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Deposits - Summary of Major Types of Deposits (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Banking and Thrift [Abstract]    
Non-interest-bearing $ 1,196,875 $ 756,513
Interest-bearing checking 2,332,215 1,954,358
Money market deposit 584,250 363,656
Savings 887,799 661,167
Time deposits 853,111 607,104
Total deposits $ 5,854,250 $ 4,342,798