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Loans and Allowance for Loan Losses - Schedule of Allowance for Credit Losses on Financing Receivables (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance $ 5,327 $ 5,869 $ 5,344 $ 5,922    
Charge-offs (119) (537) (245) (674)    
Recoveries 18 20 77 54    
Provision for loan losses 100 300 150 350    
Balance 5,326 5,652 5,326 5,652    
Individually evaluated for loss         $ 275 $ 274
Collectively evaluated for loss         5,051 5,070
Total 5,326 5,869 5,326 5,652 5,326 5,344
Individually evaluated for loss         6,427 6,728
Collectively evaluated for loss         421,599 419,041
Total         422,739 420,461
One-To-Four Family Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance 493 864 504 925    
Charge-offs (19)    
Recoveries 7 3 8 5    
Provision for loan losses (1) (283) 6 (346)    
Balance 499 584 499 584    
Individually evaluated for loss        
Collectively evaluated for loss         499 504
Total 499 864 499 584 499 504
Individually evaluated for loss         732 780
Collectively evaluated for loss         138,200 136,066
Total         138,932 136,846
Commercial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance 1,101 1,384 1,119 1,530    
Charge-offs (306) (306)    
Recoveries 1 1 9 20    
Provision for loan losses (21) 314 (47) 149    
Balance 1,081 1,393 1,081 1,393    
Individually evaluated for loss         76 87
Collectively evaluated for loss         1,005 1,032
Total 1,081 1,384 1,081 1,393 1,081 1,119
Individually evaluated for loss         323 355
Collectively evaluated for loss         51,308 54,151
Total         51,631 54,506
Agriculture [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance 1,731 1,483 1,684 1,428    
Charge-offs (83) (83)    
Recoveries 1    
Provision for loan losses 41 200 87 255    
Balance 1,772 1,600 1,772 1,600    
Individually evaluated for loss         149 89
Collectively evaluated for loss         1,623 1,595
Total 1,772 1,483 1,772 1,600 1,772 1,684
Individually evaluated for loss         868 881
Collectively evaluated for loss         78,442 77,443
Total         79,310 78,324
Municipal Bonds [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance 11 201   199    
Charge-offs (148)   (285)    
Recoveries 10   23    
Provision for loan losses (1) 124   250    
Balance 10 187 10 187    
Total 11 201 10 187 10  
Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance 180 24 195 23    
Charge-offs (58)    
Recoveries 10 6 6    
Provision for loan losses 53 (7) (2) (6)    
Balance 185 23 185 23    
Individually evaluated for loss         17
Collectively evaluated for loss         185 178
Total 185 24 185 23 185 195
Individually evaluated for loss         36 72
Collectively evaluated for loss         21,367 20,199
Total         21,403 20,271
Municipal [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance     195      
Charge-offs     (165)      
Recoveries     59      
Provision for loan losses     96      
Balance 10   10      
Individually evaluated for loss        
Collectively evaluated for loss         10 12
Total 10   10   10 195
Individually evaluated for loss         221 258
Collectively evaluated for loss         3,372 3,626
Total         3,593 3,884
Construction and Land [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance     53      
Balance 70   70      
Individually evaluated for loss        
Collectively evaluated for loss         70 53
Total 70   70   70 53
Individually evaluated for loss         2,041 1,937
Collectively evaluated for loss         14,516 11,801
Total         16,557 13,738
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance     1,777      
Balance 1,709   1,709      
Individually evaluated for loss         50 81
Collectively evaluated for loss         1,659 1,696
Total 1,709   1,709   1,709 1,777
Individually evaluated for loss         2,206 2,445
Collectively evaluated for loss         114,394 115,755
Total         116,600 118,200
Construction and Land [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance 71 82 53 77    
Charge-offs    
Recoveries    
Provision for loan losses (1) 7 17 12    
Balance 70 89 70 89    
Total 71 82 70 89 70 53
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance 1,740 1,831 1,777 1,740    
Charge-offs (61) (61)    
Recoveries    
Provision for loan losses 30 (55) (7) 36    
Balance 1,709 1,776 1,709 1,776    
Total $ 1,740 $ 1,831 $ 1,709 $ 1,776 $ 1,709 $ 1,777