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Deposits (Schedule of Deposits) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Banking and Thrift [Abstract]    
Savings $ 1,074,708 $ 985,478
Money market 1,586,397 1,468,352
NOW 1,908,250 1,540,894
Non-interest bearing 1,289,713 1,189,542
Certificates of deposit 668,430 739,721
Total deposits $ 6,527,498 $ 5,923,987