Premises and Equipment - Additional information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Initial Leases And Lease Modifications And Renewals			$ 9,500,000
Operating Lease Right Of Use Assets	$ 7,715,000	$ 8,536,000
Lease liability	$ 7,886,000	8,661,000
Weighted-average lease term	9 years 3 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	3.44%
Operating Lease, Expense	$ 1,500,000	1,600,000	1,500,000
Lease expense related to ATMs	307,000	275,000	286,000
Income Recognized From Lessor Agreements	$ 1,200,000	$ 1,200,000	$ 1,100,000
Minimum
Expected lease terms	1 year 3 months 18 days
Maximum
Expected lease terms	16 years 10 months 24 days