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Deposits - Summary of Major Types of Deposits (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Banking and Thrift [Abstract]    
Non-interest-bearing $ 362,079 $ 279,944
Interest-bearing checking 883,940 836,120
Money market deposit 151,657 95,663
Savings 310,009 301,190
Time deposits 260,086 207,218
Total deposits $ 1,967,771 $ 1,720,135