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Loans and Allowance for Loan Losses - Schedule of Troubled Debt Restructurings on Financing Receivables (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 USD ($) Number | Dec. 31, 2018 USD ($) Number
One-to-Four Family Residential Real Estate Loans [Member] |  |
Troubled debt restructurings, Number of loans | Number | 2 | 2
Financing receivable, modifications, recorded investment, non accrual balance |  |
Financing receivable, modifications, recorded investment, accruing balance | $ 175 | $ 181
Construction and Land Loan [Member] |  |
Troubled debt restructurings, Number of loans | Number | 4 | 4
Financing receivable, modifications, recorded investment, non accrual balance | $ 518 | $ 523
Financing receivable, modifications, recorded investment, accruing balance | $ 711 | $ 860
Commercial Real Estate Loans [Member] |  |
Troubled debt restructurings, Number of loans | Number | 1 | 2
Financing receivable, modifications, recorded investment, non accrual balance |  |
Financing receivable, modifications, recorded investment, accruing balance | $ 2,023 | $ 2,121
Commercial Loans [Member] |  |
Troubled debt restructurings, Number of loans | Number | 1 | 1
Financing receivable, modifications, recorded investment, non accrual balance |  | $ 36
Financing receivable, modifications, recorded investment, accruing balance | $ 28 |
Agriculture Loans [Member] |  |
Troubled debt restructurings, Number of loans | Number | 4 | 4
Municipal Loans [Member] |  |
Troubled debt restructurings, Number of loans | Number | 1 | 1
Financing receivable, modifications, recorded investment, non accrual balance |  |
Financing receivable, modifications, recorded investment, accruing balance | $ 58 | $ 58
Troubled Debt Restructurings [Member] |  |
Troubled debt restructurings, Number of loans | Number | 13 | 14
Financing receivable, modifications, recorded investment, non accrual balance | $ 524 | $ 582
Financing receivable, modifications, recorded investment, accruing balance | 3,219 | 3,455
Agriculture Loans [Member] |  |
Financing receivable, modifications, recorded investment, non accrual balance | 6 | 23
Financing receivable, modifications, recorded investment, accruing balance | $ 224 | $ 235

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