Fair Value Measurements (Schedule Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Level 3, beginning of period	$ 31,572		$ 30,976		$ 116,280		$ 32,814
Transfers out of Level 3	0	[1],[2]	0	[1],[2]	(248,844)	[1],[2]	(975)	[1],[2]
Change in unrealized loss included in other comprehensive income	7,194		1,587		14,194		2,279
Unrealized loss included in net income	(70)		(539)		(355)		(1,161)
Realized gain on sale of available for sale securities	269		0		269		0
Purchases/capital calls	0		0		159,412		126
Sales/proceeds	(7,740)		0		(7,740)		0
Accretion/amortization	26		63		214		79
Calls/paydowns	(483)		(2,219)		(2,662)		(3,294)
Level 3, end of period	$ 30,768		$ 29,868		$ 30,768		$ 29,868

[1] As of April 1, 2013, the CLO portfolio was transferred from Level 3 to Level 2 based on having more observable inputs in determining fair value. In prior quarters, the CLO portfolio was priced using average non-binding broker quotes. During the second quarter, the Company engaged a third-party pricing vendor to provide monthly fair value measurements. The methodology used is a combination of matrix pricing, observed market activity and metrics. Pricing inputs such as credit spreads are observable and market corroborated and, therefore, the CLO portfolio qualifies for Level 2 categorization. The market for these CLOs is active and there is ample price transparency.

[2] As of January 1, 2012, auction rate preferred securities were transferred from Level 3 to Level 2. These securities are considered to be Level 2 based upon observable market activity at full par value for recent transactions.