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Deposits - Summary of Major Types of Deposits (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Banking and Thrift [Abstract]    
Non-interest-bearing $ 554,709 $ 337,143
Interest-bearing checking 1,310,290 859,927
Money market deposit 366,942 153,196
Savings 489,132 310,989
Time deposits 485,189 255,423
Total deposits $ 3,206,262 $ 1,916,678