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Deposits (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Banking and Thrift [Abstract]    
Savings $ 1,051,904 $ 1,051,922
Money market 1,592,468 1,496,310
NOW 2,019,822 2,049,645
Non-interest bearing 1,434,660 1,481,753
Certificates of deposit 804,602 750,492
Total deposits $ 6,903,456 $ 6,830,122