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Deposits - Scheduled Maturities for Time Deposits (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Maturities of Time Deposits [Abstract]    
2015 $ 97,439us-gaap_TimeDepositMaturitiesYearOne  
2016 49,634us-gaap_TimeDepositMaturitiesYearTwo  
2017 19,586us-gaap_TimeDepositMaturitiesYearThree  
2018 24,864us-gaap_TimeDepositMaturitiesYearFour  
2019 3,053us-gaap_TimeDepositMaturitiesYearFive  
thereafter 924us-gaap_TimeDepositMaturitiesAfterYearFive  
Total $ 195,500us-gaap_TimeDeposits $ 236,360us-gaap_TimeDeposits