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Deposits - Summary of Major Types of Deposits (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Banking and Thrift [Abstract]    
Non-interest-bearing $ 770,057 $ 782,504
Interest-bearing checking 1,727,828 1,626,713
Money market deposit 378,538 458,911
Savings 677,939 672,519
Time deposits 622,547 647,103
Total deposits $ 4,176,909 $ 4,187,750