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Loans Past Due Status (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Summarized details of Loans    
Current $ 22,679,140,000 $ 20,555,250,000
Nonaccrual 154,092,000 208,546,000
Total loans 22,867,112,000 20,784,991,000
Nonaccrual Loans, Current Portion $ 92,000,000 $ 135,000,000
Percent of current nonaccrual loans 60.00% 65.00%
30-59 Days Past Due    
Summarized details of Loans    
Total Past Due $ 28,138,000 $ 16,861,000
60-89 Days Past Due    
Summarized details of Loans    
Total Past Due 3,568,000 2,467,000
90 Days or More Past Due    
Summarized details of Loans    
Total Past Due 2,175,000 1,867,000
Commercial and industrial    
Summarized details of Loans    
Current 7,103,744,000 6,286,369,000
Nonaccrual 50,146,000 112,786,000
Total loans 7,159,941,000 6,399,693,000
Commercial and industrial | 30-59 Days Past Due    
Summarized details of Loans    
Total Past Due 5,592,000 170,000
Commercial and industrial | 60-89 Days Past Due    
Summarized details of Loans    
Total Past Due 140,000 101,000
Commercial and industrial | 90 Days or More Past Due    
Summarized details of Loans    
Total Past Due 319,000 267,000
Commercial real estate — owner occupied    
Summarized details of Loans    
Current 856,777,000 779,421,000
Nonaccrual 4,779,000 22,740,000
Total loans 867,682,000 802,209,000
Commercial real estate — owner occupied | 30-59 Days Past Due    
Summarized details of Loans    
Total Past Due 5,589,000 48,000
Commercial real estate — owner occupied | 60-89 Days Past Due    
Summarized details of Loans    
Total Past Due 537,000 0
Commercial real estate — owner occupied | 90 Days or More Past Due    
Summarized details of Loans    
Total Past Due 0 0
Commercial and business lending    
Summarized details of Loans    
Current 7,960,521,000 7,065,790,000
Nonaccrual 54,925,000 135,526,000
Total loans 8,027,622,000 7,201,902,000
Commercial and business lending | 30-59 Days Past Due    
Summarized details of Loans    
Total Past Due 11,181,000 218,000
Commercial and business lending | 60-89 Days Past Due    
Summarized details of Loans    
Total Past Due 677,000 101,000
Commercial and business lending | 90 Days or More Past Due    
Summarized details of Loans    
Total Past Due 319,000 267,000
Commercial real estate — investor    
Summarized details of Loans    
Current 3,904,401,000 3,310,000,000
Nonaccrual 19,725,000 4,729,000
Total loans 3,924,499,000 3,315,254,000
Commercial real estate — investor | 30-59 Days Past Due    
Summarized details of Loans    
Total Past Due 373,000 374,000
Commercial real estate — investor | 60-89 Days Past Due    
Summarized details of Loans    
Total Past Due 0 0
Commercial real estate — investor | 90 Days or More Past Due    
Summarized details of Loans    
Total Past Due 0 151,000
Real estate construction    
Summarized details of Loans    
Current 1,414,538,000 1,450,459,000
Nonaccrual 1,154,000 974,000
Total loans 1,416,209,000 1,451,684,000
Real estate construction | 30-59 Days Past Due    
Summarized details of Loans    
Total Past Due 517,000 168,000
Real estate construction | 60-89 Days Past Due    
Summarized details of Loans    
Total Past Due 0 83,000
Real estate construction | 90 Days or More Past Due    
Summarized details of Loans    
Total Past Due 0 0
Commercial real estate lending    
Summarized details of Loans    
Current 5,318,939,000 4,760,459,000
Nonaccrual 20,879,000 5,703,000
Total loans 5,340,708,000 4,766,938,000
Commercial real estate lending | 30-59 Days Past Due    
Summarized details of Loans    
Total Past Due 890,000 542,000
Commercial real estate lending | 60-89 Days Past Due    
Summarized details of Loans    
Total Past Due 0 83,000
Commercial real estate lending | 90 Days or More Past Due    
Summarized details of Loans    
Total Past Due 0 151,000
Total commercial    
Summarized details of Loans    
Current 13,279,460,000 11,826,249,000
Nonaccrual 75,804,000 141,229,000
Total loans 13,368,330,000 11,968,840,000
Total commercial | 30-59 Days Past Due    
Summarized details of Loans    
Total Past Due 12,071,000 760,000
Total commercial | 60-89 Days Past Due    
Summarized details of Loans    
Total Past Due 677,000 184,000
Total commercial | 90 Days or More Past Due    
Summarized details of Loans    
Total Past Due 319,000 418,000
Residential mortgage    
Summarized details of Loans    
Current 8,152,854,000 7,483,350,000
Nonaccrual 65,896,000 53,632,000
Total loans 8,227,649,000 7,546,534,000
Residential mortgage | 30-59 Days Past Due    
Summarized details of Loans    
Total Past Due 7,829,000 9,186,000
Residential mortgage | 60-89 Days Past Due    
Summarized details of Loans    
Total Past Due 1,070,000 366,000
Residential mortgage | 90 Days or More Past Due    
Summarized details of Loans    
Total Past Due 0 0
Home equity    
Summarized details of Loans    
Current 880,871,000 863,465,000
Nonaccrual 12,324,000 13,514,000
Total loans 901,275,000 883,804,000
Home equity | 30-59 Days Past Due    
Summarized details of Loans    
Total Past Due 6,989,000 5,688,000
Home equity | 60-89 Days Past Due    
Summarized details of Loans    
Total Past Due 1,091,000 1,137,000
Home equity | 90 Days or More Past Due    
Summarized details of Loans    
Total Past Due 0 0
Other consumer    
Summarized details of Loans    
Current 365,955,000 382,186,000
Nonaccrual 68,000 171,000
Total loans 369,858,000 385,813,000
Other consumer | 30-59 Days Past Due    
Summarized details of Loans    
Total Past Due 1,249,000 1,227,000
Other consumer | 60-89 Days Past Due    
Summarized details of Loans    
Total Past Due 730,000 780,000
Other consumer | 90 Days or More Past Due    
Summarized details of Loans    
Total Past Due 1,856,000 1,449,000
Total consumer    
Summarized details of Loans    
Current 9,399,680,000 8,729,001,000
Nonaccrual 78,288,000 67,317,000
Total loans 9,498,782,000 8,816,151,000
Total consumer | 30-59 Days Past Due    
Summarized details of Loans    
Total Past Due 16,067,000 16,101,000
Total consumer | 60-89 Days Past Due    
Summarized details of Loans    
Total Past Due 2,891,000 2,283,000
Total consumer | 90 Days or More Past Due    
Summarized details of Loans    
Total Past Due $ 1,856,000 $ 1,449,000