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Deposits - Summary of Major Types of Deposits (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Banking and Thrift [Abstract]    
Non-interest-bearing $ 1,370,167 $ 1,151,362
Interest-bearing checking 2,342,913 2,350,106
Money market deposit 642,985 569,680
Savings 909,501 877,177
Time deposits 921,921 866,244
Total deposits $ 6,187,487 $ 5,814,569