Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets:
Deferred compensation expense	$ 58,497	$ 57,727
Allowance for credit losses and nonperforming assets	50,161	63,899
Lease liabilities	17,534	10,839
Investment securities	40,108
State income taxes	3,440	4,243
Total deferred income tax assets before valuation allowance	169,740	136,708
Valuation allowance	(1,082)	(1,675)
Total deferred income tax assets after valuation allowance	168,658	135,033
Liabilities:
Leases	(15,785)	(18,583)
Investment securities		(19,965)
Deferred income	(14,213)	(11,399)
Lease right-of-use assets	(17,132)	(10,736)
Intangible assets	(577)	(604)
Other	(24,779)	(19,222)
Total deferred income tax liabilities	(72,486)	(80,509)
Net deferred income tax assets	$ 96,172	$ 54,524