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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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