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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing receivable, recorded investment, aging [Abstract]
Current	$ 22,292,878	$ 22,718,498
Total	22,533,847	23,007,520
Past Due 90 Days or More and Accruing	77,404	88,718
30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	67,117	68,013
60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	15,565	38,782
90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	158,287	182,227
Commercial [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	12,598,053	12,978,801
Total	12,657,784	13,077,535
Past Due 90 Days or More and Accruing	145	4,821
Commercial [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	9,503	17,219
Commercial [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	2,051	10,504
Commercial [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	48,177	71,011
Commercial [Member] | Energy [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	3,183,861	3,410,995
Total	3,202,488	3,469,194
Past Due 90 Days or More and Accruing	0	0
Commercial [Member] | Energy [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	12,735
Commercial [Member] | Energy [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	4,050
Commercial [Member] | Energy [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	18,627	41,414
Commercial [Member] | Healthcare [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	3,287,571	3,302,345
Total	3,290,758	3,305,990
Past Due 90 Days or More and Accruing	0	0
Commercial [Member] | Healthcare [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0
Commercial [Member] | Healthcare [Member] | 60 to 89 Days [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	3,187	3,645
Commercial [Member] | Services [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	3,404,154	3,489,423
Total	3,421,948	3,508,583
Past Due 90 Days or More and Accruing	0	326
Commercial [Member] | Services [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	1,791	3,278
Commercial [Member] | Services [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	208	177
Commercial [Member] | Services [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	15,795	15,705
Commercial [Member] | General business [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	2,722,467	2,776,038
Total	2,742,590	2,793,768
Past Due 90 Days or More and Accruing	145	4,495
Commercial [Member] | General business [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	7,712	1,206
Commercial [Member] | General business [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	1,843	6,277
Commercial [Member] | General business [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	10,568	10,247
Commercial real estate [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	4,482,750	4,672,279
Total	4,503,347	4,698,538
Past Due 90 Days or More and Accruing	0	5,126
Commercial real estate [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	134	276
Commercial real estate [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	5,310
Commercial real estate [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	20,463	20,673
Paycheck Protection Program [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	1,848,550	1,682,310
Total	1,848,550	1,682,310
Past Due 90 Days or More and Accruing	0	0
Paycheck Protection Program [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0
Paycheck Protection Program [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0
Paycheck Protection Program [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	0
Loans to individuals [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	3,363,525	3,385,108
Total	3,524,166	3,549,137
Past Due 90 Days or More and Accruing	77,259	78,771
Loans to individuals [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	57,480	50,518
Loans to individuals [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	13,514	22,968
Loans to individuals [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	89,647	90,543
Loans to individuals [Member] | Residential mortgage [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	1,782,825	1,849,304
Total	1,797,478	1,863,003
Past Due 90 Days or More and Accruing	250	181
Loans to individuals [Member] | Residential mortgage [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	7,215	5,812
Loans to individuals [Member] | Residential mortgage [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	415	837
Loans to individuals [Member] | Residential mortgage [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	7,023	7,050
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	274,265	262,102
Total	420,051	408,687
Past Due 90 Days or More and Accruing	77,009	78,349
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	50,175	41,389
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	13,059	22,041
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	82,552	83,155
Loans to individuals [Member] | Personal [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	1,306,435	1,273,702
Total	1,306,637	1,277,447
Past Due 90 Days or More and Accruing	0	241
Loans to individuals [Member] | Personal [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	90	3,317
Loans to individuals [Member] | Personal [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	40	90
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	$ 72	$ 338

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Amount of financing receivable 90 days or more past due and still accruing.

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