Federal and State Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets
Available-for-sale debt securities	$ 102,448	$ 124,533
Allowance for credit losses	56,430	53,074
Employee benefits	12,234	9,465
Operating lease liabilities	9,943	11,093
Deferred compensation	9,144	8,690
Acquisition fair market value adjustments	5,471	3,606
Interest rate swaps	2,356	4,502
Net operating loss carryforwards	567	919
Transferred debt securities	395	1,601
Other	3,951	4,112
Total gross deferred tax assets	202,939	221,595
Deferred tax liabilities
Depreciation of premises and equipment	(21,321)	(17,728)
Deferred loan costs	(10,043)	(10,103)
Operating lease ROU assets	(9,042)	(10,207)
Intangibles	(7,854)	(6,014)
Prepaid assets	(3,146)	(3,098)
Mortgage servicing rights	(2,980)	(3,137)
Debt securities fair value hedge	(2,356)	(4,502)
Other	(7,242)	(7,736)
Total gross deferred tax liabilities	(63,984)	(62,525)
Net deferred tax asset	$ 138,955	$ 159,070