Loans and Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Allowance for loan losses:
Balance, beginning of period	$ 17,115	$ 17,135	$ 17,063	$ 16,136
Losses charged off	(1,621)	(3,499)	(3,697)	(4,611)
Recoveries	139	190	367	381
Provision charged to expense	1,667	3,345	3,567	5,445
Balance, end of period	17,300	17,351	17,300	17,351
Ending allowance balance attributable to loans:
Individually evaluated for impairment	3,298	6,070	3,298	6,070
Collectively evaluated for impairment	14,002	11,281	14,002	11,281
Total ending allowance balance	17,300	17,351	17,300	17,351
Loans:
Individually evaluated for impairment	29,569	38,246	29,569	38,246
Collectively evaluated for impairment	837,890	792,066	837,890	792,066
Total ending loans balance	867,459	830,312	867,459	830,312	843,088
Commercial Real Estate [Member]
Allowance for loan losses:
Balance, beginning of period	11,651	12,003	10,714	11,127
Losses charged off	(340)	(1,862)	(1,319)	(2,092)
Recoveries	10	114	30	216
Provision charged to expense	75	1,426	1,971	2,430
Balance, end of period	11,396	11,681	11,396	11,681
Ending allowance balance attributable to loans:
Individually evaluated for impairment	3,181	5,602	3,181	5,602
Collectively evaluated for impairment	8,215	6,079	8,215	6,079
Total ending allowance balance	11,396	11,681	11,396	11,681
Loans:
Individually evaluated for impairment	28,102	35,349	28,102	35,349
Collectively evaluated for impairment	370,149	351,542	370,149	351,542
Total ending loans balance	398,251	386,891	398,251	386,891	381,852
Commercial [Member]
Allowance for loan losses:
Balance, beginning of period	585	1,151	1,409	1,317
Losses charged off	(165)	(224)	(165)	(224)
Recoveries	3	4	20	35
Provision charged to expense	417	251	(424)	54
Balance, end of period	840	1,182	840	1,182
Ending allowance balance attributable to loans:
Individually evaluated for impairment	80	166	80	166
Collectively evaluated for impairment	760	1,016	760	1,016
Total ending allowance balance	840	1,182	840	1,182
Loans:
Individually evaluated for impairment	306	771	306	771
Collectively evaluated for impairment	79,155	71,908	79,155	71,908
Total ending loans balance	79,461	72,679	79,461	72,679	76,570
Residential Real Estate [Member]
Allowance for loan losses:
Balance, beginning of period	1,574	926	1,331	805
Losses charged off	(508)	(753)	(975)	(1,026)
Recoveries	16	6	83	10
Provision charged to expense	634	1,070	1,277	1,460
Balance, end of period	1,716	1,249	1,716	1,249
Ending allowance balance attributable to loans:
Individually evaluated for impairment	37	302	37	302
Collectively evaluated for impairment	1,679	947	1,679	947
Total ending allowance balance	1,716	1,249	1,716	1,249
Loans:
Individually evaluated for impairment	1,161	2,126	1,161	2,126
Collectively evaluated for impairment	63,673	66,711	63,673	66,711
Total ending loans balance	64,834	68,837	64,834	68,837	64,524
Home Equity Loans [Member]
Allowance for loan losses:
Balance, beginning of period	2,298	1,940	2,289	1,512
Losses charged off	(152)	(341)	(555)	(686)
Recoveries	11	1	15	2
Provision charged to expense	(11)	291	397	1,063
Balance, end of period	2,146	1,891	2,146	1,891
Ending allowance balance attributable to loans:
Collectively evaluated for impairment	2,146	1,891	2,146	1,891
Total ending allowance balance	2,146	1,891	2,146	1,891
Loans:
Collectively evaluated for impairment	126,568	130,143	126,568	130,143
Total ending loans balance	126,568	130,143	126,568	130,143	126,958
Indirect [Member]
Allowance for loan losses:
Balance, beginning of period	807	902	891	904
Losses charged off	(399)	(143)	(577)	(338)
Recoveries	87	47	190	72
Provision charged to expense	490	115	481	283
Balance, end of period	985	921	985	921
Ending allowance balance attributable to loans:
Collectively evaluated for impairment	985	921	985	921
Total ending allowance balance	985	921	985	921
Loans:
Collectively evaluated for impairment	184,892	158,885	184,892	158,885
Total ending loans balance	184,892	158,885	184,892	158,885	180,089
Consumer [Member]
Allowance for loan losses:
Balance, beginning of period	200	393	429	471
Losses charged off	(57)	(176)	(106)	(245)
Recoveries	12	18	29	46
Provision charged to expense	62	192	(135)	155
Balance, end of period	217	427	217	427
Ending allowance balance attributable to loans:
Collectively evaluated for impairment	217	427	217	427
Total ending allowance balance	217	427	217	427
Loans:
Collectively evaluated for impairment	13,453	12,877	13,453	12,877
Total ending loans balance	$ 13,453	$ 12,877	$ 13,453	$ 12,877	$ 13,095