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Federal Home Loan Bank Advances - Scheduled Principal Reductions of Federal Home Loan Bank Advances Outstanding (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Banking and Thrift [Abstract]    
2017 $ 2,500  
2018 10,000  
2019 5,000  
Total $ 17,500 $ 17,500