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Loans Held for Investment and Allowance for Credit Losses - Loans Summarized to Major Risk Category (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | $ 337,635 |  | $ 236,601 |  |  |
Allowance for credit losses | (12,986) | $ (12,321) | (11,985) | $ (11,968) | $ (10,602) | $ (9,855)
Net loans | 324,197 |  | 224,217 |  |  |
Financing Receivable, Incurred Loss Methodology |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 337,635 |  | 236,601 |  |  |
Deferred loan fees, net | (452) |  | (399) |  |  |
Allowance for credit losses | (12,986) |  | (11,985) |  |  |
Net loans | 324,197 |  | 224,217 |  |  |
SBA |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans |  |  | 145,172 |  |  |
Allowance for credit losses |  |  |  | (3,809) | (3,384) | (2,739)
SBA | SBA |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans |  |  | 300 |  |  |
SBA | Financing Receivable, Incurred Loss Methodology |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total Strategic Program loans | 219,305 |  | 145,172 |  |  |
Total loans |  |  | 145,172 |  |  |
Allowance for credit losses |  |  | (4,294) |  |  |
SBA | Financing Receivable, Incurred Loss Methodology | SBA |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total Strategic Program loans | 112,500 |  | 49,500 |  |  |
Commercial, non-real estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans |  |  | 11,484 |  |  |
Allowance for credit losses |  |  |  | (464) | (274) | (132)
Commercial, non-real estate | Financing Receivable, Incurred Loss Methodology |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total Strategic Program loans | 34,044 |  | 11,484 |  |  |
Total loans |  |  | 11,484 |  |  |
Allowance for credit losses |  |  | (401) |  |  |
Residential real estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 49,046 |  | 37,815 |  |  |
Allowance for credit losses | (934) | (708) | (876) | (453) | (415) | (352)
Residential real estate | Financing Receivable, Incurred Loss Methodology |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total Strategic Program loans | 34,891 |  | 37,815 |  |  |
Total loans |  |  | 37,815 |  |  |
Allowance for credit losses |  |  | (497) |  |  |
Strategic Program loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total Strategic Program loans | 65,750 |  | 47,848 |  |  |
Total loans | 20,040 |  | 24,259 |  |  |
Allowance for credit losses | (7,196) | (7,256) | (6,701) | (7,147) | (6,442) | (6,549)
Strategic Program loans | Financing Receivable, Incurred Loss Methodology |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total Strategic Program loans | 20,040 |  | 24,259 |  |  |
Total loans |  |  | 24,259 |  |  |
Allowance for credit losses |  |  | (6,701) |  |  |
Commercial real estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 183,579 |  | 12,063 |  |  |
Allowance for credit losses | (3,571) | (3,167) | (3,238) | (29) | (22) | (21)
Commercial real estate | Financing Receivable, Incurred Loss Methodology |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total Strategic Program loans | 21,680 |  | 12,063 |  |  |
Total loans |  |  | 12,063 |  |  |
Allowance for credit losses |  |  | (27) |  |  |
Consumer |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 6,870 |  | 5,808 |  |  |
Allowance for credit losses | (103) | $ (90) | (65) | $ (66) | $ (65) | $ (62)
Consumer | Financing Receivable, Incurred Loss Methodology |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total Strategic Program loans | $ 7,675 |  | 5,808 |  |  |
Total loans |  |  | 5,808 |  |  |
Allowance for credit losses |  |  | $ (65) |  |  |

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