Loans, Past Due (Details) (USD $) In Thousands, unless otherwise specified			9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Minimum [Member]	Sep. 30, 2013 Loans Considered Non-Accrual [Member]	Dec. 31, 2012 Loans Considered Non-Accrual [Member]	Sep. 30, 2013 Loans Still Accruing [Member]	Dec. 31, 2012 Loans Still Accruing [Member]	Sep. 30, 2013 Real Estate Loans [Member] Residential [Member]	Dec. 31, 2012 Real Estate Loans [Member] Residential [Member]	Sep. 30, 2013 Real Estate Loans [Member] Commercial and Agricultural [Member]	Dec. 31, 2012 Real Estate Loans [Member] Commercial and Agricultural [Member]	Sep. 30, 2013 Real Estate Loans [Member] Mortgages [Member]	Dec. 31, 2012 Real Estate Loans [Member] Mortgages [Member]	Sep. 30, 2013 Real Estate Loans [Member] Home Equity [Member]	Dec. 31, 2012 Real Estate Loans [Member] Home Equity [Member]	Sep. 30, 2013 Real Estate Loans [Member] Commercial [Member]	Dec. 31, 2012 Real Estate Loans [Member] Commercial [Member]	Sep. 30, 2013 Real Estate Loans [Member] Agricultural [Member]	Dec. 31, 2012 Real Estate Loans [Member] Agricultural [Member]	Sep. 30, 2013 Real Estate Loans [Member] Construction [Member]	Dec. 31, 2012 Real Estate Loans [Member] Construction [Member]	Sep. 30, 2013 Consumer [Member]	Dec. 31, 2012 Consumer [Member]	Sep. 30, 2013 Other Agricultural Loans [Member]	Dec. 31, 2012 Other Agricultural Loans [Member]	Sep. 30, 2013 State and Political Subdivision Loans [Member]	Dec. 31, 2012 State and Political Subdivision Loans [Member]	Sep. 30, 2013 Other Commercial Loans [Member]	Dec. 31, 2012 Other Commercial Loans [Member]
Recorded investment of past due [Abstract]
30 to 59 Days Past Due	$ 2,848	$ 2,566		$ 127	$ 73	$ 2,721	$ 2,493					$ 935	$ 636	$ 539	$ 267	$ 1,186	$ 602	$ 125	$ 54	$ 0	$ 0	$ 46	$ 45	$ 0	$ 0	$ 0	$ 0	$ 17	$ 962
60 to 89 Days Past Due	641	354		425	69	216	285					140	294	137	17	283	0	0	0	0	0	16	43	0	0	0	0	65	0
90 Days Or Greater	4,200	3,185		3,612	2,679	588	506					600	493	230	222	3,019	2,149	0	0	0	0	0	4	0	0	0	0	351	317
Total Past Due	7,689	6,105		4,164	2,821	3,525	3,284					1,675	1,423	906	506	4,488	2,751	125	54	0	0	62	92	0	0	0	0	433	1,279
Current	514,643	496,358		4,533	5,246	510,110	491,112					113,334	105,125	67,455	71,026	171,045	173,959	20,788	17,961	18,272	12,011	9,917	10,467	9,280	6,260	60,105	59,208	44,447	40,341
Total Loans	522,332	502,463		8,697	8,067	513,635	494,396	183,370	178,080	196,446	194,725	115,009	106,548	68,361	71,532	175,533	176,710	20,913	18,015	18,272	12,011	9,979	10,559	9,280	6,260	60,105	59,208	44,880	41,620
90 Days and Accruing	588	506										195	244	94	88	299	152	0	0	0	0	0	4	0	0	0	0	0	18
Period of past due after which loans considered as non accrual			90 days
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	$ 8,697	$ 8,067										$ 523	$ 482	$ 178	$ 181	$ 7,521	$ 7,042	$ 0	$ 0	$ 0	$ 0	$ 15	$ 0	$ 0	$ 0	$ 0	$ 0	$ 460	$ 362