Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets [Abstract]
Litigation losses	$ 26,647	$ 25,187
Other real estate	1,743	70
Accumulated credit losses	43,473	39,370
Deferred compensation	17,893	17,695
Finance and operating lease liabilities	11,426	10,997
Realized built-in losses	8,429	9,180
Securities	68,223	84,813
Pension and other postretirement benefit plans	2,025	1,931
Interest on nonaccrual loans	1,218	1,159
LHFS	777	205
Stock-based compensation	3,196	2,647
Derivatives	2,993	5,056
Other	10,543	10,038
Gross deferred tax asset	198,586	208,348
Deferred tax liabilities [Abstract]
Goodwill and other identifiable intangibles	14,297	14,378
Premises and equipment	17,382	15,978
Finance and operating lease right-of-use assets	10,420	10,209
MSR	26,271	24,452
Securities	3,181	2,069
Other	2,264	2,876
Gross deferred tax liability	73,815	69,962
Net deferred tax asset	$ 124,771	$ 138,386