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Deposits (Schedule of Deposits) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Banking and Thrift [Abstract]    
Savings $ 1,115,328 $ 1,099,020
Money market 1,537,905 1,582,750
NOW 1,850,577 1,871,298
Non-interest bearing 1,346,687 1,349,378
Certificates of deposit 679,373 651,183
Total deposits $ 6,529,870 $ 6,553,629