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Sale of Branches (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2014
Sep. 30, 2015
Dec. 31, 2014
Jan. 17, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Loans   $ 21,613,409 $ 20,836,382  
Deposits   $ 22,777,413 $ 21,531,700  
Trust One Bank, Memphis, Tennessee [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Loans       $ 89,600
Deposits       $ 191,300
Gain on sale of branches $ 5,800