Premises and Equipment - Summary of Premises and Equipment and Applicable Depreciable Lives (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Premises and equipment, gross	$ 51,980	$ 51,736
Less accumulated depreciation	(23,774)	(22,570)
Premises and equipment, net	28,206	29,166
Construction in progress		50
Total premises and equipment, net	28,206	29,216
Land [Member]
Property Plant And Equipment [Line Items]
Premises and equipment, gross	6,269	6,407
Premises [Member]
Property Plant And Equipment [Line Items]
Premises and equipment, gross	28,575	28,387
Furniture, Fixtures and Equipment [Member]
Property Plant And Equipment [Line Items]
Premises and equipment, gross	$ 17,136	$ 16,942