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Fair Value of Financial Instruments and Fair Value Measurements - Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
One-To-Four Family Residential Real Estate [Member] | Minimum [Member] | Commercial Loan [Member]
Fair Value Measurements Sales Comparison Range	7.00%
One-To-Four Family Residential Real Estate [Member] | Maximum [Member] | Commercial Loan [Member]
Fair Value Measurements Sales Comparison Range	40.00%
Construction and Land [Member] | Minimum [Member] | Commercial Loan [Member]
Fair Value Measurements Sales Comparison Range	6.00%
Construction and Land [Member] | Maximum [Member] | Commercial Loan [Member]
Fair Value Measurements Sales Comparison Range	35.00%
Commercial Real Estate [Member] | Minimum [Member] | Commercial Loan [Member]
Fair Value Measurements Sales Comparison Range	5.00%
Commercial Real Estate [Member] | Maximum [Member] | Commercial Loan [Member]
Fair Value Measurements Sales Comparison Range	40.00%
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate [Member]
Impaired Loans Fair Value Disclosure		$ 219
Fair Value Measurements, Valuation Techniques		Sales comparison
Fair Value Measurements, Changes in Valuation Techniques		Adjustment to appraised value
Fair Value, Measurements, Nonrecurring [Member] | Commercial Loan [Member]
Impaired Loans Fair Value Disclosure	$ 172	$ 222
Fair Value Measurements, Valuation Techniques	Sales comparison	Sales comparison
Fair Value Measurements, Changes in Valuation Techniques	Adjustment to comparable sales	Adjustment to comparable sales
Fair Value, Measurements, Nonrecurring [Member] | Agriculture Loans [Member]
Impaired Loans Fair Value Disclosure	$ 286	$ 645
Fair Value Measurements, Valuation Techniques	Sales comparison	Sales comparison
Fair Value Measurements, Changes in Valuation Techniques	Adjustment to appraised value	Adjustment to appraised value
Fair Value, Measurements, Nonrecurring [Member] | One-To-Four Family Residential Real Estate [Member]
Impaired Loans Fair Value Disclosure		$ 142
Real Estate Owned Fair Value Disclosure	$ 149
Fair Value Measurements, Valuation Techniques	Sales comparison	Sales comparison
Fair Value Measurements, Changes in Valuation Techniques	Adjustment to comparable sales	Adjustment to appraised value
Fair Value Measurements Sales Comparison Range	10.00%	10.00%
Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] | Commercial Real Estate [Member]
Fair Value Measurements Sales Comparison Range		2.00%
Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] | Commercial Loan [Member]
Fair Value Measurements Sales Comparison Range	15.00%	7.00%
Fair Value, Measurements, Nonrecurring [Member] | Minimum [Member] | Agriculture Loans [Member]
Fair Value Measurements Sales Comparison Range	10.00%	8.00%
Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] | Commercial Real Estate [Member]
Fair Value Measurements Sales Comparison Range		15.00%
Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] | Commercial Loan [Member]
Fair Value Measurements Sales Comparison Range	20.00%	80.00%
Fair Value, Measurements, Nonrecurring [Member] | Maximum [Member] | Agriculture Loans [Member]
Fair Value Measurements Sales Comparison Range	25.00%	80.00%
Fair Value, Measurements, Nonrecurring [Member] | One-To-Four Family Residential Real Estate [Member]
Impaired Loans Fair Value Disclosure	$ 20
Fair Value Measurements, Valuation Techniques	Sales comparison
Fair Value Measurements, Changes in Valuation Techniques	Adjustment to appraised value
Fair Value, Measurements, Nonrecurring [Member] | Construction and Land [Member]
Impaired Loans Fair Value Disclosure	$ 162
Fair Value Measurements, Valuation Techniques	Sales comparison
Fair Value Measurements, Changes in Valuation Techniques	Adjustment to appraised value
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate [Member]
Impaired Loans Fair Value Disclosure	$ 7
Fair Value Measurements, Valuation Techniques	Sales comparison
Fair Value Measurements, Changes in Valuation Techniques	Adjustment to appraised value

X

- 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

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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- Definition

Represents the amount of real estate owned fair value disclosure.

+ References

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- Definition

Description of the changes in valuation technique(s) and related inputs used to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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