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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance $ 5,326 $ 5,652 $ 5,344 $ 5,922    
Charge-offs (84) (318) (329) (992)    
Recoveries 37 23 114 77    
Provision for loan losses 100 150 250 500    
Balance 5,379 5,507 5,379 5,507    
Individually evaluated for loss         $ 250 $ 274
Collectively evaluated for loss         5,129 5,070
Total 5,379 5,652 5,379 5,507 5,379 5,344
Individually evaluated for loss         9,259 6,728
Collectively evaluated for loss         424,795 419,041
Total         428,439 420,461
One-To-Four Family Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance 499          
Charge-offs          
Recoveries 1          
Provision for loan losses          
Balance 500   500      
Total 500   500   500  
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance 1,709 1,776 1,777 1,740    
Charge-offs (61)    
Recoveries    
Provision for loan losses 11 (40) 4 (4)    
Balance 1,720 1,736 1,720 1,736    
Total 1,709 1,776 1,720 1,736 1,720 1,777
Construction and Land [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance   89 53 77    
Charge-offs      
Recoveries      
Provision for loan losses   (7) 50 5    
Balance   82   82    
Total   89 53 82   53
Construction and Land [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance 70   53      
Charge-offs          
Recoveries          
Provision for loan losses 33          
Balance 103   103      
Individually evaluated for loss         36
Collectively evaluated for loss         67 53
Total 103   103   103 53
Individually evaluated for loss         2,083 1,937
Collectively evaluated for loss         13,815 11,801
Total         15,898 13,738
Commercial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance 1,081 1,393 1,119 1,530    
Charge-offs (306)    
Recoveries 10 9 19 29    
Provision for loan losses (82) (28) (129) 121    
Balance 1,009 1,374 1,009 1,374    
Individually evaluated for loss         35 87
Collectively evaluated for loss         974 1,032
Total 1,009 1,393 1,009 1,374 1,009 1,119
Individually evaluated for loss         1,579 355
Collectively evaluated for loss         49,365 54,151
Total         50,944 54,506
Agriculture [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance 1,772 1,600 1,684 1,428    
Charge-offs (215) (298)    
Recoveries 1    
Provision for loan losses 87 88 174 343    
Balance 1,859 1,473 1,859 1,473    
Individually evaluated for loss         111 89
Collectively evaluated for loss         1,748 1,595
Total 1,859 1,600 1,859 1,473 1,859 1,684
Individually evaluated for loss         883 881
Collectively evaluated for loss         83,218 77,443
Total         84,101 78,324
Municipal Bonds [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance 10 187   199    
Charge-offs (89)   (374)    
Recoveries 14 11   34    
Provision for loan losses (15) 101   351    
Balance 9 210 9 210    
Total 10 187 9 210 9  
Consumer [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance 185 23 195 23    
Charge-offs (84) (249)    
Recoveries 12 71 6    
Provision for loan losses 66 162 (6)    
Balance 179 23 179 23    
Individually evaluated for loss         17
Collectively evaluated for loss         179 178
Total 179 23 179 23 179 195
Individually evaluated for loss         44 72
Collectively evaluated for loss         21,941 20,199
Total         21,985 20,271
One-To-Four Family Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance   584 504 925    
Charge-offs   (14) (19) (14)    
Recoveries   3 9 8    
Provision for loan losses   36 6 (310)    
Balance   609   609    
Individually evaluated for loss         15
Collectively evaluated for loss         485 504
Total   $ 584 504 $ 609   504
Individually evaluated for loss         531 780
Collectively evaluated for loss         136,298 136,066
Total         136,829 136,846
Municipal [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance     12      
Charge-offs          
Recoveries     14      
Provision for loan losses     (17)      
Balance 9   9      
Individually evaluated for loss        
Collectively evaluated for loss         9 12
Total 9   9   9 12
Individually evaluated for loss         140 258
Collectively evaluated for loss         3,339 3,626
Total         3,479 3,884
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Balance     1,777      
Balance 1,720   1,720      
Individually evaluated for loss         53 81
Collectively evaluated for loss         1,667 1,696
Total $ 1,720   $ 1,720   1,720 1,777
Individually evaluated for loss         3,999 2,445
Collectively evaluated for loss         116,819 115,755
Total         $ 120,818 $ 118,200