Loans (Troubled Debt Restructurings) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 loan		Dec. 31, 2011 loan
Commercial Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	6		2
Outstanding Recorded Investment, Pre-Modifications	$ 9,525	[1]	$ 215	[1]
Outstanding Recorded Investment, Post-Modifications	9,525	[1]	215	[1]
Commercial Construction and Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	0		0
Outstanding Recorded Investment, Pre-Modifications	0	[1]	0	[1]
Outstanding Recorded Investment, Post-Modifications	0	[1]	0	[1]
Commercial Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	8		13
Outstanding Recorded Investment, Pre-Modifications	1,889	[1]	6,619	[1]
Outstanding Recorded Investment, Post-Modifications	1,889	[1]	6,619	[1]
Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	2		8
Outstanding Recorded Investment, Pre-Modifications	651	[1]	2,127	[1]
Outstanding Recorded Investment, Post-Modifications	651	[1]	2,127	[1]
Homeowner Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	0		0
Outstanding Recorded Investment, Pre-Modifications	0	[1]	0	[1]
Outstanding Recorded Investment, Post-Modifications	0	[1]	0	[1]
Home Equity Lines [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	0		0
Outstanding Recorded Investment, Pre-Modifications	0	[1]	0	[1]
Outstanding Recorded Investment, Post-Modifications	0	[1]	0	[1]
Home Equity Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	0		1
Outstanding Recorded Investment, Pre-Modifications	0	[1]	28	[1]
Outstanding Recorded Investment, Post-Modifications	0	[1]	28	[1]
Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	2		2
Outstanding Recorded Investment, Pre-Modifications	5	[1]	131	[1]
Outstanding Recorded Investment, Post-Modifications	5	[1]	131	[1]
Class of Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	18		26
Outstanding Recorded Investment, Pre-Modifications	12,070	[1]	9,120	[1]
Outstanding Recorded Investment, Post-Modifications	$ 12,070	[1]	$ 9,120	[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, at the time of the restructuring. For accruing troubled debt restructurings the recorded investment also includes accrued interest.