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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Balance $ 5,644 $ 5,327 $ 5,459 $ 5,344    
Charge-offs (73) (119) (106) (245)    
Recoveries 14 18 32 77    
Provision for loan losses 250 100 450 150    
Balance 5,835 5,326 5,835 5,326    
Individually evaluated for loss         $ 853 $ 642
Collectively evaluated for loss         4,982 4,817
Total 5,835 5,327 5,459 5,344 5,835 5,459
Individually evaluated for loss         9,018 9,760
Collectively evaluated for loss         458,119 429,476
Total         467,137 439,236
One-To-Four Family Residential Real Estate Loan [Member]            
Balance 477 493 542 504    
Charge-offs (19)    
Recoveries 1 7 2 8    
Provision for loan losses (39) (1) (105) 6    
Balance 439 499 439 499    
Individually evaluated for loss         85 73
Collectively evaluated for loss         354 469
Total 439 499 542 504 439 542
Individually evaluated for loss         651 747
Collectively evaluated for loss         137,616 135,468
Total         138,267 136,215
Construction and Land Loan [Member]            
Balance 121 71 181 53    
Charge-offs    
Recoveries    
Provision for loan losses (12) (1) (72) 17    
Balance 109 70 109 70    
Individually evaluated for loss         102
Collectively evaluated for loss         109 79
Total 109 70 181 70 109 181
Individually evaluated for loss         1,641 2,031
Collectively evaluated for loss         24,812 17,325
Total         26,453 19,356
Commercial Real Estate Loan [Member]            
Balance 1,562 1,740 1,540 1,777    
Charge-offs (61) (61)    
Recoveries 1    
Provision for loan losses (96) 30 (75) (7)    
Balance 1,466 1,709 1,466 1,709    
Individually evaluated for loss         14 52
Collectively evaluated for loss         1,452 1,488
Total 1,466 1,709 1,540 1,777 1,466 1,540
Individually evaluated for loss         3,920 3,973
Collectively evaluated for loss         118,026 116,651
Total         121,946 120,624
Commercial Loan [Member]            
Balance     1,226      
Charge-offs (29) (29)    
Recoveries 1 1 2 9    
Provision for loan losses 237 (21) 494 (47)    
Balance 1,693   1,693      
Individually evaluated for loss         728 391
Collectively evaluated for loss         965 835
Total 1,693   1,693   1,693 1,226
Individually evaluated for loss         2,032 2,002
Collectively evaluated for loss         64,499 52,589
Total         66,531 54,591
Agriculture Loan [Member]            
Balance 1,867 1,731 1,812 1,684    
Charge-offs    
Recoveries 1    
Provision for loan losses 138 41 193 87    
Balance 2,005 1,772 2,005 1,772    
Individually evaluated for loss         25 24
Collectively evaluated for loss         1,980 1,788
Total 2,005 1,772 1,812 1,684 2,005 1,812
Individually evaluated for loss         602 833
Collectively evaluated for loss         87,299 82,175
Total         87,901 83,008
Municipal Loan [Member]            
Balance 7 11 8 12    
Charge-offs    
Recoveries 2    
Provision for loan losses (1) (3) (2)    
Balance 7 10 7 10    
Individually evaluated for loss        
Collectively evaluated for loss         7 8
Total 7 10 8 12 7 8
Individually evaluated for loss         126 140
Collectively evaluated for loss         3,046 3,256
Total         3,172 3,396
Consumer Loan [Member]            
Balance 126 180 150 195    
Charge-offs (44) (58) (77) (165)    
Recoveries 12 10 25 59    
Provision for loan losses 22 53 18 96    
Balance 116 185 116 185    
Individually evaluated for loss         1
Collectively evaluated for loss         115 150
Total $ 116 $ 185 $ 116 $ 195 116 150
Individually evaluated for loss         46 34
Collectively evaluated for loss         22,821 22,012
Total         $ 22,867 $ 22,046