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Loans and Allowance for Loan Losses - Schedule of Troubled Debt Restructurings on Financing Receivables (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2020 USD ($) Number | Dec. 31, 2019 USD ($) 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 | $ 165 | $ 168
Construction and Land Loan [Member] |  |
Troubled debt restructurings, Number of loans | Number | 4 | 4
Financing receivable, modifications, recorded investment, non accrual balance | $ 508 | $ 510
Financing receivable, modifications, recorded investment, accruing balance | $ 523 | $ 581
Commercial Real Estate 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 | $ 2,021 | $ 2,021
Commercial 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 | $ 28 | $ 28
Agriculture Loans [Member] |  |
Troubled debt restructurings, Number of loans | Number | 4 | 4
Financing receivable, modifications, recorded investment, non accrual balance |  |
Financing receivable, modifications, recorded investment, accruing balance | $ 243 | $ 278
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 | 13
Financing receivable, modifications, recorded investment, non accrual balance | $ 508 | $ 510
Financing receivable, modifications, recorded investment, accruing balance | $ 3,038 | $ 3,134

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