Loans, Non-accrual and Past Due Loans (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Non-accrual and Past Due Loans [Abstract]
Non-accrual loans	$ 7,268	$ 8,710
Age analysis of past due loans [Abstract]
30-59 Days Past Due	4,158	2,136
60-89 Days Past Due	850	3,544
90 Days or more Past Due	1,197	2,249
Total Past Due	6,205	7,929
Current	442,023	435,070
Total	448,228	442,999
Loans 90 days past due and still accruing	0	0
Commercial [Member]
Non-accrual and Past Due Loans [Abstract]
Non-accrual loans	2,853	2,905
Number of loans impaired by classification	11	12
Age analysis of past due loans [Abstract]
30-59 Days Past Due	2,255	1,051
60-89 Days Past Due	0	166
90 Days or more Past Due	170	113
Total Past Due	2,425	1,330
Current	86,385	90,584
Total	88,810	91,914
Commercial Real Estate [Member]
Non-accrual and Past Due Loans [Abstract]
Non-accrual loans	1,879	3,071
Number of loans impaired by classification	5	6
Age analysis of past due loans [Abstract]
30-59 Days Past Due	1,272	0
60-89 Days Past Due	0	2,746
90 Days or more Past Due	566	446
Total Past Due	1,838	3,192
Current	186,588	172,601
Total	188,426	175,793
Agriculture [Member]
Non-accrual and Past Due Loans [Abstract]
Non-accrual loans	0	992
Number of loans impaired by classification		1
Age analysis of past due loans [Abstract]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
90 Days or more Past Due	0	991
Total Past Due	0	991
Current	52,747	51,073
Total	52,747	52,064
Residential Mortgage [Member]
Non-accrual and Past Due Loans [Abstract]
Non-accrual loans	2,095	1,334
Number of loans impaired by classification	7	4
Age analysis of past due loans [Abstract]
30-59 Days Past Due	570	792
60-89 Days Past Due	103	420
90 Days or more Past Due	335	426
Total Past Due	1,008	1,638
Current	50,258	49,948
Total	51,266	51,586
Residential Construction [Member]
Non-accrual and Past Due Loans [Abstract]
Non-accrual loans	0	48
Number of loans impaired by classification		1
Age analysis of past due loans [Abstract]
30-59 Days Past Due	53	273
60-89 Days Past Due	0	0
90 Days or more Past Due	0	48
Total Past Due	53	321
Current	7,533	7,171
Total	7,586	7,492
Consumer [Member]
Non-accrual and Past Due Loans [Abstract]
Non-accrual loans	441	360
Number of loans impaired by classification	7	5
Age analysis of past due loans [Abstract]
30-59 Days Past Due	8	20
60-89 Days Past Due	747	212
90 Days or more Past Due	126	225
Total Past Due	881	457
Current	58,512	63,693
Total	$ 59,393	$ 64,150