Borrowed Funds and Mandatorily Redeemable Securities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) note	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Borrowed funds and mandatorily redeemable securities
Total long-term debt and mandatorily redeemable securities	$ 47,911	$ 46,555
Annual maturities of long-term debt
2024	12,450
2025	1,410
2026	11,290
2027	830
2028	200
Thereafter	21,730
Mandatorily redeemable securities
Interest expense	3,600	(350)	$ 1,790
Asset pledged as collateral
Borrowed funds and mandatorily redeemable securities
Collateralized securities for Federal Home Loan Bank borrowings	29,670
Securities subject to mandatory redemption
Borrowed funds and mandatorily redeemable securities
Mandatorily redeemable securities	21,641	17,905
Federal Home Loan Bank borrowings
Borrowed funds and mandatorily redeemable securities
Long-term debt	$ 20,753	21,315
Annual maturities of long-term debt
Number of Federal Home Loan Bank borrowings, fixed rate notes | note	5
Other long-term debt
Borrowed funds and mandatorily redeemable securities
Long-term debt	$ 5,517	$ 7,335
Minimum | Federal Home Loan Bank borrowings
Borrowed funds and mandatorily redeemable securities
Interest rate on Federal Home Loan Bank borrowings (as a percent)	1.04%
Maximum | Federal Home Loan Bank borrowings
Borrowed funds and mandatorily redeemable securities
Interest rate on Federal Home Loan Bank borrowings (as a percent)	2.80%