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Borrowed Funds - Additional Information (Details)
3 Months Ended
Jun. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
advance
Dec. 31, 2016
USD ($)
advance
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Short-term borrowed funds   $ 2,500,000 $ 9,500,000
Maximum borrowing capacity   2,200,000.0  
Short term advances     $ 7,000,000
Federal Home Loan Bank, rate on advances     0.74%
Number of advances outstanding | advance     6
Par value of federal home loan bank advances     $ 5,000,000
Loans pledged as collateral   318,600,000  
Long-term borrowed funds   23,500,000 34,500,000
Loans from other Federal Home Loan banks   20,000,000  
Deposits with other Federal Home Loan Banks   120,700,000  
Maximum amount available   177,900,000  
Unsecured Term Loan      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Stated interest rate 4.75%    
Face amount of unsecured term advance $ 5,000,000    
Debt instrument, term 5 years    
Principal payments $ 250,000    
Long-term borrowed funds   $ 3,500,000 4,500,000
Federal Home Loan Bank Advances, Maturing 2018 To 2021      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Number of advances outstanding | advance   4  
Par value of federal home loan bank advances   $ 20,000,000.0 30,000,000
Federal Home Loan Bank Advances, Maturing 2018 To 2021 | Minimum      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Federal Home Loan Bank, rate on advances   1.69%  
Federal Home Loan Bank Advances, Maturing 2018 To 2021 | Maximum      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Federal Home Loan Bank, rate on advances   2.06%  
Federal Home Loan Bank Advances, Maturing 2018 To 2021, Advance 1      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Par value of federal home loan bank advances   $ 5,000,000  
Federal Home Loan Bank Advances, Maturing 2018 To 2021, Advance 2      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Par value of federal home loan bank advances   5,000,000.0 5,000,000.0
Federal Home Loan Bank Advances, Maturing 2018 To 2021, Advance 3      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Par value of federal home loan bank advances   5,000,000.0 5,000,000.0
Federal Home Loan Bank Advances, Maturing 2018 To 2021, Advance 4      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Par value of federal home loan bank advances   5,000,000.0 5,000,000.0
Federal Home Loan Bank Advances, Maturing 2018 To 2021, Advance 5      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Par value of federal home loan bank advances     5,000,000.0
Federal Home Loan Bank Advances, Maturing 2018 To 2021, Advance 6      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Par value of federal home loan bank advances     5,000,000.0
Line of Credit      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Short-term borrowed funds   2,500,000 2,500,000
Maximum borrowing capacity   $ 6,000,000.0 $ 5,000,000.0
Stated interest rate   4.75% 4.25%
Unused funds   $ 3,500,000