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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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