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Borrowed Funds - Scheduled Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Federal Home Loan Bank, Advances, Rolling Maturity [Abstract]    
2018 $ 8,500  
2019 6,000  
2020 6,000  
2021 5,500  
2022 0  
Thereafter 0  
Total borrowed funds $ 26,000 $ 44,000