Loans and Allowance for Credit Losses - Loans - Non-accrual loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable Nonaccrual Status
Balance	$ 527	$ 488
Transfer into nonaccrual	285	482
Loans paid down/payoffs	(99)	(301)
Loans returned to accrual status	(1)	(18)
Loans charged off	(352)	(124)
Balance	360	527
Real Estate Loan
Financing Receivable Nonaccrual Status
Balance	145
Balance	273	145
Real Estate Loan | Single-family Residential
Financing Receivable Nonaccrual Status
Balance	145	104
Transfer into nonaccrual	52	307
Loans paid down/payoffs	(48)	(266)
Balance	149	145
Real Estate Loan | Commercial
Financing Receivable Nonaccrual Status
Transfer into nonaccrual	140
Loans paid down/payoffs	(16)
Balance	124
Commercial and Industrial
Financing Receivable Nonaccrual Status
Balance	299
Balance		299
Commercial and Industrial | Commercial and Industrial
Financing Receivable Nonaccrual Status
Balance	299	299
Loans charged off	(299)
Balance		299
Consumer Loans
Financing Receivable Nonaccrual Status
Balance	83
Balance	87	83
Consumer Loans | Automobile
Financing Receivable Nonaccrual Status
Balance	83	85
Transfer into nonaccrual	93	175
Loans paid down/payoffs	(35)	(35)
Loans returned to accrual status	(1)	(18)
Loans charged off	(53)	(124)
Balance	$ 87	$ 83