Derivative Instruments And Hedging Activities , Balance Sheet Location (Details) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 0	$ 0
Liability Derivatives	847,000	1,106,000
Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives		0
Collateral deposits recorded in other assets	2,000,000	3,100,000
Other liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives		$ 1,106,000