Credit Quality Assessment (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Credit quality indicators	$ 298,814	$ 276,531	$ 271,209
Not Classified [Member]
Credit quality indicators	296,217	270,650
Special Mention [Member]
Credit quality indicators	0	0
Substandard [Member]
Credit quality indicators	2,597	5,881
Doubtful [Member]
Credit quality indicators	0	0
Construction and Land [Member]
Credit quality indicators	35,889	39,268	36,809
Construction and Land [Member] | Not Classified [Member]
Credit quality indicators	35,457	39,268
Construction and Land [Member] | Special Mention [Member]
Credit quality indicators	0	0
Construction and Land [Member] | Substandard [Member]
Credit quality indicators	432	0
Construction and Land [Member] | Doubtful [Member]
Credit quality indicators	0	0
Residential First Lien [Member]
Credit quality indicators	23,074	22,087	23,365
Residential First Lien [Member] | Not Classified [Member]
Credit quality indicators	22,841	21,476
Residential First Lien [Member] | Special Mention [Member]
Credit quality indicators	0	0
Residential First Lien [Member] | Substandard [Member]
Credit quality indicators	233	611
Residential First Lien [Member] | Doubtful [Member]
Credit quality indicators	0	0
Residential Junior Lien [Member]
Credit quality indicators	8,162	9,242	10,089
Residential Junior Lien [Member] | Not Classified [Member]
Credit quality indicators	8,162	9,198
Residential Junior Lien [Member] | Special Mention [Member]
Credit quality indicators	0	0
Residential Junior Lien [Member] | Substandard [Member]
Credit quality indicators	0	44
Residential Junior Lien [Member] | Doubtful [Member]
Credit quality indicators	0	0
Commercial Owner Occupied [Member]
Credit quality indicators	58,793	46,588	46,513
Commercial Owner Occupied [Member] | Not Classified [Member]
Credit quality indicators	58,793	44,600
Commercial Owner Occupied [Member] | Special Mention [Member]
Credit quality indicators	0	0
Commercial Owner Occupied [Member] | Substandard [Member]
Credit quality indicators	0	1,988
Commercial Owner Occupied [Member] | Doubtful [Member]
Credit quality indicators	0	0
Commercial Non Owner Occupied [Member]
Credit quality indicators	86,116	76,880	70,816
Commercial Non Owner Occupied [Member] | Not Classified [Member]
Credit quality indicators	85,726	76,880
Commercial Non Owner Occupied [Member] | Special Mention [Member]
Credit quality indicators	0	0
Commercial Non Owner Occupied [Member] | Substandard [Member]
Credit quality indicators	390	0
Commercial Non Owner Occupied [Member] | Doubtful [Member]
Credit quality indicators	0	0
Commercial Loan and Leases [Member]
Credit quality indicators	85,409	81,243	82,405
Commercial Loan and Leases [Member] | Not Classified [Member]
Credit quality indicators	83,867	78,014
Commercial Loan and Leases [Member] | Special Mention [Member]
Credit quality indicators	0	0
Commercial Loan and Leases [Member] | Substandard [Member]
Credit quality indicators	1,542	3,229
Commercial Loan and Leases [Member] | Doubtful [Member]
Credit quality indicators	0	0
Consumer Loan [Member]
Credit quality indicators	1,371	1,223	1,212
Consumer Loan [Member] | Not Classified [Member]
Credit quality indicators	1,371	1,214
Consumer Loan [Member] | Special Mention [Member]
Credit quality indicators	0	0
Consumer Loan [Member] | Substandard [Member]
Credit quality indicators	0	9
Consumer Loan [Member] | Doubtful [Member]
Credit quality indicators	$ 0	$ 0