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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