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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 |

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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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- 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 No definition available. + Details
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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 + Details
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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 + Details
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