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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 | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Commercial Loan [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | $ 177 | $ 222
Total gains/(losses) on impaired loans fair value disclosure | 11 | (87)
Agriculture loan [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | 670 | 645
Total gains/(losses) on impaired loans fair value disclosure | (60) | (89)
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] | Agriculture loan [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] | Agriculture loan [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Fair Value, Inputs, Level 3 [Member] | Commercial Loan [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | 177 | 222
Fair Value, Inputs, Level 3 [Member] | Agriculture loan [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | 670 | 645
Residential Real Estate [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans | 302 | 142
Total gains/(losses) on impaired loans fair value disclosure | (67) | (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 | $ 302 | 142
Commercial Real Estate [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 Real Estate [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Commercial Real Estate [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  |
Commercial Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans |  | $ 219

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