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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing receivable, recorded investment, aging [Abstract]
Current	$ 21,197,351	$ 22,718,498
Total	21,416,449	23,007,520
Past Due 90 Days or More and Accruing	89,373	88,718
30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	49,166	68,013
60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	19,701	38,782
90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	150,231	182,227
Commercial [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	12,434,416	12,978,801
Total	12,472,907	13,077,535
Past Due 90 Days or More and Accruing	212	4,821
Commercial [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	1,251	17,219
Commercial [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	469	10,504
Commercial [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	36,771	71,011
Commercial [Member] | Energy [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	2,993,105	3,410,995
Total	3,011,331	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	18,226	41,414
Commercial [Member] | Healthcare [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	3,380,557	3,302,345
Total	3,381,261	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	177	0
Commercial [Member] | Healthcare [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	527	3,645
Commercial [Member] | Services [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	3,377,109	3,489,423
Total	3,389,756	3,508,583
Past Due 90 Days or More and Accruing	212	326
Commercial [Member] | Services [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	336	3,278
Commercial [Member] | Services [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	0	177
Commercial [Member] | Services [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	12,311	15,705
Commercial [Member] | General business [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	2,683,645	2,776,038
Total	2,690,559	2,793,768
Past Due 90 Days or More and Accruing	0	4,495
Commercial [Member] | General business [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	915	1,206
Commercial [Member] | General business [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	292	6,277
Commercial [Member] | General business [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	5,707	10,247
Commercial real estate [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	4,236,417	4,672,279
Total	4,246,992	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	1,604	276
Commercial real estate [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	39	5,310
Commercial real estate [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	8,932	20,673
Paycheck Protection Program [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	1,121,583	1,682,310
Total	1,121,583	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	3,404,935	3,385,108
Total	3,574,967	3,549,137
Past Due 90 Days or More and Accruing	89,161	78,771
Loans to individuals [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	46,311	50,518
Loans to individuals [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	19,193	22,968
Loans to individuals [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	104,528	90,543
Loans to individuals [Member] | Residential mortgage [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	1,757,711	1,849,304
Total	1,772,627	1,863,003
Past Due 90 Days or More and Accruing	0	181
Loans to individuals [Member] | Residential mortgage [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	4,780	5,812
Loans to individuals [Member] | Residential mortgage [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	898	837
Loans to individuals [Member] | Residential mortgage [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	9,238	7,050
Loans to individuals [Member] | Residential mortgage [Member] | US Government Agency Insured Loans [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	259,023	262,102
Total	413,806	408,687
Past Due 90 Days or More and Accruing	89,121	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	41,355	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	18,265	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	95,163	83,155
Loans to individuals [Member] | Personal [Member]
Financing receivable, recorded investment, aging [Abstract]
Current	1,388,201	1,273,702
Total	1,388,534	1,277,447
Past Due 90 Days or More and Accruing	40	241
Loans to individuals [Member] | Personal [Member] | 30 to 59 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	176	3,317
Loans to individuals [Member] | Personal [Member] | 60 to 89 Days [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	30	90
Loans to individuals [Member] | Personal [Member] | 90 Days or More [Member]
Financing receivable, recorded investment, aging [Abstract]
Past Due	$ 127	$ 338

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

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