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Loans and Allowance for Credit Losses Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 14,391,238 $ 13,838,602 $ 13,536,361
Commercial Loans, Commerical Mortgages, Constructions Loans [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 10,641,834 $ 10,290,586  
Percentage of total loans rated 100.00% 100.00%  
Real-estate commercial mortage [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 5,818,915 $ 5,462,330 5,339,928
Commercial - industrial, financial, and agricultural [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 4,024,119 4,088,962 $ 3,929,908
Commercial - Secured [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 3,876,533 3,926,113  
Commercial - unsecured [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 147,586 162,849  
Construction, Excluding Construction Other [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 798,800 739,294  
Construction - Commercial Residential [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 161,908 179,303  
Construction - Commercial [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 636,892 559,991  
Pass [Member] | Commercial Loans, Commerical Mortgages, Constructions Loans [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 10,104,843 $ 9,750,744  
Percentage of total loans rated 95.00% 94.80%  
Pass [Member] | Real-estate commercial mortage [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 5,555,760 $ 5,204,263  
Pass [Member] | Commercial - industrial, financial, and agricultural [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 3,787,894 3,853,434  
Pass [Member] | Commercial - Secured [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 3,648,221 3,696,692  
Pass [Member] | Commercial - unsecured [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 139,673 156,742  
Pass [Member] | Construction, Excluding Construction Other [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 761,189 693,047  
Pass [Member] | Construction - Commercial Residential [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 131,875 140,337  
Pass [Member] | Construction - Commercial [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 629,314 552,710  
Special Mention [Member] | Commercial Loans, Commerical Mortgages, Constructions Loans [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 262,034 $ 218,935  
Percentage of total loans rated 2.40% 2.10%  
Special Mention [Member] | Real-estate commercial mortage [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 131,941 $ 102,625  
Special Mention [Member] | Commercial - industrial, financial, and agricultural [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 111,710 95,472  
Special Mention [Member] | Commercial - Secured [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 106,701 92,711  
Special Mention [Member] | Commercial - unsecured [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 5,009 2,761  
Special Mention [Member] | Construction, Excluding Construction Other [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 18,383 20,838  
Special Mention [Member] | Construction - Commercial Residential [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 15,853 17,154  
Special Mention [Member] | Construction - Commercial [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 2,530 3,684  
Substandard [Member] | Commercial Loans, Commerical Mortgages, Constructions Loans [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 274,957 $ 320,907  
Percentage of total loans rated 2.60% 3.10%  
Substandard [Member] | Real-estate commercial mortage [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 131,214 $ 155,442  
Substandard [Member] | Commercial - industrial, financial, and agricultural [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 124,515 140,056  
Substandard [Member] | Commercial - Secured [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 121,611 136,710  
Substandard [Member] | Commercial - unsecured [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 2,904 3,346  
Substandard [Member] | Construction, Excluding Construction Other [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 19,228 25,409  
Substandard [Member] | Construction - Commercial Residential [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income 14,180 21,812  
Substandard [Member] | Construction - Commercial [Member]      
Internal risk ratings for loans by segment [Line Items]      
Loans and Leases Receivable, Net of Deferred Income $ 5,048 $ 3,597