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Federal Home Loan Bank Advances - Summary of Future Obligations of FHLB Advances (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Banking and Thrift [Abstract]    
2017 $ 5,000  
2018 5,000  
Federal Home Loan Bank (FHLB) Advances $ 10,000 $ 10,000