Loans (Troubled Debt Restructurings Subsequent Default) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Class of Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	5		12		5		15
Recorded Investment on Modifications with Subsequent Default	$ 756	[1]	$ 1,743	[1]	$ 756	[1]	$ 2,187	[1]
Commercial Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	1		2		1		2
Recorded Investment on Modifications with Subsequent Default	197	[1]	196	[1]	197	[1]	196	[1]
Commercial Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	2		7		2		8
Recorded Investment on Modifications with Subsequent Default	52	[1]	341	[1]	52	[1]	395	[1]
Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans Modified as a Troubled Debt Restructuring	1		3		1		5
Recorded Investment on Modifications with Subsequent Default	495	[1]	1,206	[1]	495	[1]	1,596	[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	$ 12	[1]	$ 0	[1]	$ 12	[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.