Premises and Equipment and Leases - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Cost:
Land	$ 13,369	$ 13,382
Land improvements	1,587	1,326
Buildings	59,167	58,426
Leasehold improvements	3,655	3,616
Furniture, fixtures and equipment	41,075	37,138
Construction in process	315	2,538
Property, Plant and Equipment, Gross	119,168	116,426
Less allowances for depreciation and amortization	(63,566)	(57,761)
Property, Plant and Equipment, Net	$ 55,602	$ 58,665