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Loans and Allowance for Credit Losses Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross $ 16,289,939 $ 16,192,439
Real-estate - commercial mortgage    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 6,428,688 6,434,285
Real-estate - commercial mortgage | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 6,123,827 6,129,463
Real-estate - commercial mortgage | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 158,447 170,827
Real-estate - commercial mortgage | 43465    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 146,414 133,995
Commercial    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 4,259,374 4,224,980
Commercial | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 3,920,866 3,902,484
Commercial | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 191,025 193,470
Commercial | 43465    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 147,483 129,026
Commercial - unsecured    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 170,164 179,568
Commercial - unsecured | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 162,883 171,589
Commercial - unsecured | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 4,290 4,016
Commercial - unsecured | 43465    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 2,991 3,963
Commercial - industrial, financial and agricultural    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 4,429,538 4,404,548
Commercial - industrial, financial and agricultural | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 4,083,749 4,074,073
Commercial - industrial, financial and agricultural | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 195,315 197,486
Commercial - industrial, financial and agricultural | 43465    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 150,474 132,989
Construction    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 129,866 117,872
Construction | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 117,155 104,079
Construction | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 6,310 6,912
Construction | 43465    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 6,401 6,881
Construction - commercial    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 746,255 726,726
Construction - commercial | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 742,160 723,030
Construction - commercial | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 851 1,163
Construction - commercial | 43465    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 3,244 2,533
Construction - Commercial and Commercial Residential    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 876,121 844,598
Construction - Commercial and Commercial Residential | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 859,315 827,109
Construction - Commercial and Commercial Residential | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 7,161 8,075
Construction - Commercial and Commercial Residential | 43465    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 9,645 9,414
Commercial Loans, Commerical Mortgages, Constructions Loans    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross $ 11,734,347 $ 11,683,431
Percentage of total loans rated 100.00% 100.00%
Commercial Loans, Commerical Mortgages, Constructions Loans | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross $ 11,066,891 $ 11,030,645
Percentage of total loans rated 94.30% 94.40%
Commercial Loans, Commerical Mortgages, Constructions Loans | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross $ 360,923 $ 376,388
Percentage of total loans rated 3.10% 3.20%
Commercial Loans, Commerical Mortgages, Constructions Loans | 43465    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross $ 306,533 $ 276,398
Percentage of total loans rated 2.60% 2.40%