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Deposits - Summary of Noninterest Bearing and Interest Bearing Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deposits [Abstract]      
Non-interest bearing $ 1,404,032 $ 1,269,296  
Interest bearing 3,943,610 3,858,704  
Total deposits $ 5,347,642 $ 5,128,000 $ 4,789,994