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Federal Home Loan Bank Advances - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Banking and Thrift [Abstract]    
Advances from FHLB $ 17,500 $ 22,500
Maturities from January 2017 through October 2019, fixed rates, minimum 1.50%  
Maturities from January 2017 through October 2019, fixed rates, maximum 4.25%  
Maturities from January 2017 through October 2019, fixed rates, averaging 2.06%  
Maturities, year from 2017  
Maturities, year to 2019  
Outstanding letters of credit with FHLB $ 21,200 22,700
FHLB borrowings collateralized by residential mortgage loans 138,600 $ 131,850
FHLB maximum borrowing capacity 132,054  
FHLB remaining borrowing capacity $ 39,654