Income Taxes - Significant Components of Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred Tax Assets:
Allowance for credit losses and other reserves	$ 21,455	$ 22,953
Net unrealized holding losses on securities available-for-sale	7,509	15,431
Lease liabilities	9,824	10,271
State net operating loss carryforwards	4,105	3,782
Net unrealized losses on interest rate swaps	436	2,063
Cumulative adjustment to funded status of pension	3,495	3,606
Other employee benefits	5,450	4,688
Depreciation on premises and equipment	64	5
Capital loss carryforward	1,125	1,300
Other	1,225	1,243
Deferred Tax Assets	54,688	65,342
Less: Valuation allowance	(4,105)	(3,782)
Total Deferred Tax Assets	50,583	61,560
Deferred Tax Liabilities:
Right-of-use lease assets	(8,323)	(8,825)
Deferred loan income, net	(5,132)	(5,216)
Prepaid pension	(2,780)	(3,131)
Purchase accounting adjustments	(1,477)	(1,650)
Mortgage servicing rights	(122)	(61)
Partnership investments	(354)	(491)
Other	(157)	(113)
Total Deferred Tax liabilities	(18,345)	(19,487)
Net Deferred Tax Asset	$ 32,238	$ 42,073