Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Allowance for loan losses [Roll Forward]
Beginning balance	$ 256,421	$ 388,640	$ 236,568
Provision for loan losses	428	(95,202)	222,460
Loans charged off	(28,746)	(51,351)	(79,399)
Recoveries of loans previously charged off	7,601	14,334	9,011
Ending balance	235,704	256,421	388,640
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance	32,977	36,921	25,137
Provision for off-balance sheet credit risk	27,942	(3,944)	11,784
Ending Balance	60,919	32,977	36,921
Total provision for credit losses	30,000	(100,000)	222,592
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	22,435,353	20,071,621
Individually measured for impairment, recorded investment	121,797	134,059
Total	22,557,150	20,205,680
Related allowance [Abstract]
Collectively measured for impairment, related allowance	230,134	250,079
Individually measured for impairment, related allowance	5,570	6,342
Total	235,704	256,421
Commercial [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	162,056	254,934	151,868
Provision for loan losses	(12,782)	(59,326)	171,800
Loans charged off	(22,382)	(43,956)	(73,370)
Recoveries of loans previously charged off	4,694	10,404	4,636
Ending balance	131,586	162,056	254,934
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance	13,812	14,422	11,578
Provision for off-balance sheet credit risk	4,434	(610)	2,844
Ending Balance	18,246	13,812	14,422
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	14,137,890	12,432,361
Individually measured for impairment, recorded investment	60,297	74,104
Total	14,198,187	12,506,465
Related allowance [Abstract]
Collectively measured for impairment, related allowance	127,566	158,063
Individually measured for impairment, related allowance	4,020	3,993
Total	131,586	162,056
Commercial real estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	58,553	86,558	47,185
Provision for loan losses	(813)	(26,522)	40,407
Loans charged off	(269)	(2,485)	(1,300)
Recoveries of loans previously charged off	177	1,002	266
Ending balance	57,648	58,553	86,558
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance	17,442	20,571	11,767
Provision for off-balance sheet credit risk	23,048	(3,129)	8,804
Ending Balance	40,490	17,442	20,571
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	4,590,207	3,817,063
Individually measured for impairment, recorded investment	16,570	14,262
Total	4,606,777	3,831,325
Related allowance [Abstract]
Collectively measured for impairment, related allowance	56,098	56,204
Individually measured for impairment, related allowance	1,550	2,349
Total	57,648	58,553
Paycheck Protection Program
Allowance for loan losses [Roll Forward]
Beginning balance	0	0	0
Provision for loan losses	0	0	0
Loans charged off	0	0	0
Recoveries of loans previously charged off	0	0	0
Ending balance	0	0	0
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance	0	0	0
Provision for off-balance sheet credit risk	0	0	0
Ending Balance	0	0	0
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	14,312	276,341
Individually measured for impairment, recorded investment	0	0
Total	14,312	276,341
Related allowance [Abstract]
Collectively measured for impairment, related allowance	0	0
Individually measured for impairment, related allowance	0	0
Total	0	0
Loans to individuals [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	35,812	47,148	37,515
Provision for loan losses	14,023	(9,354)	10,253
Loans charged off	(6,095)	(4,910)	(4,729)
Recoveries of loans previously charged off	2,730	2,928	4,109
Ending balance	46,470	35,812	47,148
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance	1,723	1,928	1,792
Provision for off-balance sheet credit risk	460	(205)	136
Ending Balance	2,183	1,723	1,928
Recorded investment [Abstract]
Collectively measured for impairment, recorded investment	3,692,944	3,545,856
Individually measured for impairment, recorded investment	44,930	45,693
Total	3,737,874	3,591,549
Related allowance [Abstract]
Collectively measured for impairment, related allowance	46,470	35,812
Individually measured for impairment, related allowance	0	0
Total	46,470	35,812
Nonspecific Allowance [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	0	0	0
Provision for loan losses	0	0	0
Loans charged off	0	0	0
Recoveries of loans previously charged off	0	0	0
Ending balance	0	0	0
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance	0	0	0
Provision for off-balance sheet credit risk	0	0	0
Ending Balance	$ 0	$ 0	0
Transition Adjustment [Member]
Allowance for loan losses [Roll Forward]
Beginning balance			25,809
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance			23,552
Transition Adjustment [Member] | Commercial [Member]
Allowance for loan losses [Roll Forward]
Beginning balance			33,681
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance			10,144
Transition Adjustment [Member] | Commercial real estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance			(4,620)
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance			11,660
Transition Adjustment [Member] | Paycheck Protection Program
Allowance for loan losses [Roll Forward]
Beginning balance			0
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance			0
Transition Adjustment [Member] | Loans to individuals [Member]
Allowance for loan losses [Roll Forward]
Beginning balance			13,943
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance			1,748
Transition Adjustment [Member] | Nonspecific Allowance [Member]
Allowance for loan losses [Roll Forward]
Beginning balance			(17,195)
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance			0
Previously Reported [Member]
Allowance for loan losses [Roll Forward]
Beginning balance			210,759
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance			1,585
Previously Reported [Member] | Commercial [Member]
Allowance for loan losses [Roll Forward]
Beginning balance			118,187
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance			1,434
Previously Reported [Member] | Commercial real estate [Member]
Allowance for loan losses [Roll Forward]
Beginning balance			51,805
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance			107
Previously Reported [Member] | Paycheck Protection Program
Allowance for loan losses [Roll Forward]
Beginning balance			0
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance			0
Previously Reported [Member] | Loans to individuals [Member]
Allowance for loan losses [Roll Forward]
Beginning balance			23,572
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance			44
Previously Reported [Member] | Nonspecific Allowance [Member]
Allowance for loan losses [Roll Forward]
Beginning balance			17,195
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning Balance			$ 0