Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Allowance for credit losses	$ 19,847	$ 48,050
Purchase accounting adjustments—loans	10,264	18,084
Reserves and other accruals	16,444	17,115
Investments	2,038	2,045
Derivatives	4,181	5,009
Employee benefit plans	1,340	2,504
Lease liabilities	33,501	34,955
Unrealized losses on available-for-sale securities	10,642	0
Other	479	821
Total deferred tax assets	98,736	128,583
Deferred tax liabilities:
Unrealized gains on available-for-sale securities	0	(18,997)
Legal settlement	(3,150)	0
Accelerated depreciation	(4,467)	(4,233)
Right of use assets	(30,268)	(31,707)
Deferred loan costs	(230)	(783)
Intangibles	(20,897)	(22,373)
Other	(756)	(1,278)
Total deferred tax liabilities	(59,768)	(79,371)
Net deferred tax asset	$ 38,968	$ 49,212