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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Financing receivable, recorded investment, aging [Abstract]    
Current $ 21,938,836,000 $ 21,308,989,000
Nonaccrual 172,466,000 163,247,000
Total 22,285,367,000 21,656,730,000
Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 14,297,027,000 13,521,894,000
Nonaccrual 111,706,000 99,841,000
Total 14,424,625,000 13,636,078,000
Commercial [Member] | Energy [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 4,025,375,000 3,542,839,000
Nonaccrual 88,894,000 47,494,000
Total 4,114,269,000 3,590,333,000
Commercial [Member] | Services [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 3,249,994,000 3,237,578,000
Nonaccrual 6,119,000 8,567,000
Total 3,266,249,000 3,258,192,000
Commercial [Member] | Wholesale/retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,844,203,000 1,619,290,000
Nonaccrual 1,504,000 1,316,000
Total 1,848,617,000 1,621,158,000
Commercial [Member] | Manufacturing [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 687,358,000 721,204,000
Nonaccrual 8,741,000 8,919,000
Total 698,408,000 730,521,000
Commercial [Member] | Healthcare [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 3,026,838,000 2,781,944,000
Nonaccrual 5,978,000 16,538,000
Total 3,032,968,000 2,799,277,000
Commercial [Member] | Public finance [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 744,840,000 804,550,000
Nonaccrual 0 0
Total 744,840,000 804,550,000
Commercial [Member] | Other commercial and industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 718,419,000 814,489,000
Nonaccrual 470,000 17,007,000
Total 719,274,000 832,047,000
Commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 4,595,305,000 4,725,669,000
Nonaccrual 23,185,000 21,621,000
Total 4,626,057,000 4,764,813,000
Commercial real estate [Member] | Residential construction and land development [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 134,947,000 147,705,000
Nonaccrual 350,000 350,000
Total 135,361,000 148,584,000
Commercial real estate [Member] | Retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 779,037,000 884,424,000
Nonaccrual 20,132,000 20,279,000
Total 799,169,000 919,082,000
Commercial real estate [Member] | Office [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,013,420,000 1,072,920,000
Nonaccrual 855,000 0
Total 1,014,275,000 1,072,920,000
Commercial real estate [Member] | Multifamily [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,318,148,000 1,287,483,000
Nonaccrual 286,000 301,000
Total 1,324,839,000 1,288,065,000
Commercial real estate [Member] | Industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 872,627,000 776,898,000
Nonaccrual 909,000 0
Total 873,536,000 778,106,000
Commercial real estate [Member] | Other commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 477,126,000 556,239,000
Nonaccrual 653,000 691,000
Total 478,877,000 558,056,000
Residential mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,929,616,000 2,037,128,000
Nonaccrual 37,304,000 41,555,000
Total 2,117,303,000 2,230,033,000
Residential mortgage [Member] | Permanent mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,036,793,000 1,095,097,000
Nonaccrual 20,165,000 23,951,000
Total 1,066,460,000 1,122,610,000
Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 47,207,000 37,459,000
Nonaccrual 6,332,000 7,132,000
Total 191,764,000 190,866,000
Residential mortgage [Member] | Home equity [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 845,616,000 904,572,000
Nonaccrual 10,807,000 10,472,000
Total 859,079,000 916,557,000
Personal [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,116,888,000 1,024,298,000
Nonaccrual 271,000 230,000
Total 1,117,382,000 1,025,806,000
30 to 59 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 51,586,000 53,350,000
30 to 59 Days [Member] | Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 12,955,000 7,675,000
30 to 59 Days [Member] | Commercial [Member] | Energy [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
30 to 59 Days [Member] | Commercial [Member] | Services [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 7,305,000 6,009,000
30 to 59 Days [Member] | Commercial [Member] | Wholesale/retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 2,910,000 515,000
30 to 59 Days [Member] | Commercial [Member] | Manufacturing [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 2,309,000 392,000
30 to 59 Days [Member] | Commercial [Member] | Healthcare [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 94,000 241,000
30 to 59 Days [Member] | Commercial [Member] | Public finance [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
30 to 59 Days [Member] | Commercial [Member] | Other commercial and industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 337,000 518,000
30 to 59 Days [Member] | Commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 6,740,000 16,529,000
30 to 59 Days [Member] | Commercial real estate [Member] | Residential construction and land development [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 249,000
30 to 59 Days [Member] | Commercial real estate [Member] | Retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 14,379,000
30 to 59 Days [Member] | Commercial real estate [Member] | Office [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
30 to 59 Days [Member] | Commercial real estate [Member] | Multifamily [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 6,405,000 281,000
30 to 59 Days [Member] | Commercial real estate [Member] | Industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 1,208,000
30 to 59 Days [Member] | Commercial real estate [Member] | Other commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 335,000 412,000
30 to 59 Days [Member] | Residential mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 31,791,000 28,667,000
30 to 59 Days [Member] | Residential mortgage [Member] | Permanent mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 6,097,000 3,196,000
30 to 59 Days [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 23,412,000 24,369,000
30 to 59 Days [Member] | Residential mortgage [Member] | Home equity [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 2,282,000 1,102,000
30 to 59 Days [Member] | Personal [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 100,000 479,000
60 to 89 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 27,801,000 24,245,000
60 to 89 Days [Member] | Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 2,146,000 6,106,000
60 to 89 Days [Member] | Commercial [Member] | Energy [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days [Member] | Commercial [Member] | Services [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 2,096,000 6,038,000
60 to 89 Days [Member] | Commercial [Member] | Wholesale/retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 37,000
60 to 89 Days [Member] | Commercial [Member] | Manufacturing [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 6,000
60 to 89 Days [Member] | Commercial [Member] | Healthcare [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 2,000 0
60 to 89 Days [Member] | Commercial [Member] | Public finance [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days [Member] | Commercial [Member] | Other commercial and industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 48,000 25,000
60 to 89 Days [Member] | Commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 106,000 280,000
60 to 89 Days [Member] | Commercial real estate [Member] | Residential construction and land development [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 280,000
60 to 89 Days [Member] | Commercial real estate [Member] | Retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days [Member] | Commercial real estate [Member] | Office [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days [Member] | Commercial real estate [Member] | Multifamily [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days [Member] | Commercial real estate [Member] | Industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days [Member] | Commercial real estate [Member] | Other commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 106,000 0
60 to 89 Days [Member] | Residential mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 25,455,000 17,063,000
60 to 89 Days [Member] | Residential mortgage [Member] | Permanent mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 3,405,000 366,000
60 to 89 Days [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 21,676,000 16,345,000
60 to 89 Days [Member] | Residential mortgage [Member] | Home equity [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 374,000 352,000
60 to 89 Days [Member] | Personal [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 94,000 796,000
90 Days or More [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 94,678,000 106,899,000
90 Days or More [Member] | Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 791,000 562,000
90 Days or More [Member] | Commercial [Member] | Energy [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Commercial [Member] | Services [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 735,000 0
90 Days or More [Member] | Commercial [Member] | Wholesale/retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Commercial [Member] | Manufacturing [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Commercial [Member] | Healthcare [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 56,000 554,000
90 Days or More [Member] | Commercial [Member] | Public finance [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Commercial [Member] | Other commercial and industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 8,000
90 Days or More [Member] | Commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 721,000 714,000
90 Days or More [Member] | Commercial real estate [Member] | Residential construction and land development [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 64,000 0
90 Days or More [Member] | Commercial real estate [Member] | Retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Commercial real estate [Member] | Office [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Commercial real estate [Member] | Multifamily [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Commercial real estate [Member] | Industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Commercial real estate [Member] | Other commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 657,000 714,000
90 Days or More [Member] | Residential mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 93,137,000 105,620,000
90 Days or More [Member] | Residential mortgage [Member] | Permanent mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
90 Days or More [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 93,137,000 105,561,000
90 Days or More [Member] | Residential mortgage [Member] | Home equity [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 59,000
90 Days or More [Member] | Personal [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due $ 29,000 $ 3,000