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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	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
One-to-Four Family Residential Real Estate Loans [Member]
Impaired loans	$ 162	$ 110
Total (losses)/gains on impaired loans fair value disclosure	(15)	(29)
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	162	110
Construction and Land Loan [Member]
Impaired loans	328	322
Total (losses)/gains on impaired loans fair value disclosure	7	(103)
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	328	322
Commercial Real Estate Loans [Member]
Impaired loans	1,740	1,725
Total (losses)/gains on impaired loans fair value disclosure	(173)	377
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	1,740	1,725
Commercial Loans [Member]
Impaired loans	106	55
Total (losses)/gains on impaired loans fair value disclosure	6	(51)
Commercial Loans [Member] | Level 1 [Member]
Impaired loans
Commercial Loans [Member] | Level 2 [Member]
Impaired loans
Commercial Loans [Member] | Level 3 [Member]
Impaired loans	$ 106	55
Agriculture Loans [Member]
Impaired loans		175
Total (losses)/gains on impaired loans fair value disclosure		11
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

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- Definition

Gain Loss On Impaired Loans Fair Value Disclosure

+ References

No definition available.

+ Details

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as impaired loans disclosure.

+ References

No definition available.

+ Details

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