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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing receivable, recorded investment, aging [Abstract]
Current	$ 22,718,498	$ 21,392,306
Nonaccrual	234,693	180,951
Total	23,007,520	21,750,987
Past Due 90 Days or More and Accruing	88,718	7,680
30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	68,013	47,084
60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	38,782	20,560
90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	182,227	110,086
Commercial [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	12,978,801	13,899,429
Nonaccrual	167,159	115,416
Total	13,077,535	14,031,650
Past Due 90 Days or More and Accruing	4,821
Commercial [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	17,219	7,943
Commercial [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	10,504	1,608
Commercial [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	71,011	7,254
Commercial [Member] | Energy [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	3,410,995	3,881,244
Nonaccrual	125,059	91,722
Total	3,469,194	3,973,377
Past Due 90 Days or More and Accruing	0
Commercial [Member] | Energy [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	12,735	401
Commercial [Member] | Energy [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	4,050	10
Commercial [Member] | Energy [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	41,414	0
Commercial [Member] | Healthcare [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	3,302,345	3,027,329
Nonaccrual	3,645	4,480
Total	3,305,990	3,033,916
Past Due 90 Days or More and Accruing	0
Commercial [Member] | Healthcare [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	2,039
Commercial [Member] | Healthcare [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0
Commercial [Member] | Healthcare [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	3,645	68
Commercial [Member] | Services [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	3,489,423	3,105,621
Nonaccrual	25,598	7,483
Total	3,508,583	3,122,163
Past Due 90 Days or More and Accruing	326
Commercial [Member] | Services [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	3,278	1,737
Commercial [Member] | Services [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	177	523
Commercial [Member] | Services [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	15,705	6,799
Commercial [Member] | Wholesale/retail [Member]
Financing receivable, recorded investment, aging [Abstract]
Current		1,758,878
Nonaccrual		1,163
Total		1,760,866
Commercial [Member] | Wholesale/retail [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		712
Commercial [Member] | Wholesale/retail [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		113
Commercial [Member] | Wholesale/retail [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial [Member] | General business [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	2,776,038
Nonaccrual	12,857
Total	2,793,768
Past Due 90 Days or More and Accruing	4,495
Commercial [Member] | General business [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	1,206
Commercial [Member] | General business [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	6,277
Commercial [Member] | General business [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	10,247
Commercial [Member] | Manufacturing [Member]
Financing receivable, recorded investment, aging [Abstract]
Current		654,329
Nonaccrual		10,133
Total		665,449
Commercial [Member] | Manufacturing [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		410
Commercial [Member] | Manufacturing [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		190
Commercial [Member] | Manufacturing [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		387
Commercial [Member] | Public finance [Member]
Financing receivable, recorded investment, aging [Abstract]
Current		707,638
Nonaccrual		0
Total		709,868
Commercial [Member] | Public finance [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		2,230
Commercial [Member] | Public finance [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial [Member] | Public finance [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial [Member] | Other commercial and industrial [Member]
Financing receivable, recorded investment, aging [Abstract]
Current		764,390
Nonaccrual		435
Total		766,011
Commercial [Member] | Other commercial and industrial [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		414
Commercial [Member] | Other commercial and industrial [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		772
Commercial [Member] | Other commercial and industrial [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial real estate [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	4,672,279	4,400,576
Nonaccrual	27,246	27,626
Total	4,698,538	4,433,783
Past Due 90 Days or More and Accruing	5,126
Commercial real estate [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	276	4,920
Commercial real estate [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	5,310	250
Commercial real estate [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	20,673	411
Commercial real estate [Member] | Residential construction and land development [Member]
Financing receivable, recorded investment, aging [Abstract]
Current		147,379
Nonaccrual		350
Total		150,879
Commercial real estate [Member] | Residential construction and land development [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		3,093
Commercial real estate [Member] | Residential construction and land development [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial real estate [Member] | Residential construction and land development [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		57
Commercial real estate [Member] | Retail [Member]
Financing receivable, recorded investment, aging [Abstract]
Current		756,653
Nonaccrual		18,868
Total		775,521
Commercial real estate [Member] | Retail [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial real estate [Member] | Retail [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial real estate [Member] | Retail [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial real estate [Member] | Office [Member]
Financing receivable, recorded investment, aging [Abstract]
Current		928,379
Nonaccrual		0
Total		928,379
Commercial real estate [Member] | Office [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial real estate [Member] | Office [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial real estate [Member] | Office [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial real estate [Member] | Multifamily [Member]
Financing receivable, recorded investment, aging [Abstract]
Current		1,258,704
Nonaccrual		6,858
Total		1,265,562
Commercial real estate [Member] | Multifamily [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial real estate [Member] | Multifamily [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial real estate [Member] | Multifamily [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial real estate [Member] | Industrial [Member]
Financing receivable, recorded investment, aging [Abstract]
Current		855,208
Nonaccrual		909
Total		856,117
Commercial real estate [Member] | Industrial [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial real estate [Member] | Industrial [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial real estate [Member] | Industrial [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Commercial real estate [Member] | Other commercial real estate [Member]
Financing receivable, recorded investment, aging [Abstract]
Current		454,253
Nonaccrual		641
Total		457,325
Commercial real estate [Member] | Other commercial real estate [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		1,827
Commercial real estate [Member] | Other commercial real estate [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		250
Commercial real estate [Member] | Other commercial real estate [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		354
Loans to individuals [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	3,385,108
Nonaccrual	40,288
Total	3,549,137
Past Due 90 Days or More and Accruing	78,771
Loans to individuals [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	50,518
Loans to individuals [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	22,968
Loans to individuals [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	90,543
Loans to individuals [Member] | Residential mortgage [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	1,849,304
Nonaccrual	32,228
Total	1,863,003
Past Due 90 Days or More and Accruing	181
Loans to individuals [Member] | Residential mortgage [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	5,812
Loans to individuals [Member] | Residential mortgage [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	837
Loans to individuals [Member] | Residential mortgage [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	7,050
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans
Financing receivable, recorded investment, aging [Abstract]
Current	262,102
Nonaccrual	7,741
Total	408,687
Past Due 90 Days or More and Accruing	78,349
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	41,389
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	22,041
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	83,155
Loans to individuals [Member] | Permanent residential mortgage [Member]
Financing receivable, recorded investment, aging [Abstract]
Current		1,034,716
Nonaccrual		20,441
Total		1,057,321
Loans to individuals [Member] | Permanent residential mortgage [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		2,011
Loans to individuals [Member] | Permanent residential mortgage [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		153
Loans to individuals [Member] | Permanent residential mortgage [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Loans to individuals [Member] | Permanent residential mortgage [Member] | US Government Agency Insured Loans
Financing receivable, recorded investment, aging [Abstract]
Nonaccrual		6,100
Loans to individuals [Member] | Home equity [Member]
Financing receivable, recorded investment, aging [Abstract]
Current		814,325
Nonaccrual		11,081
Total		829,057
Loans to individuals [Member] | Home equity [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		3,343
Loans to individuals [Member] | Home equity [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		308
Loans to individuals [Member] | Home equity [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		0
Loans to individuals [Member] | Personal [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	1,273,702	1,196,362
Nonaccrual	319	287
Total	1,277,447	1,201,382
Past Due 90 Days or More and Accruing	241
Loans to individuals [Member] | Personal [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	3,317	4,664
Loans to individuals [Member] | Personal [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	90	54
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	338	15
Loans to individuals [Member] | Residential Mortgage [Member]
Financing receivable, recorded investment, aging [Abstract]
Current		1,895,939
Nonaccrual		37,622
Total		2,084,172
Loans to individuals [Member] | Residential Mortgage [Member] | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		29,557
Loans to individuals [Member] | Residential Mortgage [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		18,648
Loans to individuals [Member] | Residential Mortgage [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		102,406
Loans to individuals [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] | US Government Agency Insured Loans
Financing receivable, recorded investment, aging [Abstract]
Current		46,898
Total		197,794
Loans to individuals [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] | US Government Agency Insured Loans | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		24,203
Loans to individuals [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] | US Government Agency Insured Loans | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		18,187
Loans to individuals [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] | US Government Agency Insured Loans | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due		$ 102,406
Paycheck Protection Program
Financing receivable, recorded investment, aging [Abstract]
Current	1,682,310
Total	1,682,310
Past Due 90 Days or More and Accruing	0
Paycheck Protection Program | 30 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0
Paycheck Protection Program | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0
Paycheck Protection Program | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	$ 0

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