Allowance for Loan Losses, Loans Modified as Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Troubled debt restructuring at end of period
Number of loans	70	79
Outstanding recorded investment	$ 16,604	$ 26,475
Troubled debt restructured during year
Number of Loans	24	44
Outstanding Recorded Balance, pre-modification	8,340	14,558
Outstanding Recorded Balance, Post modification	8,340	14,767
Defaulted Troubled Debt Restructurings [Member]
Troubled debt restructured during year
Number of Loans	4	11
Outstanding Recorded Balance, pre-modification	1,932	4,920
Commercial and Industrial [Member]
Troubled debt restructuring at end of period
Number of loans	41	52
Outstanding recorded investment	6,468	6,011
Troubled debt restructured during year
Number of Loans	17	29
Outstanding Recorded Balance, pre-modification	6,674	4,099
Outstanding Recorded Balance, Post modification	6,674	4,123
Commercial and Industrial [Member] | Defaulted Troubled Debt Restructurings [Member]
Troubled debt restructured during year
Number of Loans	2	9
Outstanding Recorded Balance, pre-modification	1,125	41
Commercial Real Estate [Member]
Troubled debt restructuring at end of period
Number of loans	9	9
Outstanding recorded investment	6,238	12,083
Troubled debt restructured during year
Number of Loans	0	8
Outstanding Recorded Balance, pre-modification	0	8,697
Outstanding Recorded Balance, Post modification	0	8,697
Commercial Real Estate [Member] | Defaulted Troubled Debt Restructurings [Member]
Troubled debt restructured during year
Number of Loans	0	2
Outstanding Recorded Balance, pre-modification	0	4,879
Residential Mortgages (1st and 2nd Liens) [Member]
Troubled debt restructuring at end of period
Number of loans	15	11
Outstanding recorded investment	3,587	2,986
Troubled debt restructured during year
Number of Loans	6	5
Outstanding Recorded Balance, pre-modification	1,617	1,437
Outstanding Recorded Balance, Post modification	1,617	1,622
Residential Mortgages (1st and 2nd Liens) [Member] | Defaulted Troubled Debt Restructurings [Member]
Troubled debt restructured during year
Number of Loans	2	0
Outstanding Recorded Balance, pre-modification	807	0
Real Estate Construction [Member]
Troubled debt restructuring at end of period
Number of loans	0	2
Outstanding recorded investment	0	5,183
Home Equity [Member]
Troubled debt restructured during year
Number of Loans	0	1
Outstanding Recorded Balance, pre-modification	0	291
Outstanding Recorded Balance, Post modification	0	291
Consumer [Member]
Troubled debt restructuring at end of period
Number of loans	5	5
Outstanding recorded investment	311	212
Troubled debt restructured during year
Number of Loans	1	1
Outstanding Recorded Balance, pre-modification	49	34
Outstanding Recorded Balance, Post modification	$ 49	$ 34