Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Allowance for credit losses	$ 11,160	$ 13,095
Lease liability	7,277	7,858
Interest income on nonperforming loans	470	500
Compensation and benefits	12,303	11,580
Purchase accounting adjustments	360	0
Liabilities held at fair value	21	20
Deferred loan fees and costs	1,664	1,783
Other	1,017	1,097
Total	34,272	35,933
Deferred tax liabilities:
Prepaid pension	10,875	10,254
Right of use asset	7,092	7,270
Depreciation	3,586	3,735
Intangibles	1,401	1,266
Purchase accounting adjustments	0	5
Leases	1,985	2,425
Other	1,657	1,504
Total deferred tax liabilities	26,596	26,459
Net deferred tax asset at year-end	7,676	9,474	$ 3,776
Net deferred tax asset at beginning of year	9,474	3,776
(Decrease) increase in net deferred tax asset	(1,798)	5,698
CECL accounting standard adoption recorded through equity	0	586
Deferred tax expense	$ 1,798	$ (6,284)	$ 3,073