | — | — | $306K | — | — | — |
| Straight Line Rent | $0 | — | — | — | $57K | — | — | — |
| Loans reclassified to held for sale | $0 | — | — | — | $12.9M | — | — | — |
| Cash Dividends, Common Stock | $2.6M | $2.6M | $2.6M | $2.6M | $2.6M | — | — | — |
| Other Comprehensive Income (Loss) | -$10.6M | — | — | — | -$6M | — | — | — |
| Common Stock Dividends Per Share Declared | $0.1 | $0.1 | $0.1 | $0.1 | $0.1 | — | — | — |
| Common Stock Dividends Per Share Declared | $0.1 | $0.1 | $0.1 | $0.1 | $0.1 | — | — | — |
| Stock Repurchased During Period, Value | $2.5M | $3.1M | — | — | $306K | — | — | — |
