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Annual Principal Payments on Federal Home Loan Bank Advances (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
2016 $ 6,175  
2017 20,122  
2018 113  
2019 42  
2020 19  
Thereafter 59  
Federal home loan bank, advances $ 26,530 $ 26,719