Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets:
Deferred compensation expense	$ 50,945	$ 51,064
Allowance for credit losses and nonperforming assets	51,492	47,517
Lease liabilities	17,027	17,284
Investment securities	194,213	233,859
State income taxes	2,514	2,619
Total deferred income tax assets before valuation allowance	316,191	352,343
Valuation allowance		(983)
Total deferred income tax assets after valuation allowance	316,191	351,360
Liabilities:
Leases	(13,283)	(15,739)
Deferred income	(12,751)	(20,893)
Lease right-of-use assets	(16,364)	(16,763)
Intangible assets	(948)	(736)
Other	(33,320)	(34,910)
Total deferred income tax liabilities	(76,666)	(89,041)
Net deferred income tax assets	$ 239,525	$ 262,319