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Fair Value of Financial Instruments and Fair Value Measurements - Schedule of Fair Value Measurements on Nonrecurring, 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 Fair Value Disclosure	$ 162	$ 110
Fair Value Measurements, Valuation Techniques	Sales comparison	Sales comparison
Fair Value Measurements, Unobservable inputs	Adjustment to appraised value	Adjustment to appraised value
One-to-Four Family Residential Real Estate Loans [Member] | Minimum [Member]
Fair Value Measurements Range	0.00%	0.00%
One-to-Four Family Residential Real Estate Loans [Member] | Maximum [Member]
Fair Value Measurements Range	47.00%	20.00%
Construction and Land Loan [Member]
Impaired Loans Fair Value Disclosure	$ 328	$ 322
Fair Value Measurements, Valuation Techniques	Sales comparison	Sales comparison
Fair Value Measurements, Unobservable inputs	Adjustment to appraised value	Adjustment to appraised value
Construction and Land Loan [Member] | Minimum [Member]
Fair Value Measurements Range	20.00%	0.00%
Construction and Land Loan [Member] | Maximum [Member]
Fair Value Measurements Range	25.00%	25.00%
Commercial Real Estate Loans [Member]
Impaired Loans Fair Value Disclosure	$ 1,740	$ 1,725
Fair Value Measurements, Valuation Techniques	Sales comparison	Sales comparison
Fair Value Measurements, Unobservable inputs	Adjustment to appraised value	Adjustment to appraised value
Fair Value Measurements Range		0.00%
Commercial Real Estate Loans [Member] | Minimum [Member]
Fair Value Measurements Range	0.00%
Commercial Real Estate Loans [Member] | Maximum [Member]
Fair Value Measurements Range	20.00%
Commercial Loans [Member]
Impaired Loans Fair Value Disclosure	$ 106	$ 55
Fair Value Measurements, Valuation Techniques	Sales comparison	Sales comparison
Fair Value Measurements, Unobservable inputs	Adjustment to comparable sales	Adjustment to comparable sales
Commercial Loans [Member] | Minimum [Member]
Fair Value Measurements Range	15.00%	0.00%
Commercial Loans [Member] | Maximum [Member]
Fair Value Measurements Range	28.00%	15.00%
Agriculture Loans [Member]
Impaired Loans Fair Value Disclosure		$ 175
Fair Value Measurements, Valuation Techniques		Sales comparison
Fair Value Measurements, Unobservable inputs		Adjustment to appraised value
Fair Value Measurements Range		0.00%

X

- Definition

Fair Value Measurements, Valuation Techniques.

+ References

No definition available.

+ Details

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- Definition

The range of Level 3 fair value measurements for impaired loans measured at fair value on a non-recurring basis.

+ References

No definition available.

+ Details

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X

- Definition

Fair Value Measurements, Unobservable inputs.

+ 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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- Details

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- Details

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- Details

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