Loans, Credit Quality Indicator (Details) (USD $)			9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Minimum [Member]	Sep. 30, 2014 Construction [Member]	Dec. 31, 2013 Construction [Member]	Sep. 30, 2014 Mortgages [Member]	Dec. 31, 2013 Mortgages [Member]	Sep. 30, 2014 Home Equity [Member]	Dec. 31, 2013 Home Equity [Member]	Sep. 30, 2014 Commercial [Member]	Dec. 31, 2013 Commercial [Member]	Sep. 30, 2014 Agricultural [Member]	Dec. 31, 2013 Agricultural [Member]	Sep. 30, 2014 Consumer [Member]	Dec. 31, 2013 Consumer [Member]	Sep. 30, 2014 Other Commercial Loans [Member]	Dec. 31, 2013 Other Commercial Loans [Member]	Sep. 30, 2014 Other Agricultural Loans [Member]	Dec. 31, 2013 Other Agricultural Loans [Member]	Sep. 30, 2014 State and Political Subdivision Loans [Member]	Dec. 31, 2013 State and Political Subdivision Loans [Member]	Sep. 30, 2014 Pass [Member]	Dec. 31, 2013 Pass [Member]	Sep. 30, 2014 Pass [Member] Construction [Member]	Dec. 31, 2013 Pass [Member] Construction [Member]	Sep. 30, 2014 Pass [Member] Commercial [Member]	Dec. 31, 2013 Pass [Member] Commercial [Member]	Sep. 30, 2014 Pass [Member] Agricultural [Member]	Dec. 31, 2013 Pass [Member] Agricultural [Member]	Sep. 30, 2014 Pass [Member] Other Commercial Loans [Member]	Dec. 31, 2013 Pass [Member] Other Commercial Loans [Member]	Sep. 30, 2014 Pass [Member] Other Agricultural Loans [Member]	Dec. 31, 2013 Pass [Member] Other Agricultural Loans [Member]	Sep. 30, 2014 Pass [Member] State and Political Subdivision Loans [Member]	Dec. 31, 2013 Pass [Member] State and Political Subdivision Loans [Member]	Sep. 30, 2014 Special Mention [Member]	Dec. 31, 2013 Special Mention [Member]	Sep. 30, 2014 Special Mention [Member] Construction [Member]	Dec. 31, 2013 Special Mention [Member] Construction [Member]	Sep. 30, 2014 Special Mention [Member] Commercial [Member]	Dec. 31, 2013 Special Mention [Member] Commercial [Member]	Sep. 30, 2014 Special Mention [Member] Agricultural [Member]	Dec. 31, 2013 Special Mention [Member] Agricultural [Member]	Sep. 30, 2014 Special Mention [Member] Other Commercial Loans [Member]	Dec. 31, 2013 Special Mention [Member] Other Commercial Loans [Member]	Sep. 30, 2014 Special Mention [Member] Other Agricultural Loans [Member]	Dec. 31, 2013 Special Mention [Member] Other Agricultural Loans [Member]	Sep. 30, 2014 Special Mention [Member] State and Political Subdivision Loans [Member]	Dec. 31, 2013 Special Mention [Member] State and Political Subdivision Loans [Member]	Sep. 30, 2014 Substandard [Member]	Dec. 31, 2013 Substandard [Member]	Sep. 30, 2014 Substandard [Member] Construction [Member]	Dec. 31, 2013 Substandard [Member] Construction [Member]	Sep. 30, 2014 Substandard [Member] Commercial [Member]	Dec. 31, 2013 Substandard [Member] Commercial [Member]	Sep. 30, 2014 Substandard [Member] Agricultural [Member]	Dec. 31, 2013 Substandard [Member] Agricultural [Member]	Sep. 30, 2014 Substandard [Member] Other Commercial Loans [Member]	Dec. 31, 2013 Substandard [Member] Other Commercial Loans [Member]	Sep. 30, 2014 Substandard [Member] Other Agricultural Loans [Member]	Dec. 31, 2013 Substandard [Member] Other Agricultural Loans [Member]	Sep. 30, 2014 Substandard [Member] State and Political Subdivision Loans [Member]	Dec. 31, 2013 Substandard [Member] State and Political Subdivision Loans [Member]	Sep. 30, 2014 Doubtful [Member]	Dec. 31, 2013 Doubtful [Member]	Sep. 30, 2014 Doubtful [Member] Construction [Member]	Dec. 31, 2013 Doubtful [Member] Construction [Member]	Sep. 30, 2014 Doubtful [Member] Commercial [Member]	Dec. 31, 2013 Doubtful [Member] Commercial [Member]	Sep. 30, 2014 Doubtful [Member] Agricultural [Member]	Dec. 31, 2013 Doubtful [Member] Agricultural [Member]	Sep. 30, 2014 Doubtful [Member] Other Commercial Loans [Member]	Dec. 31, 2013 Doubtful [Member] Other Commercial Loans [Member]	Sep. 30, 2014 Doubtful [Member] Other Agricultural Loans [Member]	Dec. 31, 2013 Doubtful [Member] Other Agricultural Loans [Member]	Sep. 30, 2014 Doubtful [Member] State and Political Subdivision Loans [Member]	Dec. 31, 2013 Doubtful [Member] State and Political Subdivision Loans [Member]	Sep. 30, 2014 Loss [Member]	Dec. 31, 2013 Loss [Member]	Sep. 30, 2014 Loss [Member] Construction [Member]	Dec. 31, 2013 Loss [Member] Construction [Member]	Sep. 30, 2014 Loss [Member] Commercial [Member]	Dec. 31, 2013 Loss [Member] Commercial [Member]	Sep. 30, 2014 Loss [Member] Agricultural [Member]	Dec. 31, 2013 Loss [Member] Agricultural [Member]	Sep. 30, 2014 Loss [Member] Other Commercial Loans [Member]	Dec. 31, 2013 Loss [Member] Other Commercial Loans [Member]	Sep. 30, 2014 Loss [Member] Other Agricultural Loans [Member]	Dec. 31, 2013 Loss [Member] Other Agricultural Loans [Member]	Sep. 30, 2014 Loss [Member] State and Political Subdivision Loans [Member]	Dec. 31, 2013 Loss [Member] State and Political Subdivision Loans [Member]	Sep. 30, 2014 Internally Assigned Grade [Member]	Dec. 31, 2013 Internally Assigned Grade [Member]	Sep. 30, 2014 Performing [Member]	Dec. 31, 2013 Performing [Member]	Sep. 30, 2014 Performing [Member] Mortgages [Member]	Dec. 31, 2013 Performing [Member] Mortgages [Member]	Sep. 30, 2014 Performing [Member] Home Equity [Member]	Dec. 31, 2013 Performing [Member] Home Equity [Member]	Sep. 30, 2014 Performing [Member] Consumer [Member]	Dec. 31, 2013 Performing [Member] Consumer [Member]	Sep. 30, 2014 Nonperforming [Member]	Dec. 31, 2013 Nonperforming [Member]	Sep. 30, 2014 Nonperforming [Member] Mortgages [Member]	Dec. 31, 2013 Nonperforming [Member] Mortgages [Member]	Sep. 30, 2014 Nonperforming [Member] Home Equity [Member]	Dec. 31, 2013 Nonperforming [Member] Home Equity [Member]	Sep. 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 new loans to be reviewed, minimum			$ 1,000,000
Amount over which all relationships to be reviewed, minimum			1,000,000
Amount which is 90 days past due to be reviewed for all aggregate loan relationships, minimum			750,000
Financing Receivable by credit exposure [Abstract]
Total	$ 196,113,000	$ 196,664,000		$ 4,960,000	$ 8,937,000	$ 123,384,000	$ 119,884,000	$ 63,931,000	$ 67,217,000	$ 187,692,000	$ 193,087,000	$ 24,196,000	$ 22,001,000	$ 8,798,000	$ 9,563,000	$ 45,145,000	$ 44,488,000	$ 11,519,000	$ 9,541,000	$ 74,130,000	$ 65,894,000	$ 310,202,000	$ 305,939,000	$ 4,960,000	$ 8,937,000	$ 165,424,000	$ 166,956,000	$ 19,109,000	$ 15,923,000	$ 36,982,000	$ 40,798,000	$ 9,597,000	$ 7,431,000	$ 74,130,000	$ 65,894,000	$ 17,404,000	$ 8,455,000	$ 0	$ 0	$ 8,993,000	$ 4,645,000	$ 2,963,000	$ 1,910,000	$ 4,996,000	$ 1,747,000	$ 452,000	$ 153,000	$ 0	$ 0	$ 20,029,000	$ 29,347,000	$ 0	$ 0	$ 13,275,000	$ 21,284,000	$ 2,124,000	$ 4,168,000	$ 3,160,000	$ 1,938,000	$ 1,470,000	$ 1,957,000	$ 0	$ 0	$ 7,000	$ 207,000	$ 0	$ 0	$ 0	$ 202,000	$ 0	$ 0	$ 7,000	$ 5,000	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 347,642,000	$ 343,948,000	$ 194,718,000	$ 195,611,000	$ 122,393,000	$ 119,075,000	$ 63,577,000	$ 66,989,000	$ 8,748,000	$ 9,547,000	$ 1,395,000	$ 1,053,000	$ 991,000	$ 809,000	$ 354,000	$ 228,000	$ 50,000	$ 16,000