Loans, Credit Quality Indicator (Details) (USD $)			6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Minimum [Member]	Jun. 30, 2014 Construction [Member]	Dec. 31, 2013 Construction [Member]	Jun. 30, 2014 Mortgages [Member]	Dec. 31, 2013 Mortgages [Member]	Jun. 30, 2014 Home Equity [Member]	Dec. 31, 2013 Home Equity [Member]	Jun. 30, 2014 Commercial [Member]	Dec. 31, 2013 Commercial [Member]	Jun. 30, 2014 Agricultural [Member]	Dec. 31, 2013 Agricultural [Member]	Jun. 30, 2014 Consumer [Member]	Dec. 31, 2013 Consumer [Member]	Jun. 30, 2014 Other Commercial Loans [Member]	Dec. 31, 2013 Other Commercial Loans [Member]	Jun. 30, 2014 Other Agricultural Loans [Member]	Dec. 31, 2013 Other Agricultural Loans [Member]	Jun. 30, 2014 State and Political Subdivision Loans [Member]	Dec. 31, 2013 State and Political Subdivision Loans [Member]	Jun. 30, 2014 Pass [Member]	Dec. 31, 2013 Pass [Member]	Jun. 30, 2014 Pass [Member] Construction [Member]	Dec. 31, 2013 Pass [Member] Construction [Member]	Jun. 30, 2014 Pass [Member] Commercial [Member]	Dec. 31, 2013 Pass [Member] Commercial [Member]	Jun. 30, 2014 Pass [Member] Agricultural [Member]	Dec. 31, 2013 Pass [Member] Agricultural [Member]	Jun. 30, 2014 Pass [Member] Other Commercial Loans [Member]	Dec. 31, 2013 Pass [Member] Other Commercial Loans [Member]	Jun. 30, 2014 Pass [Member] Other Agricultural Loans [Member]	Dec. 31, 2013 Pass [Member] Other Agricultural Loans [Member]	Jun. 30, 2014 Pass [Member] State and Political Subdivision Loans [Member]	Dec. 31, 2013 Pass [Member] State and Political Subdivision Loans [Member]	Jun. 30, 2014 Special Mention [Member]	Dec. 31, 2013 Special Mention [Member]	Jun. 30, 2014 Special Mention [Member] Construction [Member]	Dec. 31, 2013 Special Mention [Member] Construction [Member]	Jun. 30, 2014 Special Mention [Member] Commercial [Member]	Dec. 31, 2013 Special Mention [Member] Commercial [Member]	Jun. 30, 2014 Special Mention [Member] Agricultural [Member]	Dec. 31, 2013 Special Mention [Member] Agricultural [Member]	Jun. 30, 2014 Special Mention [Member] Other Commercial Loans [Member]	Dec. 31, 2013 Special Mention [Member] Other Commercial Loans [Member]	Jun. 30, 2014 Special Mention [Member] Other Agricultural Loans [Member]	Dec. 31, 2013 Special Mention [Member] Other Agricultural Loans [Member]	Jun. 30, 2014 Special Mention [Member] State and Political Subdivision Loans [Member]	Dec. 31, 2013 Special Mention [Member] State and Political Subdivision Loans [Member]	Jun. 30, 2014 Substandard [Member]	Dec. 31, 2013 Substandard [Member]	Jun. 30, 2014 Substandard [Member] Construction [Member]	Dec. 31, 2013 Substandard [Member] Construction [Member]	Jun. 30, 2014 Substandard [Member] Commercial [Member]	Dec. 31, 2013 Substandard [Member] Commercial [Member]	Jun. 30, 2014 Substandard [Member] Agricultural [Member]	Dec. 31, 2013 Substandard [Member] Agricultural [Member]	Jun. 30, 2014 Substandard [Member] Other Commercial Loans [Member]	Dec. 31, 2013 Substandard [Member] Other Commercial Loans [Member]	Jun. 30, 2014 Substandard [Member] Other Agricultural Loans [Member]	Dec. 31, 2013 Substandard [Member] Other Agricultural Loans [Member]	Jun. 30, 2014 Substandard [Member] State and Political Subdivision Loans [Member]	Dec. 31, 2013 Substandard [Member] State and Political Subdivision Loans [Member]	Jun. 30, 2014 Doubtful [Member]	Dec. 31, 2013 Doubtful [Member]	Jun. 30, 2014 Doubtful [Member] Construction [Member]	Dec. 31, 2013 Doubtful [Member] Construction [Member]	Jun. 30, 2014 Doubtful [Member] Commercial [Member]	Dec. 31, 2013 Doubtful [Member] Commercial [Member]	Jun. 30, 2014 Doubtful [Member] Agricultural [Member]	Dec. 31, 2013 Doubtful [Member] Agricultural [Member]	Jun. 30, 2014 Doubtful [Member] Other Commercial Loans [Member]	Dec. 31, 2013 Doubtful [Member] Other Commercial Loans [Member]	Jun. 30, 2014 Doubtful [Member] Other Agricultural Loans [Member]	Dec. 31, 2013 Doubtful [Member] Other Agricultural Loans [Member]	Jun. 30, 2014 Doubtful [Member] State and Political Subdivision Loans [Member]	Dec. 31, 2013 Doubtful [Member] State and Political Subdivision Loans [Member]	Jun. 30, 2014 Loss [Member]	Dec. 31, 2013 Loss [Member]	Jun. 30, 2014 Loss [Member] Construction [Member]	Dec. 31, 2013 Loss [Member] Construction [Member]	Jun. 30, 2014 Loss [Member] Commercial [Member]	Dec. 31, 2013 Loss [Member] Commercial [Member]	Jun. 30, 2014 Loss [Member] Agricultural [Member]	Dec. 31, 2013 Loss [Member] Agricultural [Member]	Jun. 30, 2014 Loss [Member] Other Commercial Loans [Member]	Dec. 31, 2013 Loss [Member] Other Commercial Loans [Member]	Jun. 30, 2014 Loss [Member] Other Agricultural Loans [Member]	Dec. 31, 2013 Loss [Member] Other Agricultural Loans [Member]	Jun. 30, 2014 Loss [Member] State and Political Subdivision Loans [Member]	Dec. 31, 2013 Loss [Member] State and Political Subdivision Loans [Member]	Jun. 30, 2014 Internally Assigned Grade [Member]	Dec. 31, 2013 Internally Assigned Grade [Member]	Jun. 30, 2014 Performing [Member]	Dec. 31, 2013 Performing [Member]	Jun. 30, 2014 Performing [Member] Mortgages [Member]	Dec. 31, 2013 Performing [Member] Mortgages [Member]	Jun. 30, 2014 Performing [Member] Home Equity [Member]	Dec. 31, 2013 Performing [Member] Home Equity [Member]	Jun. 30, 2014 Performing [Member] Consumer [Member]	Dec. 31, 2013 Performing [Member] Consumer [Member]	Jun. 30, 2014 Nonperforming [Member]	Dec. 31, 2013 Nonperforming [Member]	Jun. 30, 2014 Nonperforming [Member] Mortgages [Member]	Dec. 31, 2013 Nonperforming [Member] Mortgages [Member]	Jun. 30, 2014 Nonperforming [Member] Home Equity [Member]	Dec. 31, 2013 Nonperforming [Member] Home Equity [Member]	Jun. 30, 2014 Nonperforming [Member] Consumer [Member]	Dec. 31, 2013 Nonperforming [Member] Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of dollar volume of commercial loan portfolio to be reviewed, minimum (in hundredths)			55.00%
Amount over which all relationships to be reviewed, minimum			$ 500,000
Amount which is 90 days past due to be reviewed for all aggregate loan relationships, minimum			100,000
Financing Receivable by credit exposure [Abstract]
Total	$ 195,875,000	$ 196,664,000		$ 3,474,000	$ 8,937,000	$ 122,475,000	$ 119,884,000	$ 64,708,000	$ 67,217,000	$ 186,977,000	$ 193,087,000	$ 23,809,000	$ 22,001,000	$ 8,692,000	$ 9,563,000	$ 48,008,000	$ 44,488,000	$ 10,082,000	$ 9,541,000	$ 71,652,000	$ 65,894,000	$ 303,067,000	$ 305,939,000	$ 3,474,000	$ 8,937,000	$ 162,474,000	$ 166,956,000	$ 18,657,000	$ 15,923,000	$ 39,143,000	$ 40,798,000	$ 7,667,000	$ 7,431,000	$ 71,652,000	$ 65,894,000	$ 18,427,000	$ 8,455,000	$ 0	$ 0	$ 9,735,000	$ 4,645,000	$ 2,991,000	$ 1,910,000	$ 5,233,000	$ 1,747,000	$ 468,000	$ 153,000	$ 0	$ 0	$ 22,450,000	$ 29,347,000	$ 0	$ 0	$ 14,768,000	$ 21,284,000	$ 2,161,000	$ 4,168,000	$ 3,574,000	$ 1,938,000	$ 1,947,000	$ 1,957,000	$ 0	$ 0	$ 58,000	$ 207,000	$ 0	$ 0	$ 0	$ 202,000	$ 0	$ 0	$ 58,000	$ 5,000	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 344,002,000	$ 343,948,000	$ 194,897,000	$ 195,611,000	$ 121,682,000	$ 119,075,000	$ 64,557,000	$ 66,989,000	$ 8,658,000	$ 9,547,000	$ 978,000	$ 1,053,000	$ 793,000	$ 809,000	$ 151,000	$ 228,000	$ 34,000	$ 16,000