Loans, Past Due (Details) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Minimum [Member]	Jun. 30, 2013 Loans Considered Non-Accrual [Member]	Dec. 31, 2012 Loans Considered Non-Accrual [Member]	Jun. 30, 2013 Loans Still Accruing [Member]	Dec. 31, 2012 Loans Still Accruing [Member]	Jun. 30, 2013 Real Estate Loans [Member] Mortgages [Member]	Dec. 31, 2012 Real Estate Loans [Member] Mortgages [Member]	Jun. 30, 2013 Real Estate Loans [Member] Commercial and Agricultural [Member]	Dec. 31, 2012 Real Estate Loans [Member] Commercial and Agricultural [Member]	Jun. 30, 2013 Real Estate Loans [Member] Mortgages [Member]	Dec. 31, 2012 Real Estate Loans [Member] Mortgages [Member]	Jun. 30, 2013 Real Estate Loans [Member] Home Equity [Member]	Dec. 31, 2012 Real Estate Loans [Member] Home Equity [Member]	Jun. 30, 2013 Real Estate Loans [Member] Commercial [Member]	Dec. 31, 2012 Real Estate Loans [Member] Commercial [Member]	Jun. 30, 2013 Real Estate Loans [Member] Agricultural [Member]	Dec. 31, 2012 Real Estate Loans [Member] Agricultural [Member]	Jun. 30, 2013 Real Estate Loans [Member] Construction [Member]	Dec. 31, 2012 Real Estate Loans [Member] Construction [Member]	Jun. 30, 2013 Consumer [Member]	Dec. 31, 2012 Consumer [Member]	Jun. 30, 2013 Other Agricultural Loans [Member]	Dec. 31, 2012 Other Agricultural Loans [Member]	Jun. 30, 2013 State and Political Subdivision Loans [Member]	Dec. 31, 2012 State and Political Subdivision Loans [Member]	Jun. 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	$ 1,961	$ 2,566		$ 108	$ 73	$ 1,853	$ 2,493					$ 443	$ 636	$ 389	$ 267	$ 158	$ 602	$ 0	$ 54	$ 0	$ 0	$ 58	$ 45	$ 49	$ 0	$ 0	$ 0	$ 864	$ 962
60 to 89 Days Past Due	333	354		0	69	333	285					214	294	117	17	0	0	0	0	0	0	1	43	0	0	0	0	1	0
90 Days Or Greater	3,409	3,185		3,156	2,679	253	506					450	493	140	222	2,496	2,149	0	0	0	0	0	4	0	0	0	0	323	317
Total Past Due	5,703	6,105		3,264	2,821	2,439	3,284					1,107	1,423	646	506	2,654	2,751	0	54	0	0	59	92	49	0	0	0	1,188	1,279
Current	510,033	496,358		4,942	5,246	505,091	491,112					110,833	105,125	68,196	71,026	175,826	173,959	19,647	17,961	13,455	12,011	10,003	10,467	9,366	6,260	59,237	59,208	43,470	40,341
Total Loans	515,736	502,463		8,206	8,067	507,530	494,396	180,782	178,080	198,127	194,725	111,940	106,548	68,842	71,532	178,480	176,710	19,647	18,015	13,455	12,011	10,062	10,559	9,415	6,260	59,237	59,208	44,658	41,620
90 Days and Accruing	253	506										63	244	38	88	137	152	0	0	0	0	0	4	0	0	0	0	15	18
Period of past due after which loans considered as non accrual			90 days
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	$ 8,206	$ 8,067										$ 482	$ 482	$ 127	$ 181	$ 7,241	$ 7,042	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 356	$ 362