FHLB Borrowings - FHLB Overdraft Line of Credit and Letters of Credit (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
FHLB Overdraft Line of Credit and Letters of Credit
FHLB line of credit agreement maximum borrowing limit	$ 20,000
FHLB overdraft line of credit average borrowings outstanding		$ 13
FHLB overdraft line of credit outstanding borrowings	$ 0
FHLB overdraft line of credit (as percent)	0.67%		0.43%
FHLB, agreement term	1 year
Standby letter of credit 1 expiring July, 2022
FHLB Overdraft Line of Credit and Letters of Credit
FHLB overdraft line of credit outstanding borrowings	$ 0	$ 0
FHLB letter of credit			$ 11,500
FHLB letter of credit term			16 months
Standby letter of credit 2 expiring July, 2022
FHLB Overdraft Line of Credit and Letters of Credit
FHLB letter of credit			$ 7,500
Standby letters of credit expiring July 2024
FHLB Overdraft Line of Credit and Letters of Credit
FHLB letter of credit			$ 4,000
FHLB letter of credit term			36 months