Federal and State Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets
Available-for-sale debt securities	$ 157,381	$ 1,156
Allowance for credit losses	52,445	49,375
Operating lease liabilities	11,871	12,103
Employee benefits	11,024	10,868
Deferred compensation	8,211	8,002
Acquisition fair market value adjustments	4,932	6,891
Transferred debt securities	3,017	0
Net operating loss carryforwards	1,253	1,569
Other	2,376	2,787
Total gross deferred tax assets	252,510	92,751
Deferred tax liabilities
Depreciation of premises and equipment	(17,091)	(15,749)
Operating lease ROU assets	(11,004)	(11,293)
Deferred loan costs	(10,083)	(9,264)
Intangibles	(8,212)	(9,760)
Mortgage servicing rights	(3,408)	(3,244)
Transferred debt securities	0	(10,299)
Other	(9,525)	(5,449)
Total gross deferred tax liabilities	(59,323)	(65,058)
Net deferred tax asset	$ 193,187	$ 27,693