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Loans Held for Investment and Allowance for Credit Losses - Allowance for Loan Losses on Impaired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Allowance for Loan Losses
Total	$ 12,986	$ 12,321	$ 11,985	$ 11,968	$ 10,602	$ 9,855
Portfolio Loan Balances
Total	337,635		236,601
Financing Receivable, Incurred Loss Methodology
Allowance for Loan Losses
Individually			0
Collectively			11,985
Total	12,986		11,985
Portfolio Loan Balances
Individually			450
Collectively			236,151
Total	337,635		236,601
SBA
Allowance for Loan Losses
Total				3,809	3,384	2,739
Portfolio Loan Balances
Total			145,172
SBA | Financing Receivable, Incurred Loss Methodology
Allowance for Loan Losses
Individually			0
Collectively			4,294
Total			4,294
Portfolio Loan Balances
Individually			450
Collectively			144,722
Total			145,172
Commercial, non-real estate
Allowance for Loan Losses
Total				464	274	132
Portfolio Loan Balances
Total			11,484
Commercial, non-real estate | Financing Receivable, Incurred Loss Methodology
Allowance for Loan Losses
Individually			0
Collectively			401
Total			401
Portfolio Loan Balances
Individually			0
Collectively			11,484
Total			11,484
Residential real estate
Allowance for Loan Losses
Total	934	708	876	453	415	352
Portfolio Loan Balances
Total	49,046		37,815
Residential real estate | Financing Receivable, Incurred Loss Methodology
Allowance for Loan Losses
Individually			0
Collectively			497
Total			497
Portfolio Loan Balances
Individually			0
Collectively			37,815
Total			37,815
Retained Strategic Program loans
Allowance for Loan Losses
Total	7,196	7,256	6,701	7,147	6,442	6,549
Portfolio Loan Balances
Total	20,040		24,259
Retained Strategic Program loans | Financing Receivable, Incurred Loss Methodology
Allowance for Loan Losses
Individually			0
Collectively			6,701
Total			6,701
Portfolio Loan Balances
Individually			0
Collectively			24,259
Total			24,259
Commercial real estate
Allowance for Loan Losses
Total	3,571	3,167	3,238	29	22	21
Portfolio Loan Balances
Total	183,579		12,063
Commercial real estate | Financing Receivable, Incurred Loss Methodology
Allowance for Loan Losses
Individually			0
Collectively			27
Total			27
Portfolio Loan Balances
Individually			0
Collectively			12,063
Total			12,063
Consumer
Allowance for Loan Losses
Total	103	$ 90	65	$ 66	$ 65	$ 62
Portfolio Loan Balances
Total	$ 6,870		5,808
Consumer | Financing Receivable, Incurred Loss Methodology
Allowance for Loan Losses
Individually			0
Collectively			65
Total			65
Portfolio Loan Balances
Individually			0
Collectively			5,808
Total			$ 5,808

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