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Fair Value of Financial Instruments - Estimated Fair Value and Carrying Value of Financial Instrument (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Financial assets: |  |  |  |
Investment securities held-to-maturity | $ 13,867 | $ 12,728 |  |
SBA servicing asset | 4,400 | 5,200 |  |
Investment in BFG | 4,000 | 4,800 | $ 4,500 | $ 5,900
Level 1 | Carrying Amount |  |  |  |
Financial assets: |  |  |  |
Cash and cash equivalents | 126,771 | 100,567 |  |
Level 1 | Estimated Fair Value |  |  |  |
Financial assets: |  |  |  |
Cash and cash equivalents | 126,771 | 100,567 |  |
Level 2 | Carrying Amount |  |  |  |
Financial assets: |  |  |  |
Investment securities held-to-maturity | 15,840 | 14,292 |  |
Investment in FHLB stock | 476 | 449 |  |
Loans held-for-sale | 45,710 | 23,589 |  |
Accrued interest receivable | 2,711 | 1,818 |  |
SBA servicing asset | 4,398 | 5,210 |  |
Financial liabilities: |  |  |  |
Total deposits | 386,753 | 242,998 |  |
Accrued interest payable | 581 | 54 |  |
PPP Liquidity Facility | 221 | 314 |  |
Level 2 | Estimated Fair Value |  |  |  |
Financial assets: |  |  |  |
Investment securities held-to-maturity | 13,867 | 12,728 |  |
Investment in FHLB stock | 476 | 449 |  |
Loans held-for-sale | 45,710 | 23,589 |  |
Accrued interest receivable | 2,711 | 1,818 |  |
SBA servicing asset | 4,398 | 5,210 |  |
Financial liabilities: |  |  |  |
Total deposits | 361,998 | 221,287 |  |
Accrued interest payable | 581 | 54 |  |
PPP Liquidity Facility | 221 | 314 |  |
Level 3 | Carrying Amount |  |  |  |
Financial assets: |  |  |  |
Loans held for investment | 324,197 | 224,217 |  |
Investment in BFG | 4,000 | 4,800 |  |
Level 3 | Estimated Fair Value |  |  |  |
Financial assets: |  |  |  |
Loans held for investment | 343,070 | 237,225 |  |
Investment in BFG | $ 4,000 | $ 4,800 |  |

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