Summary of Significant Accounting Policies - Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) lease	Dec. 31, 2019 USD ($)
Short-term lease expense | $	$ 139	$ 136
Variable lease payments | $	1,100	1,000
Operating lease cost | $	$ 7,725	$ 7,575
Weighted-average remaining lease term-operating leases (Year)	8 years 3 months 18 days	7 years 6 months
Weighted average discount rate-operating leases	3.20%	3.80%
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