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Deposits - Summary of Major Types of Deposits (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Banking and Thrift [Abstract]    
Non-interest-bearing $ 512,957 $ 337,143
Interest-bearing checking 1,451,083 859,927
Money market deposit 400,054 153,196
Savings 489,173 310,989
Time deposits 471,414 255,423
Total deposits $ 3,324,681 $ 1,916,678