Investment Securities (Schedule Of OTTI For Single Issuer Trust Preferred Securities) (Detail) (USD $) In Thousands, unless otherwise specified				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Single issuer trust preferred securities [Member]	Dec. 31, 2013 Single issuer trust preferred securities [Member] Security B [Member]		Dec. 31, 2013 Single issuer trust preferred securities [Member] Security C [Member]		Dec. 31, 2013 Single issuer trust preferred securities [Member] Security E [Member]		Dec. 31, 2013 Single issuer trust preferred securities [Member] Security F [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized Cost	$ 3,110,912	$ 3,069,182	$ 41,807	$ 6,932		$ 8,716		$ 11,817		$ 14,342
Gross Unrealized Losses	(61,626)	(31,489)	(6,872)	(1,007)		(1,316)		(1,727)		(2,822)
Fair Value			$ 34,935	$ 5,925		$ 7,400		$ 10,090		$ 11,520
Lowest Credit Ratings				BB	[1]	BBB	[1]	BBB	[1]	BBB	[1]

[1] The Company utilized credit ratings provided by Moody’s and S&P in its evaluation of issuers.