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Loans and Allowance for Loan Losses - Schedule of Past Due Financing Receivables (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Loans, 90 days or more delinquent and accruing |  |
Loans, Total past due loans accruing | 1,475 | 1,355
Loans, Non-accrual loans | 5,557 | 6,041
Loan, Total past due and non-accrual loans | 7,032 | 7,396
Loan, Total loans not past due | $ 474,372 | $ 431,840
Percent of gross loans, 30-59 days delinquent and accruing | 0.18% | 0.05%
Percent of gross loans, 60-89 days delinquent and accruing | 0.13% | 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 | 0.31% | 0.31%
Percent of gross loans, Non-accrual loans | 1.15% | 1.37%
Percentage of Total past due and non-accrual loans | 1.46% | 1.68%
Percentage of Total loans not past due | 98.54% | 98.32%
Commercial Loan [Member] |  |
Loans, 90 days or more delinquent and accruing |  |
Loans, Total past due loans accruing | 119 | 397
Loans, Non-accrual loans | 2,013 | 2,002
Loan, Total past due and non-accrual loans | 2,132 | 2,399
Loan, Total loans not past due | 65,766 | 52,192
Agriculture Loan [Member] |  |
Loans, 90 days or more delinquent and accruing |  |
Loans, Total past due loans accruing | 344 |
Loans, Non-accrual loans | 413 | 833
Loan, Total past due and non-accrual loans | 757 | 833
Loan, Total loans not past due | 90,619 | 82,175
Municipal Loan [Member] |  |
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 | 2,990 | 3,396
Consumer Loan [Member] |  |
Loans, 90 days or more delinquent and accruing |  |
Loans, Total past due loans accruing | 39 | 309
Loans, Non-accrual loans | 80 | 34
Loan, Total past due and non-accrual loans | 119 | 343
Loan, Total loans not past due | 22,893 | 21,703
30-59 Days Delinquent and Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due | 868 | 228
30-59 Days Delinquent and Accruing [Member] | Commercial Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due | 26 |
30-59 Days Delinquent and Accruing [Member] | Agriculture Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due | 294 |
30-59 Days Delinquent and Accruing [Member] | Municipal Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due |  |
30-59 Days Delinquent and Accruing [Member] | Consumer Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due | 35 | 105
60-89 Days Delinquent and Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due | 607 | 1,127
60-89 Days Delinquent and Accruing [Member] | Commercial Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due | 93 | 397
60-89 Days Delinquent and Accruing [Member] | Agriculture Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due | 50 |
60-89 Days Delinquent and Accruing [Member] | Municipal Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due |  |
60-89 Days Delinquent and Accruing [Member] | Consumer Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due | 4 | 204
One-To-Four Family Residential Real Estate Loan [Member] |  |
Loans, 90 days or more delinquent and accruing |  |
Loans, Total past due loans accruing | 473 | 414
Loans, Non-accrual loans | 588 | 552
Loan, Total past due and non-accrual loans | 1,061 | 966
Loan, Total loans not past due | 135,934 | 135,249
One-To-Four Family Residential Real Estate Loan [Member] | 30-59 Days Delinquent and Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due | 129 | 101
One-To-Four Family Residential Real Estate Loan [Member] | 60-89 Days Delinquent and Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due | 344 | 313
Construction and Land Loan [Member] |  |
Loans, 90 days or more delinquent and accruing |  |
Loans, Total past due loans accruing | 273 | 4
Loans, Non-accrual loans | 671 | 779
Loan, Total past due and non-accrual loans | 944 | 783
Loan, Total loans not past due | 29,897 | 18,573
Construction and Land Loan [Member] | 30-59 Days Delinquent and Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due | 157 |
Construction and Land Loan [Member] | 60-89 Days Delinquent and Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due | 116 | 4
Commercial Real Estate Loan [Member] |  |
Loans, 90 days or more delinquent and accruing |  |
Loans, Total past due loans accruing | 227 | 231
Loans, Non-accrual loans | 1,792 | 1,841
Loan, Total past due and non-accrual loans | 2,019 | 2,072
Loan, Total loans not past due | 126,273 | 118,552
Commercial Real Estate Loan [Member] | 30-59 Days Delinquent and Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due | 227 | 22
Commercial Real Estate Loan [Member] | 60-89 Days Delinquent and Accruing [Member] |  |
Financing Receivable, Recorded Investment, Past Due |  | $ 209

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