Allowance for Loan Losses, by class of loan (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	$ 11,806,000	$ 12,737,000
Charge-Offs	(658,000)	(1,501,000)
Recoveries	235,000	194,000
Provision	327,000	1,500,000
Ending Balance	11,710,000	12,930,000
Impaired loans below the $250,000 review threshold	3,990,000	1,970,000
Substandard [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Substandard loans, not classified as impaired	7,400,000	10,600,000
Specific allocation associated with Substandard loans	620,000	645,000
Commercial [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	1,017,000	981,000
Charge-Offs	(27,000)	(31,000)
Recoveries	14,000	18,000
Provision	7,000	39,000
Ending Balance	1,011,000	1,007,000
Agricultural [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	294,000	296,000
Charge-Offs	0	0
Recoveries	1,000	4,000
Provision	2,000	0
Ending Balance	297,000	300,000
Commercial Construction [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	1,782,000	1,890,000
Charge-Offs	0	(692,000)
Recoveries	182,000	80,000
Provision	125,000	511,000
Ending Balance	2,089,000	1,789,000
Residential Construction [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	138,000	138,000
Charge-Offs	0	0
Recoveries	0	0
Provision	0	0
Ending Balance	138,000	138,000
Commercial Real Estate [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	4,379,000	5,163,000
Charge-Offs	(236,000)	(485,000)
Recoveries	6,000	43,000
Provision	131,000	593,000
Ending Balance	4,280,000	5,314,000
Residential Real Estate [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	3,278,000	3,406,000
Charge-Offs	(293,000)	(187,000)
Recoveries	6,000	5,000
Provision	38,000	228,000
Ending Balance	3,029,000	3,452,000
Farmland [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	312,000	291,000
Charge-Offs	0	(1,000)
Recoveries	0	11,000
Provision	1,000	1,000
Ending Balance	313,000	302,000
Consumer [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	243,000	228,000
Charge-Offs	(102,000)	(101,000)
Recoveries	25,000	32,000
Provision	23,000	123,000
Ending Balance	189,000	282,000
Other [Member]
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]
Beginning Balance	363,000	344,000
Charge-Offs	0	(4,000)
Recoveries	1,000	1,000
Provision	0	5,000
Ending Balance	$ 364,000	$ 346,000