Income Taxes - Components of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Unrealized loss on available for sale securities	$ 193,134	$ 254,502
Allowance for loan losses	45,189	43,686
Cash flow hedges	12,302	18,192
Leases	15,664	14,858
Charitable contribution limitation carryover	4,844	12,273
Investment losses	7,339	7,918
Accrued expenses	10,042	5,426
Fixed assets	4,142	4,287
Loan basis difference fair value adjustments	3,455	4,009
Employee benefits	0	354
PPP loans fee income	0	58
Other	2,061	2,083
Total deferred tax assets	298,172	367,646
Deferred tax liabilities:
Amortization of intangibles	9,660	16,439
Lease obligation	14,284	13,933
Partnerships	1,971	2,340
Trading securities	3,405	938
Employee benefits	824	0
Other	1,843	2,033
Total deferred tax liabilities	31,987	35,683
Net deferred income tax assets	$ 266,185	$ 331,963