Loans, Impaired Financing Receivable (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	$ 12,191		$ 12,191		$ 12,076
Recorded Investment With No Allowance	7,805		7,805		8,232
Recorded Investment With Allowance	1,932		1,932		2,168
Total Recorded Investment	9,737		9,737		10,400
Related Allowance	158		158		333
Average Recorded Investment	9,998	10,810	10,388	10,848
Interest income recognized on impaired loans	34	64	96	131
Interest income recognized on a cash basis on impaired loans	0	21	0	35
Construction [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	0		0		0
Recorded Investment With No Allowance	0		0		0
Recorded Investment With Allowance	0		0		0
Total Recorded Investment	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0	0	0	0
Interest income recognized on impaired loans	0	0	0	0
Interest income recognized on a cash basis on impaired loans	0	0	0	0
Mortgages [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	226		226		232
Recorded Investment With No Allowance	131		131		138
Recorded Investment With Allowance	68		68		70
Total Recorded Investment	199		199		208
Related Allowance	14		14		14
Average Recorded Investment	200	352	202	330
Interest income recognized on impaired loans	2	2	4	4
Interest income recognized on a cash basis on impaired loans	0	0	0	0
Home Equity [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	132		132		134
Recorded Investment With No Allowance	64		64		65
Recorded Investment With Allowance	67		67		69
Total Recorded Investment	131		131		134
Related Allowance	13		13		13
Average Recorded Investment	131	136	132	137
Interest income recognized on impaired loans	1	1	2	2
Interest income recognized on a cash basis on impaired loans	0	0	0	0
Commercial [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	9,283		9,283		9,901
Recorded Investment With No Allowance	6,161		6,161		6,335
Recorded Investment With Allowance	908		908		1,975
Total Recorded Investment	7,069		7,069		8,310
Related Allowance	101		101		305
Average Recorded Investment	7,544	8,406	8,039	8,595
Interest income recognized on impaired loans	18	39	44	84
Interest income recognized on a cash basis on impaired loans	0	21	0	35
Agricultural [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	0		0		0
Recorded Investment With No Allowance	0		0		0
Recorded Investment With Allowance	0		0		0
Total Recorded Investment	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0	0	0	0
Interest income recognized on impaired loans	0	0	0	0
Interest income recognized on a cash basis on impaired loans	0	0	0	0
Consumer [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	15		15		15
Recorded Investment With No Allowance	15		15		15
Recorded Investment With Allowance	0		0		0
Total Recorded Investment	15		15		15
Related Allowance	0		0		0
Average Recorded Investment	15	0	15	0
Interest income recognized on impaired loans	0	0	0	0
Interest income recognized on a cash basis on impaired loans	0	0	0	0
Other Commercial Loans [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	2,535		2,535		1,794
Recorded Investment With No Allowance	1,434		1,434		1,679
Recorded Investment With Allowance	889		889		54
Total Recorded Investment	2,323		2,323		1,733
Related Allowance	30		30		1
Average Recorded Investment	2,108	1,916	2,000	1,786
Interest income recognized on impaired loans	13	22	46	41
Interest income recognized on a cash basis on impaired loans	0	0	0	0
Other Agricultural Loans [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	0		0		0
Recorded Investment With No Allowance	0		0		0
Recorded Investment With Allowance	0		0		0
Total Recorded Investment	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0	0	0	0
Interest income recognized on impaired loans	0	0	0	0
Interest income recognized on a cash basis on impaired loans	0	0	0	0
State and Political Subdivision Loans [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	0		0		0
Recorded Investment With No Allowance	0		0		0
Recorded Investment With Allowance	0		0		0
Total Recorded Investment	0		0		0
Related Allowance	0		0		0
Average Recorded Investment	0	0	0	0
Interest income recognized on impaired loans	0	0	0	0
Interest income recognized on a cash basis on impaired loans	$ 0	$ 0	$ 0	$ 0