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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Financing receivable, recorded investment, aging [Abstract]    
Current $ 21,416,097,000 $ 21,308,989,000
Nonaccrual 152,577,000 163,247,000
Total 21,758,980,000 21,656,730,000
Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 13,838,225,000 13,521,894,000
Nonaccrual 90,358,000 99,841,000
Total 13,961,975,000 13,636,078,000
Commercial [Member] | Energy [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 3,669,767,000 3,542,839,000
Nonaccrual 35,332,000 47,494,000
Total 3,705,099,000 3,590,333,000
Commercial [Member] | Services [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 3,257,230,000 3,237,578,000
Nonaccrual 9,555,000 8,567,000
Total 3,287,563,000 3,258,192,000
Commercial [Member] | Wholesale/retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,704,415,000 1,619,290,000
Nonaccrual 1,425,000 1,316,000
Total 1,706,900,000 1,621,158,000
Commercial [Member] | Manufacturing [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 732,644,000 721,204,000
Nonaccrual 9,548,000 8,919,000
Total 742,374,000 730,521,000
Commercial [Member] | Healthcare [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 2,888,579,000 2,781,944,000
Nonaccrual 18,768,000 16,538,000
Total 2,915,885,000 2,799,277,000
Commercial [Member] | Public finance [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 803,083,000 804,550,000
Nonaccrual 0 0
Total 803,083,000 804,550,000
Commercial [Member] | Other commercial and industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 782,507,000 814,489,000
Nonaccrual 15,730,000 17,007,000
Total 801,071,000 832,047,000
Commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 4,570,995,000 4,725,669,000
Nonaccrual 21,508,000 21,621,000
Total 4,600,651,000 4,764,813,000
Commercial real estate [Member] | Residential construction and land development [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 143,184,000 147,705,000
Nonaccrual 350,000 350,000
Total 149,686,000 148,584,000
Commercial real estate [Member] | Retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 870,526,000 884,424,000
Nonaccrual 20,159,000 20,279,000
Total 890,685,000 919,082,000
Commercial real estate [Member] | Office [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,032,239,000 1,072,920,000
Nonaccrual 855,000 0
Total 1,033,158,000 1,072,920,000
Commercial real estate [Member] | Multifamily [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,209,726,000 1,287,483,000
Nonaccrual 0 301,000
Total 1,210,358,000 1,288,065,000
Commercial real estate [Member] | Industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 767,757,000 776,898,000
Nonaccrual 0 0
Total 767,757,000 778,106,000
Commercial real estate [Member] | Other commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 547,563,000 556,239,000
Nonaccrual 144,000 691,000
Total 549,007,000 558,056,000
Residential mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 2,003,808,000 2,037,128,000
Nonaccrual 40,409,000 41,555,000
Total 2,192,620,000 2,230,033,000
Residential mortgage [Member] | Permanent mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,070,150,000 1,095,097,000
Nonaccrual 22,937,000 23,951,000
Total 1,098,481,000 1,122,610,000
Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 47,639,000 37,459,000
Nonaccrual 6,946,000 7,132,000
Total 193,308,000 190,866,000
Residential mortgage [Member] | Home equity [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 886,019,000 904,572,000
Nonaccrual 10,526,000 10,472,000
Total 900,831,000 916,557,000
Personal [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,003,069,000 1,024,298,000
Nonaccrual 302,000 230,000
Total 1,003,734,000 1,025,806,000
30 to 59 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 87,990,000 53,350,000
30 to 59 Days [Member] | Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 31,761,000 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 20,214,000 6,009,000
30 to 59 Days [Member] | Commercial [Member] | Wholesale/retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 833,000 515,000
30 to 59 Days [Member] | Commercial [Member] | Manufacturing [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 182,000 392,000
30 to 59 Days [Member] | Commercial [Member] | Healthcare [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 7,837,000 241,000
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 2,695,000 518,000
30 to 59 Days [Member] | Commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 7,622,000 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 6,152,000 249,000
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 283,000 281,000
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 1,187,000 412,000
30 to 59 Days [Member] | Residential mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 48,260,000 28,667,000
30 to 59 Days [Member] | Residential mortgage [Member] | Permanent mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 5,394,000 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 38,748,000 24,369,000
30 to 59 Days [Member] | Residential mortgage [Member] | Home equity [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 4,118,000 1,102,000
30 to 59 Days [Member] | Personal [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 347,000 479,000
60 to 89 Days [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 1,731,000 24,245,000
60 to 89 Days [Member] | Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 1,370,000 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 442,000 6,038,000
60 to 89 Days [Member] | Commercial [Member] | Wholesale/retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 227,000 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 701,000 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 0 25,000
60 to 89 Days [Member] | Commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 177,000 280,000
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 64,000 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 113,000 0
60 to 89 Days [Member] | Residential mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 168,000 17,063,000
60 to 89 Days [Member] | Residential mortgage [Member] | Permanent mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 366,000
60 to 89 Days [Member] | Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 16,345,000
60 to 89 Days [Member] | Residential mortgage [Member] | Home equity [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 168,000 352,000
60 to 89 Days [Member] | Personal [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 16,000 796,000
90 Days or More [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 100,585,000 106,899,000
90 Days or More [Member] | Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 261,000 562,000
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 122,000 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 0 554,000
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 139,000 8,000
90 Days or More [Member] | Commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 349,000 714,000
90 Days or More [Member] | Commercial real estate [Member] | Residential construction and land development [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 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 349,000 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 0 714,000
90 Days or More [Member] | Residential mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 99,975,000 105,620,000
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 99,975,000 105,561,000
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 $ 0 $ 3,000