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Deposits - Summary of Noninterest Bearing and Interest Bearing Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deposits [Abstract]      
Non-interest bearing $ 1,523,417 $ 1,404,032  
Interest bearing 3,998,539 3,943,610  
Total deposits $ 5,521,956 $ 5,347,642 $ 5,128,000