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Loans Held for Investment and Allowance for Credit Losses - Changes in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Total allowance for loan losses
Beginning Balance	$ 12,321	$ 10,602	$ 11,985	$ 9,855
Provision (Reversal) of Credit Losses	2,910	4,457	8,253	10,317
Charge-Offs	(2,914)	(3,333)	(8,801)	(8,904)
Recoveries	669	242	1,292	700
Ending Balance	12,986	11,968	12,986	11,968
Unfunded lending commitments
Beginning Balance	42		0
Provision for Credit Losses	160		176
Charge-Offs	0		0
Recoveries	0		0
Ending Balance	202		202
Total allowance for credit losses
Beginning Balance	12,363		11,985
Provision for Credit Losses	3,070		8,429
Charge-Offs	(2,914)		(8,801)
Recoveries	669		1,292
Ending Balance	13,188		13,188
Impact of ASU 2016-13 adoption
Total allowance for loan losses
Beginning Balance			257
Unfunded lending commitments
Beginning Balance			26
Total allowance for credit losses
Beginning Balance			283
Construction and land development
Total allowance for loan losses
Beginning Balance	279		424
Provision (Reversal) of Credit Losses	14		(64)
Charge-Offs	0		0
Recoveries	0		0
Ending Balance	293		293
Construction and land development | Impact of ASU 2016-13 adoption
Total allowance for loan losses
Beginning Balance			(67)
Residential real estate
Total allowance for loan losses
Beginning Balance	708	415	876	352
Provision (Reversal) of Credit Losses	223	38	150	101
Charge-Offs	0	0	(121)	0
Recoveries	3	0	87	0
Ending Balance	934	453	934	453
Residential real estate | Impact of ASU 2016-13 adoption
Total allowance for loan losses
Beginning Balance			(58)
Residential real estate multifamily
Total allowance for loan losses
Beginning Balance	6		3
Provision (Reversal) of Credit Losses	0		2
Charge-Offs	0		0
Recoveries	0		0
Ending Balance	6		6
Residential real estate multifamily | Impact of ASU 2016-13 adoption
Total allowance for loan losses
Beginning Balance			1
Commercial real estate
Total allowance for loan losses
Beginning Balance	3,167	22	3,238	21
Provision (Reversal) of Credit Losses	46	7	671	8
Charge-Offs	(31)	0	(153)	0
Recoveries	389	0	389	0
Ending Balance	3,571	29	3,571	29
Commercial real estate | Impact of ASU 2016-13 adoption
Total allowance for loan losses
Beginning Balance			(574)
Commercial and industrial
Total allowance for loan losses
Beginning Balance	287		339
Provision (Reversal) of Credit Losses	151		265
Charge-Offs	(107)		(191)
Recoveries	18		21
Ending Balance	349		349
Commercial and industrial | Impact of ASU 2016-13 adoption
Total allowance for loan losses
Beginning Balance			(85)
Consumer
Total allowance for loan losses
Beginning Balance	90	65	65	62
Provision (Reversal) of Credit Losses	39	5	69	8
Charge-Offs	(28)	(4)	(47)	(4)
Recoveries	2	0	2	0
Ending Balance	103	66	103	66
Consumer | Impact of ASU 2016-13 adoption
Total allowance for loan losses
Beginning Balance			14
Lease financing receivables
Total allowance for loan losses
Beginning Balance	528		339
Provision (Reversal) of Credit Losses	6		300
Charge-Offs	0		0
Recoveries	0		0
Ending Balance	534		534
Lease financing receivables | Impact of ASU 2016-13 adoption
Total allowance for loan losses
Beginning Balance			(105)
Retained Strategic Program loans
Total allowance for loan losses
Beginning Balance	7,256	6,442	6,701	6,549
Provision (Reversal) of Credit Losses	2,431	3,542	6,860	8,465
Charge-Offs	(2,748)	(3,070)	(8,289)	(8,508)
Recoveries	257	233	793	641
Ending Balance	$ 7,196	7,147	7,196	7,147
Retained Strategic Program loans | Impact of ASU 2016-13 adoption
Total allowance for loan losses
Beginning Balance			$ 1,131
SBA
Total allowance for loan losses
Beginning Balance		3,384		2,739
Provision (Reversal) of Credit Losses		675		1,405
Charge-Offs		(259)		(392)
Recoveries		9		57
Ending Balance		3,809		3,809
Commercial, non-real estate
Total allowance for loan losses
Beginning Balance		274		132
Provision (Reversal) of Credit Losses		190		330
Charge-Offs		0		0
Recoveries		0		2
Ending Balance		$ 464		$ 464

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