Loans and Allowance for Credit Losses - Loans - Non-accrual loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable Nonaccrual Status
Balance	$ 488	$ 338
Transfer into non-accrual	482	751
Loans paid down/payoffs	(301)	(230)
Loans returned to accrual status	(19)	(29)
Loans charged off	(124)	(342)
Balance	527	488
Real Estate Loan
Financing Receivable Nonaccrual Status
Balance	104
Balance	145	104
Commercial and Industrial
Financing Receivable Nonaccrual Status
Balance	299
Balance	299	299
Consumer Loans
Financing Receivable Nonaccrual Status
Balance	85
Balance	83	85
Single-family Residential | Real Estate Loan
Financing Receivable Nonaccrual Status
Balance	104	123
Transfer into non-accrual	307	31
Loans paid down/payoffs	(266)	(50)
Balance	145	104
Commercial and Industrial | Commercial and Industrial
Financing Receivable Nonaccrual Status
Balance	299
Transfer into non-accrual		502
Loans paid down/payoffs		(3)
Loans charged off		(200)
Balance	299	299
SBA Guaranty | Commercial and Industrial
Financing Receivable Nonaccrual Status
Balance		71
Loans paid down/payoffs		(61)
Loans charged off		(10)
Consumer | Consumer Loans
Financing Receivable Nonaccrual Status
Transfer into non-accrual		11
Loans paid down/payoffs		(11)
Automobile | Consumer Loans
Financing Receivable Nonaccrual Status
Balance	85	144
Transfer into non-accrual	175	207
Loans paid down/payoffs	(35)	(105)
Loans returned to accrual status	(19)	(29)
Loans charged off	(124)	(132)
Balance	$ 83	$ 85