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Loans and Allowance for Credit Losses Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross $ 15,368,586 $ 14,718,662
Real-estate - commercial mortgage    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 6,262,008 6,018,582
Real-estate - commercial mortgage | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 6,004,958 5,763,122
Real-estate - commercial mortgage | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 119,534 132,484
Real-estate - commercial mortgage | December 31, 2016    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 137,516 122,976
Commercial - secured    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 4,102,585 3,933,552
Commercial - secured | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 3,813,864 3,686,152
Commercial - secured | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 119,119 128,873
Commercial - secured | December 31, 2016    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 169,602 118,527
Commercial - unsecured    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 143,264 153,934
Commercial - unsecured | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 134,455 145,922
Commercial - unsecured | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 6,264 4,481
Commercial - unsecured | December 31, 2016    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 2,545 3,531
Commercial - industrial, financial and agricultural    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 4,245,849 4,087,486
Commercial - industrial, financial and agricultural | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 3,948,319 3,832,074
Commercial - industrial, financial and agricultural | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 125,383 133,354
Commercial - industrial, financial and agricultural | December 31, 2016    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 172,147 122,058
Construction - commercial residential    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 157,291 142,189
Construction - commercial residential | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 131,115 113,570
Construction - commercial residential | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 9,789 15,447
Construction - commercial residential | December 31, 2016    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 16,387 13,172
Construction - commercial    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 728,649 644,490
Construction - commercial | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 718,702 635,963
Construction - commercial | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 4,727 3,412
Construction - commercial | December 31, 2016    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 5,220 5,115
Construction - Commercial and Commercial Residential    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 885,940 786,679
Construction - Commercial and Commercial Residential | Pass    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 849,817 749,533
Construction - Commercial and Commercial Residential | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 14,516 18,859
Construction - Commercial and Commercial Residential | December 31, 2016    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross 21,607 18,287
Commercial Loans, Commerical Mortgages, Constructions Loans    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross $ 11,393,797 $ 10,892,747
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 $ 10,803,094 $ 10,344,729
Percentage of total loans rated 94.80% 95.00%
Commercial Loans, Commerical Mortgages, Constructions Loans | Special Mention    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross $ 259,433 $ 284,697
Percentage of total loans rated 2.30% 2.60%
Commercial Loans, Commerical Mortgages, Constructions Loans | December 31, 2016    
Internal risk ratings for loans by segment [Line Items]    
Loans and Leases Receivable, Gross $ 331,270 $ 263,321
Percentage of total loans rated 2.90% 2.40%