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Loans and Allowance for Loan Losses - Schedule of Allowance for Credit Losses on Financing Receivables (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Balance $ 5,765 $ 5,459 $ 5,344      
Charge-offs (825) (1,160) (488)      
Recoveries 127 66 153      
Provision for loan losses 1,400 1,400 450      
Balance 6,467 5,765 5,459      
Individually evaluated for loss       $ 733 $ 310 $ 642
Collectively evaluated for loss       5,734 5,455 4,817
Total 5,765 5,459 5,459 6,467 5,765 5,459
Individually evaluated for loss       8,680 8,691 9,760
Collectively evaluated for loss       529,712 486,556 429,476
Loans and Leases Receivable, Gross, Total       538,392 495,247 439,236
One-to-Four Family Residential Real Estate Loans [Member]            
Balance 449 542 504      
Charge-offs (56) (32) (37)      
Recoveries 1 4 11      
Provision for loan losses 107 (65) 64      
Balance 501 449 542      
Individually evaluated for loss       129 100 73
Collectively evaluated for loss       372 349 469
Total 501 449 504 501 449 542
Individually evaluated for loss       1,256 623 747
Collectively evaluated for loss       145,249 136,272 135,468
Loans and Leases Receivable, Gross, Total       146,505 136,895 136,215
Construction and Land Loan [Member]            
Balance 168 181 53      
Charge-offs (31)      
Recoveries      
Provision for loan losses 134 (13) 128      
Balance 271 168 181      
Individually evaluated for loss       191 103 102
Collectively evaluated for loss       80 65 79
Total 271 168 53 271 168 181
Individually evaluated for loss       1,479 1,808 2,031
Collectively evaluated for loss       20,980 18,275 17,325
Loans and Leases Receivable, Gross, Total       22,459 20,083 19,356
Commercial Real Estate Loans [Member]            
Balance 1,686 1,540 1,777      
Charge-offs (71)      
Recoveries 1      
Provision for loan losses (300) 145 (166)      
Balance 1,386 1,686 1,540      
Individually evaluated for loss       103 67 52
Collectively evaluated for loss       1,283 1,619 1,488
Total 1,386 1,686 1,777 1,386 1,686 1,540
Individually evaluated for loss       3,461 3,912 3,973
Collectively evaluated for loss       130,040 135,055 116,651
Loans and Leases Receivable, Gross, Total       133,501 138,967 120,624
Commercial Loans [Member]            
Balance 1,051 1,226 1,119      
Charge-offs (453) (950)      
Recoveries 53 22 20      
Provision for loan losses 1,164 753 87      
Balance 1,815 1,051 1,226      
Individually evaluated for loss       204 27 391
Collectively evaluated for loss       1,611 1,024 835
Total 1,815 1,226 1,119 1,815 1,051 1,226
Individually evaluated for loss       1,298 1,528 2,002
Collectively evaluated for loss       108,314 72,761 52,589
Loans and Leases Receivable, Gross, Total       109,612 74,289 54,591
Agriculture Loans [Member]            
Balance 2,238 1,812 1,684      
Charge-offs (45)      
Recoveries 1 1      
Provision for loan losses 109 425 172      
Balance 2,347 2,238 1,812      
Individually evaluated for loss       106 13 24
Collectively evaluated for loss       2,241 2,225 1,788
Total 2,347 2,238 1,684 2,347 2,238 1,812
Individually evaluated for loss       1,124 717 833
Collectively evaluated for loss       97,434 95,915 82,175
Loans and Leases Receivable, Gross, Total       98,558 96,632 83,008
Municipal Loans [Member]            
Balance 7 8 12      
Charge-offs      
Recoveries 6 2 37      
Provision for loan losses (6) (3) (41)      
Balance 7 7 8      
Individually evaluated for loss      
Collectively evaluated for loss       7 7 8
Total 7 7 12 7 7 8
Individually evaluated for loss       58 58 140
Collectively evaluated for loss       2,598 2,895 3,256
Loans and Leases Receivable, Gross, Total       2,656 2,953 3,396
Consumer Loans [Member]            
Balance 166 150 195      
Charge-offs (285) (178) (335)      
Recoveries 67 36 84      
Provision for loan losses 192 158 206      
Balance 140 166 150      
Individually evaluated for loss      
Collectively evaluated for loss       140 166 150
Total $ 140 $ 150 $ 150 140 166 150
Individually evaluated for loss       4 45 34
Collectively evaluated for loss       25,097 25,383 22,012
Loans and Leases Receivable, Gross, Total       $ 25,101 $ 25,428 $ 22,046