Loans (Troubled Debt Restructurings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 loan		Mar. 31, 2012 loan
Commercial Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	2		2
Pre-Modification Recorded Investment	$ 452	[1]	$ 664	[1]
Post-Modification Recorded Investment	372	[1]	664	[1]
Commercial Construction and Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	0		0
Pre-Modification Recorded Investment	0	[1]	0	[1]
Post-Modification Recorded Investment	0	[1]	0	[1]
Commercial Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	0		5
Pre-Modification Recorded Investment	0	[1]	1,250	[1]
Post-Modification Recorded Investment	0	[1]	1,250	[1]
Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	0		0
Pre-Modification Recorded Investment	0	[1]	0	[1]
Post-Modification Recorded Investment	0	[1]	0	[1]
Homeowner Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	0		0
Pre-Modification Recorded Investment	0	[1]	0	[1]
Post-Modification Recorded Investment	0	[1]	0	[1]
Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	1		0
Pre-Modification Recorded Investment	92	[1]	0	[1]
Post-Modification Recorded Investment	92	[1]	0	[1]
Home Equity Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	0		0
Pre-Modification Recorded Investment	0	[1]	0	[1]
Post-Modification Recorded Investment	0	[1]	0	[1]
Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	0		2
Pre-Modification Recorded Investment	0	[1]	5	[1]
Post-Modification Recorded Investment	0	[1]	5	[1]
Class of Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	3		9
Pre-Modification Recorded Investment	544	[1]	1,919	[1]
Post-Modification Recorded Investment	$ 464	[1]	$ 1,919	[1]

[1] The recorded investment in troubled debt restructurings consists of unpaid principal balance, net of charge-offs and unamortized deferred loan origination fees and costs. For accruing troubled debt restructured loans, the recorded investment also includes accrued interest.