Loans (Troubled Debt Restructurings Subsequent Default) (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
Class of Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	6		11		7		14
Recorded Investment on Modifications with Subsequent Default	$ 1,111	[1]	$ 1,277	[1]	$ 1,306	[1]	$ 1,527	[1]
Commercial Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring					1		2
Recorded Investment on Modifications with Subsequent Default					195	[1]	215	[1]
Commercial Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	3		9		3		10
Recorded Investment on Modifications with Subsequent Default	428	[1]	894	[1]	428	[1]	929	[1]
Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	2		2		2		2
Recorded Investment on Modifications with Subsequent Default	670	[1]	383	[1]	670	[1]	383	[1]
Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	1		0		1		0
Recorded Investment on Modifications with Subsequent Default	$ 13	[1]	$ 0	[1]	$ 13	[1]	$ 0	[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.