Allowance for Credit Losses - Off-Balance Sheet Credit Exposures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Liabilities for off-balance sheet credit exposures at beginning of period	$ 1,920	$ 476	$ 748
Provision (credit) for credit loss expense related to off-balance sheet credit exposures	586	1,062	(272)
Liabilities for off-balance sheet credit exposures at end of period	2,506	1,920	476
Cumulative Effect, Adjustment
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Liabilities for off-balance sheet credit exposures at beginning of period	$ 0	382	0
Liabilities for off-balance sheet credit exposures at end of period		$ 0	$ 382