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Goodwill - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 12, 2015
Sep. 30, 2015
Apr. 17, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Goodwill [Line Items]            
Goodwill   $ 205,376   $ 202,724 $ 188,948 $ 188,948
Goodwill reduction   $ 8,474        
FMIG            
Goodwill [Line Items]            
Goodwill reduction $ 8,474          
Merger with C Financial Corporation            
Goodwill [Line Items]            
Goodwill     $ 11,126