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Loans and Allowance for Loan Losses - Schedule of Past Due Financing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due	$ 488,340	$ 431,840
Loans, 90 days or more delinquent and accruing
Loans, Total past due loans accruing	1,671	1,355
Loans, Non-accrual loans	5,236	6,041
Loan, Total past due and non-accrual loans	6,907	7,396
Loan, Total loans not past due	$ 488,340	$ 431,840
Percent of gross loans, 30-59 days delinquent and accruing	0.24%	0.05%
Percent of gross loans, 60-89 days delinquent and accruing	0.10%	0.26%
Percent of gross loans, 90 days or more delinquent and accruing	0.00%	0.00%
Percentage of gross loans, Total past due loans accruing	0.34%	0.31%
Percent of gross loans, Non-accrual loans	1.06%	1.37%
Percentage of Total past due and non-accrual loans	1.40%	1.68%
Percentage of Total loans not past due	98.60%	98.32%
Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due	$ 72,343	$ 52,192
Loans, 90 days or more delinquent and accruing
Loans, Total past due loans accruing	418	397
Loans, Non-accrual loans	1,528	2,002
Loan, Total past due and non-accrual loans	1,946	2,399
Loan, Total loans not past due	72,343	52,192
Agriculture Loans [Member]
Financing Receivable, Recorded Investment, Past Due	95,962	82,175
Loans, 90 days or more delinquent and accruing
Loans, Total past due loans accruing	188
Loans, Non-accrual loans	482	833
Loan, Total past due and non-accrual loans	670	833
Loan, Total loans not past due	95,962	82,175
Municipal Loans [Member]
Financing Receivable, Recorded Investment, Past Due	2,953	3,396
Loans, 90 days or more delinquent and accruing
Loans, Total past due loans accruing
Loans, Non-accrual loans
Loan, Total past due and non-accrual loans
Loan, Total loans not past due	2,953	3,396
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due	25,254	21,703
Loans, 90 days or more delinquent and accruing
Loans, Total past due loans accruing	39	309
Loans, Non-accrual loans	45	34
Loan, Total past due and non-accrual loans	174	343
Loan, Total loans not past due	25,254	21,703
30-59 Days Delinquent and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due	1,200	228
Loan, Total loans not past due	1,200	228
30-59 Days Delinquent and Accruing [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due	398
Loan, Total loans not past due	398
30-59 Days Delinquent and Accruing [Member] | Agriculture Loans [Member]
Financing Receivable, Recorded Investment, Past Due	100
Loan, Total loans not past due	100
30-59 Days Delinquent and Accruing [Member] | Municipal Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Loan, Total loans not past due
60-89 Days Delinquent and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due	471	1,127
Loan, Total loans not past due	471	1,127
60-89 Days Delinquent and Accruing [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due	20
Loan, Total loans not past due	20
60-89 Days Delinquent and Accruing [Member] | Agriculture Loans [Member]
Financing Receivable, Recorded Investment, Past Due	88
Loan, Total loans not past due	88
60-89 Days Delinquent and Accruing [Member] | Municipal Loans [Member]
Financing Receivable, Recorded Investment, Past Due
Loan, Total loans not past due
60-89 Days Delinquent and Accruing [Member] | Consumer Loans [Member]
Financing Receivable, Recorded Investment, Past Due	23	204
Loan, Total loans not past due	23	204
One-to-Four Family Residential Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due	136,116	135,249
Loans, 90 days or more delinquent and accruing
Loans, Total past due loans accruing	337	414
Loans, Non-accrual loans	442	552
Loan, Total past due and non-accrual loans	779	966
Loan, Total loans not past due	136,116	135,249
One-to-Four Family Residential Real Estate Loans [Member] | 30-59 Days Delinquent and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due	131	101
Loan, Total loans not past due	131	101
One-to-Four Family Residential Real Estate Loans [Member] | 60-89 Days Delinquent and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due	206	313
Loan, Total loans not past due	206	313
Construction and Land Loan [Member]
Financing Receivable, Recorded Investment, Past Due	19,001	18,573
Loans, 90 days or more delinquent and accruing
Loans, Total past due loans accruing	134	4
Loans, Non-accrual loans	948	779
Loan, Total past due and non-accrual loans	1,082	783
Loan, Total loans not past due	19,001	18,573
Construction and Land Loan [Member] | 30-59 Days Delinquent and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due
Loan, Total loans not past due
Construction and Land Loan [Member] | 60-89 Days Delinquent and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due	134	4
Loan, Total loans not past due	134	4
Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment, Past Due	136,711	118,552
Loans, 90 days or more delinquent and accruing
Loans, Total past due loans accruing	465	231
Loans, Non-accrual loans	1,791	1,841
Loan, Total past due and non-accrual loans	2,256	2,072
Loan, Total loans not past due	136,711	118,552
Commercial Real Estate Loans [Member] | 30-59 Days Delinquent and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due	465	22
Loan, Total loans not past due	465	22
Commercial Real Estate Loans [Member] | 60-89 Days Delinquent and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due		209
Loan, Total loans not past due		209
Consumer Loans [Member] | 30-59 Days Delinquent and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due	106	105
Loan, Total loans not past due	$ 106	105
Commercial Loans [Member] | 30-59 Days Delinquent and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due
Loan, Total loans not past due
Commercial Loans [Member] | 60-89 Days Delinquent and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due		397
Loan, Total loans not past due		397
Agriculture Loans [Member] | 30-59 Days Delinquent and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due
Loan, Total loans not past due
Municipal Loans [Member] | 30-59 Days Delinquent and Accruing [Member]
Financing Receivable, Recorded Investment, Past Due
Loan, Total loans not past due

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