Loans, Past Due (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Recorded investment of past due [Abstract]
30 to 59 Days Past Due	2,512	$ 1,479
60 to 89 Days Past Due	698	822
90 Days Or Greater	2,566	2,850
Total Past Due	5,776	5,151
Current	559,403	548,954
Total Loans	565,179	554,105
90 Days and Accruing	403	836
Financing receivables on nonaccrual status [Abstract]
30 To 59 Days Past Due And Non-accrual	579	48
60 To 89 Days Past Due And Non-accrual	171	181
90 Days or more Past Due And Non-accrual	2,163	2,014
Total Past Due And Non-accrual	2,913	2,243
Current And Non-accrual	4,236	4,356
Financing receivable nonaccrual status	7,149	6,599
Financing receivables on accrual status [Abstract]
30 to 59 Days Past Due And Still Accruing	1,933	1,431
60 to 89 Days Past Due And Still Accruing	527	641
Total Past Due And Still Accruing	2,863	2,908
Current And Still Accruing	555,167	544,598
Total Financing Receivables And Still Accruing	558,030	547,506
Minimum [Member]
Financing receivables on nonaccrual status [Abstract]
Period of past due after which loans considered as non accrual	90 days
Mortgages [Member]
Recorded investment of past due [Abstract]
30 to 59 Days Past Due	438	318
60 to 89 Days Past Due	432	230
90 Days Or Greater	708	675
Total Past Due	1,578	1,223
Current	121,533	121,635
Total Loans	123,111	122,858
90 Days and Accruing	212	214
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	809	676
Home Equity [Member]
Recorded investment of past due [Abstract]
30 to 59 Days Past Due	333	442
60 to 89 Days Past Due	76	99
90 Days Or Greater	254	260
Total Past Due	663	801
Current	60,064	61,779
Total Loans	60,727	62,580
90 Days and Accruing	128	132
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	141	152
Commercial [Member]
Recorded investment of past due [Abstract]
30 to 59 Days Past Due	1,111	97
60 to 89 Days Past Due	0	231
90 Days Or Greater	1,257	1,432
Total Past Due	2,368	1,760
Current	190,333	189,185
Total Loans	192,701	190,945
90 Days and Accruing	44	310
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	5,030	5,010
Agricultural [Member]
Recorded investment of past due [Abstract]
30 to 59 Days Past Due	210	0
60 to 89 Days Past Due	0	0
90 Days Or Greater	0	0
Total Past Due	210	0
Current	25,481	24,639
Total Loans	25,691	24,639
90 Days and Accruing	0	0
Construction [Member]
Recorded investment of past due [Abstract]
30 to 59 Days Past Due	0	0
60 to 89 Days Past Due	0	0
90 Days Or Greater	0	0
Total Past Due	0	0
Current	6,036	6,353
Total Loans	6,036	6,353
90 Days and Accruing	0	0
Residential [Member]
Recorded investment of past due [Abstract]
Total Loans	183,838	185,438
Commercial and Agricultural [Member]
Recorded investment of past due [Abstract]
Total Loans	218,392	215,584
Consumer [Member]
Recorded investment of past due [Abstract]
30 to 59 Days Past Due	34	119
60 to 89 Days Past Due	32	4
90 Days Or Greater	12	7
Total Past Due	78	130
Current	8,093	8,367
Total Loans	8,171	8,497
90 Days and Accruing	1	6
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	57	47
Other Commercial Loans [Member]
Recorded investment of past due [Abstract]
30 to 59 Days Past Due	333	503
60 to 89 Days Past Due	158	258
90 Days Or Greater	335	476
Total Past Due	826	1,237
Current	51,780	46,214
Total Loans	52,606	47,451
90 Days and Accruing	18	174
Financing receivables on nonaccrual status [Abstract]
Financing receivable nonaccrual status	1,112	714
Other Agricultural Loans [Member]
Recorded investment of past due [Abstract]
30 to 59 Days Past Due	53	0
60 to 89 Days Past Due	0	0
90 Days Or Greater	0	0
Total Past Due	53	0
Current	10,727	11,065
Total Loans	10,780	11,065
90 Days and Accruing	0	0
State and Political Subdivision Loans [Member]
Recorded investment of past due [Abstract]
30 to 59 Days Past Due	0	0
60 to 89 Days Past Due	0	0
90 Days Or Greater	0	0
Total Past Due	0	0
Current	85,356	79,717
Total Loans	85,356	79,717
90 Days and Accruing	0	0
Commercial and Other Loans [Member]
Recorded investment of past due [Abstract]
Total Loans	63,386	$ 58,516