Premises and Equipment - Summary of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 58,599	$ 54,302
Less accumulated depreciation	40,486	36,245
Total	18,113	18,057
Land
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	873	873
Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	14,834	14,763
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	2,036	1,953
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	13,551	12,897
Purchased software
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	4,640	4,278
Internally developed software
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 22,665	$ 19,538