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Fair Value of Financial Instruments and Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured On Nonrecurring Basis, Valuation Techniques (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
One-to-Four Family Residential Real Estate Loans [Member] |  |
Impaired loans | $ 110 | $ 171
Total (losses)/gains on impaired loans fair value disclosure | (29) | (73)
One-to-Four Family Residential Real Estate Loans [Member] | Level 1 [Member] |  |
Impaired loans |  |
One-to-Four Family Residential Real Estate Loans [Member] | Level 2 [Member] |  |
Impaired loans |  |
One-to-Four Family Residential Real Estate Loans [Member] | Level 3 [Member] |  |
Impaired loans | 110 | 171
Construction and Land Loan [Member] |  |
Impaired loans | 322 | 1,499
Total (losses)/gains on impaired loans fair value disclosure | (103) | (102)
Construction and Land Loan [Member] | Level 1 [Member] |  |
Impaired loans |  |
Construction and Land Loan [Member] | Level 2 [Member] |  |
Impaired loans |  |
Construction and Land Loan [Member] | Level 3 [Member] |  |
Impaired loans | 322 | 1,499
Commercial Real Estate Loans [Member] |  |
Impaired loans | 1,725 | 33
Total (losses)/gains on impaired loans fair value disclosure | 377 | 12
Commercial Real Estate Loans [Member] | Level 1 [Member] |  |
Impaired loans |  |
Commercial Real Estate Loans [Member] | Level 2 [Member] |  |
Impaired loans |  |
Commercial Real Estate Loans [Member] | Level 3 [Member] |  |
Impaired loans | 1,725 | 33
Commercial Loans [Member] |  |
Impaired loans | 55 | 1,600
Total (losses)/gains on impaired loans fair value disclosure | (51) | (304)
Commercial Loans [Member] | Level 1 [Member] |  |
Impaired loans |  |
Commercial Loans [Member] | Level 2 [Member] |  |
Impaired loans |  |
Commercial Loans [Member] | Level 3 [Member] |  |
Impaired loans | 55 | 1,600
Agriculture Loans [Member] |  |
Impaired loans | 175 | 264
Total (losses)/gains on impaired loans fair value disclosure | 11 | 65
Agriculture Loans [Member] | Level 1 [Member] |  |
Impaired loans |  |
Agriculture Loans [Member] | Level 2 [Member] |  |
Impaired loans |  |
Agriculture Loans [Member] | Level 3 [Member] |  |
Impaired loans | $ 175 | 264
Real Estate Owned One-To-Four Family Residential Real Estate Loan [Member] |  |
Impaired loans |  | 325
Total (losses)/gains on impaired loans fair value disclosure |  | (68)
Real Estate Owned One-To-Four Family Residential Real Estate Loan [Member] | Level 1 [Member] |  |
Impaired loans |  |
Real Estate Owned One-To-Four Family Residential Real Estate Loan [Member] | Level 2 [Member] |  |
Impaired loans |  |
Real Estate Owned One-To-Four Family Residential Real Estate Loan [Member] | Level 3 [Member] |  |
Impaired loans |  | 325
Real Estate Owned Commercial Real Estate Loan [Member] |  |
Impaired loans |  | 85
Total (losses)/gains on impaired loans fair value disclosure |  | (50)
Real Estate Owned Commercial Real Estate Loan [Member] | Level 1 [Member] |  |
Impaired loans |  |
Real Estate Owned Commercial Real Estate Loan [Member] | Level 2 [Member] |  |
Impaired loans |  |
Real Estate Owned Commercial Real Estate Loan [Member] | Level 3 [Member] |  |
Impaired loans |  | $ 85

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