Loans, Impaired Financing Receivable (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	$ 10,959		$ 10,959		$ 12,076
Recorded Investment With No Allowance	6,835		6,835		8,232
Recorded Investment With Allowance	1,764		1,764		2,168
Total Recorded Investment	8,599		8,599		10,400
Related Allowance	158		158		333
Average Recorded Investment	9,050	10,508	9,943	10,735
Interest income recognized on impaired loans	41	362	137	493
Interest income recognized on a cash basis on impaired loans	0	326	0	361
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	224		224		232
Recorded Investment With No Allowance	128		128		138
Recorded Investment With Allowance	67		67		70
Total Recorded Investment	195		195		208
Related Allowance	13		13		14
Average Recorded Investment	197	349	201	336
Interest income recognized on impaired loans	3	2	7	6
Interest income recognized on a cash basis on impaired loans	0	0	0	0
Home Equity [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	131		131		134
Recorded Investment With No Allowance	63		63		65
Recorded Investment With Allowance	66		66		69
Total Recorded Investment	129		129		134
Related Allowance	12		12		13
Average Recorded Investment	130	135	131	136
Interest income recognized on impaired loans	1	1	3	3
Interest income recognized on a cash basis on impaired loans	0	0	0	0
Commercial [Member]
Impaired Financing Receivable [Abstract]
Unpaid Principal Balance	8,584		8,584		9,901
Recorded Investment With No Allowance	5,456		5,456		6,335
Recorded Investment With Allowance	877		877		1,975
Total Recorded Investment	6,333		6,333		8,310
Related Allowance	97		97		305
Average Recorded Investment	6,770	8,372	7,616	8,521
Interest income recognized on impaired loans	22	342	66	426
Interest income recognized on a cash basis on impaired loans	0	326	0	361
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	0		0		15
Recorded Investment With No Allowance	0		0		15
Recorded Investment With Allowance	0		0		0
Total Recorded Investment	0		0		15
Related Allowance	0		0		0
Average Recorded Investment	10	5	13	2
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	2,020		2,020		1,794
Recorded Investment With No Allowance	1,188		1,188		1,679
Recorded Investment With Allowance	754		754		54
Total Recorded Investment	1,942		1,942		1,733
Related Allowance	36		36		1
Average Recorded Investment	1,943	1,647	1,982	1,740
Interest income recognized on impaired loans	15	17	61	58
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