Long-Term Debt (Schedule Of Subordinated Notes) (Details) (USD $) In Thousands, unless otherwise specified			0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 5.65% [Member]	Dec. 31, 2013 6.00% [Member]	Dec. 31, 2013 5.50% [Member]	Dec. 31, 2013 Subordinated Notes Interest Rate 5.65 Percent [Member]	Dec. 31, 2013 Subordinated Notes Interest Rate 6.95 Percent [Member]	Dec. 31, 2013 3mL+1.25% [Member]
Subordinated Borrowing [Line Items]
Convertible subordinated notes, Balance	$ 184,147	$ 308,468	$ 70,218	$ 60,107	$ 53,822
Convertible subordinated notes, Par amount	226,591		75,704	79,292	71,595
Subordinated notes, Balance	443,231	217,175	30,494	33,697	54,149	162,000	87,891	75,000	[1],[2]
Subordinated Notes Par Amount	$ 439,508		$ 30,173	$ 32,366	$ 52,078	$ 162,000	$ 87,891	$ 75,000	[1],[2]
Subordinated notes, Maturity			May 01, 2014	Sep. 01, 2015	Nov. 01, 2015	Nov. 01, 2023	Sep. 01, 2028	Sep. 01, 2014	[1],[2]

[1] Issued by Amegy.

[2] Designation of “3mL” is three-month LIBOR; effective interest rate at the beginning of the accrual period commencing on or before December 31, 2013 is shown in parenthesis.