Income Taxes - Significant Components of Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Assets:
Allowance for loan losses	$ 23,383	$ 22,083
Net unrealized holding losses on securities available-for-sale	21,843	0
Lease liabilities	10,767	10,876
State net operating loss carryforwards	5,924	5,565
Net unrealized losses on interest rate swaps	4,562	0
Cumulative adjustment to funded status of pension	4,029	3,922
Low income housing partnerships	3,098	3,270
Other employee benefits	3,070	3,433
Other	3,842	3,973
Deferred Tax Assets	80,518	53,122
Less: Valuation allowance	(5,924)	(5,565)
Total Deferred Tax Assets	74,594	47,557
Deferred Tax Liabilities:
Right-of-use lease assets	(9,385)	(9,603)
Deferred loan income	(6,113)	(6,697)
Prepaid pension	(4,084)	(4,566)
Purchase accounting adjustments	(1,853)	(1,954)
Depreciation on premises and equipment	(629)	(1,107)
Net unrealized holding gains on securities available-for-sale	0	(2,004)
Other	(922)	(1,466)
Total Deferred Tax liabilities	(22,986)	(27,397)
Net Deferred Tax Asset	$ 51,608	$ 20,160