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Deposits - Summary of Deposits Including Accrued Interest Payable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Banking and Thrift [Abstract]    
Non-interest-bearing accounts, Amount $ 337,143 $ 279,944
Interest-bearing checking accounts, Amount 859,927 836,120
Money market deposit accounts, Amount 153,196 95,663
Savings accounts, Amount 310,989 301,190
Time deposits, Amount 255,423 207,218
Total deposits $ 1,916,678 $ 1,720,135
Non-interest-bearing accounts, Weighted Average Cost 0.00% 0.00%
Interest-bearing checking accounts, Weighted Average Cost 0.12% 0.09%
Money market deposit accounts, Weighted Average Cost 0.23% 0.06%
Savings accounts, Weighted Average Cost 0.03% 0.03%
Time deposits, Weighted Average Cost 1.39% 1.45%
Weighted Average Cost 0.26% 0.23%