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Deposits - Schedule of Deposits (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Banking and Thrift [Abstract]    
Savings $ 1,005,430 $ 985,478
Money market 1,546,619 1,468,352
NOW 1,621,395 1,540,894
Non-interest bearing 1,185,800 1,189,542
Certificates of deposit 795,618 739,721
Total deposits $ 6,154,862 $ 5,923,987