Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Summarizes non-accrual loans by loan class
Non-accrual Loans principal balance	$ 14,356	$ 80,760
Percentage of Total	100.00%	100.00%
Total Loans (1)	766,569	969,654
Percentage of Total Loans	1.90%	8.30%
Commercial and industrial loans [Member]
Summarizes non-accrual loans by loan class
Non-accrual Loans principal balance	5,963	16,867
Percentage of Total	41.60%	20.90%
Total Loans (1)	177,077	206,652
Percentage of Total Loans	0.80%	1.70%
Commercial real estate mortgages [Member]
Summarizes non-accrual loans by loan class
Non-accrual Loans principal balance	5,893	45,344
Percentage of Total	41.00%	56.20%
Total Loans (1)	340,581	428,646
Percentage of Total Loans	0.80%	4.70%
Real estate construction loans [Member]
Summarizes non-accrual loans by loan class
Non-accrual Loans principal balance	1,334	6,978
Percentage of Total	9.30%	8.60%
Total Loans (1)	23,781	49,704
Percentage of Total Loans	0.20%	0.70%
Residential mortgages (1st and 2nd liens) [Member]
Summarizes non-accrual loans by loan class
Non-accrual Loans principal balance	1,031	7,028
Percentage of Total	7.20%	8.70%
Total Loans (1)	138,934	160,619
Percentage of Total Loans	0.10%	0.70%
Home equity loans [Member]
Summarizes non-accrual loans by loan class
Non-accrual Loans principal balance		3,897
Percentage of Total		4.80%
Total Loans (1)	70,276	79,684
Percentage of Total Loans	0.00%	0.40%
Consumer and other loans [Member]
Summarizes non-accrual loans by loan class
Non-accrual Loans principal balance	135	646
Percentage of Total	0.90%	0.80%
Total Loans (1)	15,539	43,806
Percentage of Total Loans	0.00%	0.10%
Other loans [Member]
Summarizes non-accrual loans by loan class
Non-accrual Loans principal balance		0
Percentage of Total		0.00%
Total Loans (1)	$ 381	$ 543
Percentage of Total Loans	0.00%	0.00%