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Fair Value of Financial Instruments and Fair Value Measurements - Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
One-To-Four Family Residential Real Estate [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | $ 20 |
Total gains/(losses) on impaired loans fair value disclosure | (15) |
Construction and Land [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | 162 |
Total gains/(losses) on impaired loans fair value disclosure | (36) |
Commercial RealEstate [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | 7 |
Commercial Loan [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  | $ 222
Total gains/(losses) on impaired loans fair value disclosure | 14 | (87)
Commercial [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | 172 |
Total gains/(losses) on impaired loans fair value disclosure | 52 |
Agriculture loan [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | 286 | 645
Total gains/(losses) on impaired loans fair value disclosure | (38) | (89)
Fair Value, Inputs, Level 1 [Member] | One-To-Four Family Residential Real Estate [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Fair Value, Inputs, Level 1 [Member] | Construction and Land [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Fair Value, Inputs, Level 1 [Member] | Commercial RealEstate [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Fair Value, Inputs, Level 1 [Member] | Commercial Loan [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Fair Value, Inputs, Level 1 [Member] | Commercial [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Fair Value, Inputs, Level 1 [Member] | Agriculture loan [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Fair Value, Inputs, Level 2 [Member] | One-To-Four Family Residential Real Estate [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Fair Value, Inputs, Level 2 [Member] | Construction and Land [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Fair Value, Inputs, Level 2 [Member] | Commercial RealEstate [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Fair Value, Inputs, Level 2 [Member] | Commercial Loan [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Fair Value, Inputs, Level 2 [Member] | Commercial [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Fair Value, Inputs, Level 2 [Member] | Agriculture loan [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Fair Value, Inputs, Level 3 [Member] | One-To-Four Family Residential Real Estate [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | 20 |
Fair Value, Inputs, Level 3 [Member] | Construction and Land [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | 162 |
Fair Value, Inputs, Level 3 [Member] | Commercial RealEstate [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | 7 |
Fair Value, Inputs, Level 3 [Member] | Commercial Loan [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  | 222
Fair Value, Inputs, Level 3 [Member] | Commercial [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | 172 |
Fair Value, Inputs, Level 3 [Member] | Agriculture loan [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | 286 | 645
Residential Real Estate [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | 149 | 142
Total gains/(losses) on impaired loans fair value disclosure | (26) | (34)
Residential Real Estate [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Residential Real Estate [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Residential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | $ 149 | 142
Commercial RealEstate [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  | 219
Total gains/(losses) on impaired loans fair value disclosure |  | (81)
Commercial RealEstate [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Commercial RealEstate [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Commercial RealEstate [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  | $ 219

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