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Loans Held for Investment and Allowance for Credit Losses - Portfolio Classes by Incurred Loss Methodology (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Retained Strategic Program loans | $ 337,635 | $ 236,601
Financing Receivable, Incurred Loss Methodology |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Retained Strategic Program loans | 337,635 | 236,601
SBA |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Retained Strategic Program loans |  | 145,172
SBA | Financing Receivable, Incurred Loss Methodology |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Retained Strategic Program loans |  | 145,172
Commercial, non-real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Retained Strategic Program loans |  | 11,484
Commercial, non-real estate | Financing Receivable, Incurred Loss Methodology |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Retained Strategic Program loans |  | 11,484
Residential real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Retained Strategic Program loans | 49,046 | 37,815
Residential real estate | Financing Receivable, Incurred Loss Methodology |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Retained Strategic Program loans |  | 37,815
Retained Strategic Program loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Retained Strategic Program loans | 20,040 | 24,259
Retained Strategic Program loans | Financing Receivable, Incurred Loss Methodology |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Retained Strategic Program loans |  | 24,259
Commercial real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Retained Strategic Program loans | 183,579 | 12,063
Commercial real estate | Financing Receivable, Incurred Loss Methodology |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Retained Strategic Program loans |  | 12,063
Consumer |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Retained Strategic Program loans | $ 6,870 | 5,808
Consumer | Financing Receivable, Incurred Loss Methodology |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Retained Strategic Program loans |  | $ 5,808

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