Investment Securities (Investment Securities With Unrealized Losses By Aggregated Major Security Type And Length Of Time In A Continuous Unrealized Loss Position) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Available-for-Sale, Less than 12 Months, Fair Value	$ 150,931	$ 412,128
Available-for-Sale, Less than 12 Months, Unrealized Losses	(1,084)	(7,364)
Available-for-Sale, 12 months or longer, Fair Value	75,786	94,414
Available-for-Sale, 12 months or longer, Unrealized Losses	(25,322)	(27,502)
Available-for-Sale, Fair Value	226,717	506,542
Available-for-Sale, Unrealized Losses	(26,406)	(34,866)
Held-to-Maturity, Less than 12 Months, Fair Value	0	382,905
Held-to-Maturity, Less than 12 Months, Unrealized Losses	0	(17,216)
Held-to-Maturity, 12 months or longer, Fair Value	13,324	375
Held-to-Maturity, 12 months or longer, Unrealized Losses	(107)	(176)
Held-to-maturity, Fair Value	13,324	383,280
Held-to-Maturity, Unrealized Losses	(107)	(17,392)
U.S. Treasury [Member]
Available-for-Sale, Less than 12 Months, Fair Value		10,944
Available-for-Sale, Less than 12 Months, Unrealized Losses		(27)
Available-for-Sale, 12 months or longer, Fair Value		0
Available-for-Sale, 12 months or longer, Unrealized Losses		0
Available-for-Sale, Fair Value		10,944
Available-for-Sale, Unrealized Losses		(27)
U.S. Government-Sponsored Entities And Agencies [Member]
Available-for-Sale, Less than 12 Months, Fair Value		120,404
Available-for-Sale, Less than 12 Months, Unrealized Losses		(2,401)
Available-for-Sale, 12 months or longer, Fair Value		0
Available-for-Sale, 12 months or longer, Unrealized Losses		0
Available-for-Sale, Fair Value		120,404
Available-for-Sale, Unrealized Losses		(2,401)
Held-to-Maturity, Less than 12 Months, Fair Value		111,975
Held-to-Maturity, Less than 12 Months, Unrealized Losses		(3,703)
Held-to-Maturity, 12 months or longer, Fair Value		0
Held-to-Maturity, 12 months or longer, Unrealized Losses		0
Held-to-maturity, Fair Value		111,975
Held-to-Maturity, Unrealized Losses		(3,703)
Mortgage-Backed Securities, Issued By U.S. Government Sponsored Enterprises [Member]
Available-for-Sale, Less than 12 Months, Fair Value	130,244	160,784
Available-for-Sale, Less than 12 Months, Unrealized Losses	(364)	(485)
Available-for-Sale, 12 months or longer, Fair Value	3	483
Available-for-Sale, 12 months or longer, Unrealized Losses	0	0
Available-for-Sale, Fair Value	130,247	161,267
Available-for-Sale, Unrealized Losses	(364)	(485)
Held-to-Maturity, Less than 12 Months, Fair Value		67,837
Held-to-Maturity, Less than 12 Months, Unrealized Losses		(510)
Held-to-Maturity, 12 months or longer, Fair Value		0
Held-to-Maturity, 12 months or longer, Unrealized Losses		0
Held-to-maturity, Fair Value		67,837
Held-to-Maturity, Unrealized Losses		(510)
Mortgage-Backed Securities - Non-Agency Group 1 [Member]
Available-for-Sale, Less than 12 Months, Fair Value	9,685	13,265
Available-for-Sale, Less than 12 Months, Unrealized Losses	(439)	(1,696)
Available-for-Sale, 12 months or longer, Fair Value	62,079	79,327
Available-for-Sale, 12 months or longer, Unrealized Losses	(3,612)	(6,684)
Available-for-Sale, Fair Value	71,764	92,592
Available-for-Sale, Unrealized Losses	(4,051)	(8,380)
States And Political Subdivisions [Member]
Available-for-Sale, Less than 12 Months, Fair Value	2,780	94,448
Available-for-Sale, Less than 12 Months, Unrealized Losses	(154)	(2,549)
Available-for-Sale, 12 months or longer, Fair Value	0	0
Available-for-Sale, 12 months or longer, Unrealized Losses	0	0
Available-for-Sale, Fair Value	2,780	94,448
Available-for-Sale, Unrealized Losses	(154)	(2,549)
Held-to-Maturity, Less than 12 Months, Fair Value	0	203,093
Held-to-Maturity, Less than 12 Months, Unrealized Losses	0	(13,003)
Held-to-Maturity, 12 months or longer, Fair Value	13,324	0
Held-to-Maturity, 12 months or longer, Unrealized Losses	(107)	0
Held-to-maturity, Fair Value	13,324	203,093
Held-to-Maturity, Unrealized Losses	(107)	(13,003)
Pooled Trust Preferred Securities Group 1 [Member]
Available-for-Sale, Less than 12 Months, Fair Value	0	0
Available-for-Sale, Less than 12 Months, Unrealized Losses	0	0
Available-for-Sale, 12 months or longer, Fair Value	7,531	8,400
Available-for-Sale, 12 months or longer, Unrealized Losses	(19,816)	(18,968)
Available-for-Sale, Fair Value	7,531	8,400
Available-for-Sale, Unrealized Losses	(19,816)	(18,968)
Other Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value	8,222	12,283
Available-for-Sale, Less than 12 Months, Unrealized Losses	(127)	(206)
Available-for-Sale, 12 months or longer, Fair Value	6,173	6,204
Available-for-Sale, 12 months or longer, Unrealized Losses	(1,894)	(1,850)
Available-for-Sale, Fair Value	14,395	18,487
Available-for-Sale, Unrealized Losses	(2,021)	(2,056)
Held-to-Maturity, Less than 12 Months, Fair Value		0
Held-to-Maturity, Less than 12 Months, Unrealized Losses		0
Held-to-Maturity, 12 months or longer, Fair Value		375
Held-to-Maturity, 12 months or longer, Unrealized Losses		(176)
Held-to-maturity, Fair Value		375
Held-to-Maturity, Unrealized Losses		$ (176)

This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for those securities which are categorized neither as held-to-maturity nor trading securities.

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This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized neither as held-to-maturity nor trading securities.

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