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Loans and Allowances for Credit Losses, By Aging Category (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing receivable, recorded investment, aging [Abstract] |  |
Current | $ 21,907,461,000 | $ 21,308,989,000
Nonaccrual | 183,779,000 | 163,247,000
Total | 22,255,652,000 | 21,656,730,000
Commercial [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 14,200,479,000 | 13,521,894,000
Nonaccrual | 123,395,000 | 99,841,000
Total | 14,336,908,000 | 13,636,078,000
Commercial [Member] | Energy [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 3,849,711,000 | 3,542,839,000
Nonaccrual | 71,632,000 | 47,494,000
Total | 3,921,353,000 | 3,590,333,000
Commercial [Member] | Services [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 3,297,119,000 | 3,237,578,000
Nonaccrual | 10,087,000 | 8,567,000
Total | 3,309,458,000 | 3,258,192,000
Commercial [Member] | Wholesale/retail [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 1,787,095,000 | 1,619,290,000
Nonaccrual | 1,390,000 | 1,316,000
Total | 1,793,118,000 | 1,621,158,000
Commercial [Member] | Manufacturing [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 750,517,000 | 721,204,000
Nonaccrual | 8,613,000 | 8,919,000
Total | 761,357,000 | 730,521,000
Commercial [Member] | Healthcare [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 2,909,249,000 | 2,781,944,000
Nonaccrual | 16,148,000 | 16,538,000
Total | 2,926,510,000 | 2,799,277,000
Commercial [Member] | Public finance [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 795,659,000 | 804,550,000
Nonaccrual | 0 | 0
Total | 795,659,000 | 804,550,000
Commercial [Member] | Other commercial and industrial [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 811,129,000 | 814,489,000
Nonaccrual | 15,525,000 | 17,007,000
Total | 829,453,000 | 832,047,000
Commercial real estate [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 4,684,818,000 | 4,725,669,000
Nonaccrual | 21,670,000 | 21,621,000
Total | 4,710,033,000 | 4,764,813,000
Commercial real estate [Member] | Residential construction and land development [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 140,555,000 | 147,705,000
Nonaccrual | 350,000 | 350,000
Total | 141,509,000 | 148,584,000
Commercial real estate [Member] | Retail [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 805,342,000 | 884,424,000
Nonaccrual | 20,057,000 | 20,279,000
Total | 825,399,000 | 919,082,000
Commercial real estate [Member] | Office [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 1,055,034,000 | 1,072,920,000
Nonaccrual | 855,000 | 0
Total | 1,056,306,000 | 1,072,920,000
Commercial real estate [Member] | Multifamily [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 1,299,665,000 | 1,287,483,000
Nonaccrual | 275,000 | 301,000
Total | 1,300,372,000 | 1,288,065,000
Commercial real estate [Member] | Industrial [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 827,660,000 | 776,898,000
Nonaccrual | 0 | 0
Total | 828,569,000 | 778,106,000
Commercial real estate [Member] | Other commercial real estate [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 556,562,000 | 556,239,000
Nonaccrual | 133,000 | 691,000
Total | 557,878,000 | 558,056,000
Residential mortgage [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 1,987,119,000 | 2,037,128,000
Nonaccrual | 38,477,000 | 41,555,000
Total | 2,170,822,000 | 2,230,033,000
Residential mortgage [Member] | Permanent mortgage [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 1,062,889,000 | 1,095,097,000
Nonaccrual | 21,803,000 | 23,951,000
Total | 1,088,370,000 | 1,122,610,000
Residential mortgage [Member] | Permanent mortgages guaranteed by US government agencies [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 49,015,000 | 37,459,000
Nonaccrual | 6,743,000 | 7,132,000
Total | 195,373,000 | 190,866,000
Residential mortgage [Member] | Home equity [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 875,215,000 | 904,572,000
Nonaccrual | 9,931,000 | 10,472,000
Total | 887,079,000 | 916,557,000
Personal [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Current | 1,035,045,000 | 1,024,298,000
Nonaccrual | 237,000 | 230,000
Total | 1,037,889,000 | 1,025,806,000
30 to 59 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 38,744,000 | 53,350,000
30 to 59 Days [Member] | Commercial [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 6,626,000 | 7,675,000
30 to 59 Days [Member] | Commercial [Member] | Energy [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 10,000 | 0
30 to 59 Days [Member] | Commercial [Member] | Services [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 1,045,000 | 6,009,000
30 to 59 Days [Member] | Commercial [Member] | Wholesale/retail [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 2,954,000 | 515,000
30 to 59 Days [Member] | Commercial [Member] | Manufacturing [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 197,000 | 392,000
30 to 59 Days [Member] | Commercial [Member] | Healthcare [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 383,000 | 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 | 2,037,000 | 518,000
30 to 59 Days [Member] | Commercial real estate [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 846,000 | 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 | 604,000 | 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 | 131,000 | 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 | 111,000 | 412,000
30 to 59 Days [Member] | Residential mortgage [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 28,763,000 | 28,667,000
30 to 59 Days [Member] | Residential mortgage [Member] | Permanent mortgage [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 3,641,000 | 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 | 23,742,000 | 24,369,000
30 to 59 Days [Member] | Residential mortgage [Member] | Home equity [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 1,380,000 | 1,102,000
30 to 59 Days [Member] | Personal [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 2,509,000 | 479,000
60 to 89 Days [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 28,716,000 | 24,245,000
60 to 89 Days [Member] | Commercial [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 4,349,000 | 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 | 759,000 | 6,038,000
60 to 89 Days [Member] | Commercial [Member] | Wholesale/retail [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 189,000 | 37,000
60 to 89 Days [Member] | Commercial [Member] | Manufacturing [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 2,030,000 | 6,000
60 to 89 Days [Member] | Commercial [Member] | Healthcare [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 609,000 | 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 | 762,000 | 25,000
60 to 89 Days [Member] | Commercial real estate [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 2,107,000 | 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 | 353,000 | 0
60 to 89 Days [Member] | Commercial real estate [Member] | Multifamily [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 301,000 | 0
60 to 89 Days [Member] | Commercial real estate [Member] | Industrial [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 909,000 | 0
60 to 89 Days [Member] | Commercial real estate [Member] | Other commercial real estate [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 544,000 | 0
60 to 89 Days [Member] | Residential mortgage [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 22,172,000 | 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 | 21,619,000 | 16,345,000
60 to 89 Days [Member] | Residential mortgage [Member] | Home equity [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 553,000 | 352,000
60 to 89 Days [Member] | Personal [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 88,000 | 796,000
90 Days or More [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 96,952,000 | 106,899,000
90 Days or More [Member] | Commercial [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 2,059,000 | 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 | 448,000 | 0
90 Days or More [Member] | Commercial [Member] | Wholesale/retail [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 1,490,000 | 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 | 121,000 | 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 | 592,000 | 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 | 64,000 | 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 | 528,000 | 714,000
90 Days or More [Member] | Residential mortgage [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 94,291,000 | 105,620,000
90 Days or More [Member] | Residential mortgage [Member] | Permanent mortgage [Member] |  |
Financing receivable, recorded investment, aging [Abstract] |  |
Past Due | 37,000 | 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 | 94,254,000 | 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 | $ 10,000 | $ 3,000

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