Commercial Mortgage Residual Interests (Schedule Of Amounts Recognized As Unrealized Gains And/Or Losses Recorded As Other Comprehensive Income And Other Than Temporary Valuation Impairments Recorded In Earnings) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Commercial Mortgage Residual Interests
Unrealized gains	$ 539	$ 35	$ 599	$ 127
Other than temporary valuation impairment	$ 267	$ 165	$ 396	$ 3,848