Loans, Loans Portfolio by Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	$ 810,481	$ 819,803
Commercial and industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	40,066	41,901
Commercial, secured by real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	475,276	476,944
Residential real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	261,320	266,255
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	17,744	19,261
Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	15,466	14,809
Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	609	633
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	773,855	779,924
Pass [Member] | Commercial and industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	39,432	41,178
Pass [Member] | Commercial, secured by real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	445,157	443,781
Pass [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	257,044	261,839
Pass [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	17,682	19,182
Pass [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	13,931	13,311
Pass [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	609	633
OAEM [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	6,803	6,225
OAEM [Member] | Commercial and industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	239	304
OAEM [Member] | Commercial, secured by real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	6,378	5,479
OAEM [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	186	442
OAEM [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
OAEM [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
OAEM [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	29,823	33,654
Substandard [Member] | Commercial and industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	395	419
Substandard [Member] | Commercial, secured by real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	23,741	27,684
Substandard [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	4,090	3,974
Substandard [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	62	79
Substandard [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	1,535	1,498
Substandard [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
Doubtful [Member] | Commercial and industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
Doubtful [Member] | Commercial, secured by real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
Doubtful [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
Doubtful [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
Doubtful [Member] | Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	0	0
Doubtful [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, net of deferred origination costs (fees)	$ 0	$ 0