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Loans and Allowance for Loan Losses - Schedule of Accounts, Notes, Loans and Financing Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total gross loans $ 434,054   $ 425,769      
Net deferred loan costs and loans in process (236)   36      
Allowance for loan losses (5,379) $ (5,326) (5,344) $ (5,507) $ (5,652) $ (5,922)
Loans, net, carrying amount $ 428,439   $ 420,461      
Total gross loans 100.00%   100.00%      
One-To-Four Family Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total gross loans $ 136,829   $ 136,846      
Allowance for loan losses     (504) (609) (584) (925)
Loans, net, carrying amount $ 136,829   $ 136,846      
Total gross loans 31.50%   32.10%      
Construction and Land [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total gross loans $ 15,898   $ 13,738      
Allowance for loan losses (103) (70) (53)      
Loans, net, carrying amount $ 15,898   $ 13,738      
Total gross loans 3.70%   3.20%      
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total gross loans $ 120,818   $ 118,200      
Allowance for loan losses (1,720)   (1,777)      
Loans, net, carrying amount $ 120,818   $ 118,200      
Total gross loans 27.80%   27.80%      
Commercial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total gross loans $ 50,944   $ 54,506      
Allowance for loan losses (1,009) (1,081) (1,119) (1,374) (1,393) (1,530)
Loans, net, carrying amount $ 50,944   $ 54,506      
Total gross loans 11.70%   12.80%      
Agriculture [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total gross loans $ 84,101   $ 78,324      
Allowance for loan losses (1,859) (1,772) (1,684) (1,473) (1,600) (1,428)
Loans, net, carrying amount $ 84,101   $ 78,324      
Total gross loans 19.40%   18.40%      
Municipal [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total gross loans $ 3,479   $ 3,884      
Allowance for loan losses (9)   (12)      
Loans, net, carrying amount $ 3,479   $ 3,884      
Total gross loans 0.80%   0.90%      
Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total gross loans $ 21,985   $ 20,271      
Allowance for loan losses (179) $ (185) (195) $ (23) $ (23) $ (23)
Loans, net, carrying amount $ 21,985   $ 20,271      
Total gross loans 5.10%   4.80%