Fair Value (Schedule Of Fair Value Of Predominantly Bank Trust Preferred CDOs) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Sep. 30, 2013
Financing Receivable, Recorded Investment [Line Items]
Fair value of predominantly bank trust preferred CDOs	$ 857,021
Percentage of total fair value by vintage	100.00%
AAA [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	63.80%
A [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	35.70%
BBB [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	0.50%
2001 [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value of predominantly bank trust preferred CDOs	36,497
Percentage of total fair value by vintage	4.20%
2001 [Member] | AAA [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	3.10%
2001 [Member] | A [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	1.10%
2001 [Member] | BBB [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	0.00%
2002 [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value of predominantly bank trust preferred CDOs	200,837
Percentage of total fair value by vintage	23.40%
2002 [Member] | AAA [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	20.80%
2002 [Member] | A [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	2.60%
2002 [Member] | BBB [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	0.00%
2003 [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value of predominantly bank trust preferred CDOs	326,412
Percentage of total fair value by vintage	38.20%
2003 [Member] | AAA [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	23.20%
2003 [Member] | A [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	14.90%
2003 [Member] | BBB [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	0.10%
2004 [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value of predominantly bank trust preferred CDOs	179,677
Percentage of total fair value by vintage	21.00%
2004 [Member] | AAA [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	8.30%
2004 [Member] | A [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	12.70%
2004 [Member] | BBB [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	0.00%
2005 [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value of predominantly bank trust preferred CDOs	15,816
Percentage of total fair value by vintage	1.80%
2005 [Member] | AAA [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	1.10%
2005 [Member] | A [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	0.70%
2005 [Member] | BBB [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	0.00%
2006 [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value of predominantly bank trust preferred CDOs	60,465
Percentage of total fair value by vintage	7.00%
2006 [Member] | AAA [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	2.90%
2006 [Member] | A [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	3.70%
2006 [Member] | BBB [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	0.40%
2007 [Member]
Financing Receivable, Recorded Investment [Line Items]
Fair value of predominantly bank trust preferred CDOs	$ 37,317
Percentage of total fair value by vintage	4.40%
2007 [Member] | AAA [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	4.40%
2007 [Member] | A [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	0.00%
2007 [Member] | BBB [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total fair value	0.00%