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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Financing receivable, recorded investment, aging [Abstract]    
Current $ 21,392,306,000 $ 21,308,989,000
Nonaccrual 180,951,000 163,247,000
Total 21,750,987,000 21,656,730,000
Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 13,899,429,000 13,521,894,000
Nonaccrual 115,416,000 99,841,000
Total 14,031,650,000 13,636,078,000
Commercial [Member] | Energy [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 3,881,244,000 3,542,839,000
Nonaccrual 91,722,000 47,494,000
Total 3,973,377,000 3,590,333,000
Commercial [Member] | Services [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 3,105,621,000 3,237,578,000
Nonaccrual 7,483,000 8,567,000
Total 3,122,163,000 3,258,192,000
Commercial [Member] | Wholesale/retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,758,878,000 1,619,290,000
Nonaccrual 1,163,000 1,316,000
Total 1,760,866,000 1,621,158,000
Commercial [Member] | Manufacturing [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 654,329,000 721,204,000
Nonaccrual 10,133,000 8,919,000
Total 665,449,000 730,521,000
Commercial [Member] | Healthcare [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 3,027,329,000 2,781,944,000
Nonaccrual 4,480,000 16,538,000
Total 3,033,916,000 2,799,277,000
Commercial [Member] | Public finance [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 707,638,000 804,550,000
Nonaccrual 0 0
Total 709,868,000 804,550,000
Commercial [Member] | Other commercial and industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 764,390,000 814,489,000
Nonaccrual 435,000 17,007,000
Total 766,011,000 832,047,000
Commercial Real Estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 4,400,576,000 4,725,669,000
Nonaccrual 27,626,000 21,621,000
Total 4,433,783,000 4,764,813,000
Commercial Real Estate [Member] | Residential construction and land development [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 147,379,000 147,705,000
Nonaccrual 350,000 350,000
Total 150,879,000 148,584,000
Commercial Real Estate [Member] | Retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 756,653,000 884,424,000
Nonaccrual 18,868,000 20,279,000
Total 775,521,000 919,082,000
Commercial Real Estate [Member] | Office [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 928,379,000 1,072,920,000
Nonaccrual 0 0
Total 928,379,000 1,072,920,000
Commercial Real Estate [Member] | Multifamily [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,258,704,000 1,287,483,000
Nonaccrual 6,858,000 301,000
Total 1,265,562,000 1,288,065,000
Commercial Real Estate [Member] | Industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 855,208,000 776,898,000
Nonaccrual 909,000 0
Total 856,117,000 778,106,000
Commercial Real Estate [Member] | Other commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 454,253,000 556,239,000
Nonaccrual 641,000 691,000
Total 457,325,000 558,056,000
Residential Mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,895,939,000 2,037,128,000
Nonaccrual 37,622,000 41,555,000
Total 2,084,172,000 2,230,033,000
Residential Mortgage [Member] | Permanent mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,034,716,000 1,095,097,000
Nonaccrual 20,441,000 23,951,000
Total 1,057,321,000 1,122,610,000
Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 46,898,000 37,459,000
Nonaccrual 6,100,000 7,132,000
Total 197,794,000 190,866,000
Residential Mortgage [Member] | Home equity [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 814,325,000 904,572,000
Nonaccrual 11,081,000 10,472,000
Total 829,057,000 916,557,000
Personal [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Current 1,196,362,000 1,024,298,000
Nonaccrual 287,000 230,000
Total 1,201,382,000 1,025,806,000
30 to 59 Days Past Due [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 47,084,000 53,350,000
30 to 59 Days Past Due [Member] | Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 7,943,000 7,675,000
30 to 59 Days Past Due [Member] | Commercial [Member] | Energy [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 401,000 0
30 to 59 Days Past Due [Member] | Commercial [Member] | Services [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 1,737,000 6,009,000
30 to 59 Days Past Due [Member] | Commercial [Member] | Wholesale/retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 712,000 515,000
30 to 59 Days Past Due [Member] | Commercial [Member] | Manufacturing [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 410,000 392,000
30 to 59 Days Past Due [Member] | Commercial [Member] | Healthcare [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 2,039,000 241,000
30 to 59 Days Past Due [Member] | Commercial [Member] | Public finance [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 2,230,000 0
30 to 59 Days Past Due [Member] | Commercial [Member] | Other commercial and industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 414,000 518,000
30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 4,920,000 16,529,000
30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 3,093,000 249,000
30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] | Retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 14,379,000
30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] | Office [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] | Multifamily [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 281,000
30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] | Industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 1,208,000
30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 1,827,000 412,000
30 to 59 Days Past Due [Member] | Residential Mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 29,557,000 28,667,000
30 to 59 Days Past Due [Member] | Residential Mortgage [Member] | Permanent mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 2,011,000 3,196,000
30 to 59 Days Past Due [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 24,203,000 24,369,000
30 to 59 Days Past Due [Member] | Residential Mortgage [Member] | Home equity [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 3,343,000 1,102,000
30 to 59 Days Past Due [Member] | Personal [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 4,664,000 479,000
60 to 89 Days Past Due [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 20,560,000 24,245,000
60 to 89 Days Past Due [Member] | Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 1,608,000 6,106,000
60 to 89 Days Past Due [Member] | Commercial [Member] | Energy [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 10,000 0
60 to 89 Days Past Due [Member] | Commercial [Member] | Services [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 523,000 6,038,000
60 to 89 Days Past Due [Member] | Commercial [Member] | Wholesale/retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 113,000 37,000
60 to 89 Days Past Due [Member] | Commercial [Member] | Manufacturing [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 190,000 6,000
60 to 89 Days Past Due [Member] | Commercial [Member] | Healthcare [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days Past Due [Member] | Commercial [Member] | Public finance [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days Past Due [Member] | Commercial [Member] | Other commercial and industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 772,000 25,000
60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 250,000 280,000
60 to 89 Days Past Due [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 Past Due [Member] | Commercial Real Estate [Member] | Retail [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] | Office [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] | Multifamily [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] | Industrial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 0 0
60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] | Other commercial real estate [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 250,000 0
60 to 89 Days Past Due [Member] | Residential Mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 18,648,000 17,063,000
60 to 89 Days Past Due [Member] | Residential Mortgage [Member] | Permanent mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 153,000 366,000
60 to 89 Days Past Due [Member] | Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 18,187,000 16,345,000
60 to 89 Days Past Due [Member] | Residential Mortgage [Member] | Home equity [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 308,000 352,000
60 to 89 Days Past Due [Member] | Personal [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 54,000 796,000
90 Days or More [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 110,086,000 106,899,000
90 Days or More [Member] | Commercial [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 7,254,000 562,000
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 6,799,000 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 387,000 0
90 Days or More [Member] | Commercial [Member] | Healthcare [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 68,000 554,000
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 411,000 714,000
90 Days or More [Member] | Commercial Real Estate [Member] | Residential construction and land development [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 57,000 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 354,000 714,000
90 Days or More [Member] | Residential Mortgage [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 102,406,000 105,620,000
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 U.S. government agencies [Member]    
Financing receivable, recorded investment, aging [Abstract]    
Past Due 102,406,000 105,561,000
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 $ 15,000 $ 3,000