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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	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
One-To-Four Family Residential Real Estate Loan [Member]
Impaired Loans Fair Value Disclosure	$ 133	$ 171
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 Loan [Member] | Minimum [Member]
Fair Value Measurements Range	0.00%	16.00%
One-To-Four Family Residential Real Estate Loan [Member] | Maximum [Member]
Fair Value Measurements Range	20.00%	50.00%
Commercial Real Estate Loan [Member]
Impaired Loans Fair Value Disclosure	$ 23	$ 33
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 Loan [Member] | Minimum [Member]
Fair Value Measurements Range		0.00%
Commercial Real Estate Loan [Member] | Maximum [Member]
Fair Value Measurements Range		91.00%
Commercial Loan [Member]
Impaired Loans Fair Value Disclosure	$ 1,345	$ 1,600
Fair Value Measurements, Valuation Techniques	Sales comparison	Sales comparison
Fair Value Measurements, Unobservable inputs	Adjustment to comparable sales	Adjustment to comparable sales
Commercial Loan [Member] | Minimum [Member]
Fair Value Measurements Range	15.00%	15.00%
Commercial Loan [Member] | Maximum [Member]
Fair Value Measurements Range	90.00%	50.00%
One-To-Four Family Residential Real Estate Loan [Member]
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		10.00%
Real Estate Owned Fair Value Disclosure	$ 51	$ 325
One-To-Four Family Residential Real Estate Loan [Member] | Minimum [Member]
Fair Value Measurements Range	6.00%
One-To-Four Family Residential Real Estate Loan [Member] | Maximum [Member]
Fair Value Measurements Range	10.00%
Construction and Land Loan [Member]
Impaired Loans Fair Value Disclosure		$ 1,499
Fair Value Measurements, Valuation Techniques		Sales comparison
Fair Value Measurements, Unobservable inputs		Adjustment to appraised value
Construction and Land Loan [Member] | Minimum [Member]
Fair Value Measurements Range		0.00%
Construction and Land Loan [Member] | Maximum [Member]
Fair Value Measurements Range		25.00%
Agriculture Loan [Member]
Impaired Loans Fair Value Disclosure		$ 264
Fair Value Measurements, Valuation Techniques		Sales comparison
Fair Value Measurements, Unobservable inputs		Adjustment to appraised value
Agriculture Loan [Member] | Minimum [Member]
Fair Value Measurements Range		0.00%
Agriculture Loan [Member] | Maximum [Member]
Fair Value Measurements Range		50.00%
Commercial Real Estate Loan [Member]
Fair Value Measurements, Valuation Techniques		Sales comparison
Fair Value Measurements, Unobservable inputs		Adjustment to appraised value
Fair Value Measurements Range		10.00%
Real Estate Owned Fair Value Disclosure		$ 85

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- Definition

Fair Value Measurements, Valuation Techniques.

+ References

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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

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- Definition

Fair Value Measurements, Unobservable inputs.

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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

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- Definition

Represents the amount of real estate owned fair value disclosure.

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