Loans (Troubled Debt Restructurings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Commercial Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	2		0		5		2
Pre-Modification Recorded Investment	$ 8,183	[1]	$ 0	[1]	$ 9,044	[1]	$ 215	[1]
Post-Modification Recorded Investment	8,183	[1]	0	[1]	9,044	[1]	215	[1]
Commercial Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring					7		7
Pre-Modification Recorded Investment					1,625	[1]	1,293	[1]
Post-Modification Recorded Investment					1,625	[1]	1,293	[1]
Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	0		1		2		6
Pre-Modification Recorded Investment	0	[1]	139	[1]	651	[1]	1,449	[1]
Post-Modification Recorded Investment	0	[1]	139	[1]	651	[1]	1,449	[1]
Home Equity Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	0		1		0		1
Pre-Modification Recorded Investment	0	[1]	28	[1]	0	[1]	28	[1]
Post-Modification Recorded Investment	0	[1]	28	[1]	0	[1]	0	[1]
Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring					2		1
Pre-Modification Recorded Investment					5	[1]	117	[1]
Post-Modification Recorded Investment					5	[1]	145	[1]
Class of Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	2		2		16		17
Pre-Modification Recorded Investment	8,183	[1]	167	[1]	11,325	[1]	3,102	[1]
Post-Modification Recorded Investment	$ 8,183	[1]	$ 167	[1]	$ 11,325	[1]	$ 3,102	[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.