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Deposits - Schedule of Deposits (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Banking and Thrift [Abstract]    
Savings $ 1,055,503 $ 985,478
Money market 1,547,874 1,468,352
NOW 1,651,959 1,540,894
Non-interest bearing 1,240,110 1,189,542
Certificates of deposit 734,440 739,721
Total deposits $ 6,229,886 $ 5,923,987