Loans - Off-Balance Sheet Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of period	$ 1,570	$ 1,264	$ 1,815
Off-Balance Sheet - CECL Adoption				$ 553
Off-Balance Sheet- Provision (Benefit)	(259)	295	(504)	1,006
Balance at end of period	1,311	$ 1,559	1,311	$ 1,559
Extension Of Credit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Commitment to extend credit	$ 445,900		$ 445,900		$ 474,000