Summary of Significant Accounting Policies - Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) lease	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Short-term lease expense	$ 164	$ 139	$ 136
Variable lease payments	1,100	1,100	1,000
Operating lease cost	$ 8,689	$ 7,725	7,575
Weighted-average remaining lease term-operating leases (Year)	7 years 4 months 24 days	8 years 3 months 18 days
Weighted average discount rate-operating leases	3.10%	3.20%
Minimum [Member]
Term of contract	1 month
Maximum [Member]
Term of contract	15 years
Branches And Office Space [Member]
Number of leases | lease	28
Vehicles [Member]
Number of leases | lease	10
Equipment [Member]
Number of leases | lease	1
Building and Equipment [Member]
Operating lease cost	$ 8,600	$ 7,700	7,600
Other Operation Expenses [Member]
Operating lease cost	$ 100	$ 100	$ 100