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, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Investment [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	$ 97,801	$ 412,128
Available-for-Sale, Less than 12 Months, Unrealized Losses	(734)	(7,364)
Available-for-Sale, 12 months or longer, Fair Value	74,096	94,414
Available-for-Sale, 12 months or longer, Unrealized Losses	(24,858)	(27,502)
Available-for-Sale, Fair Value	171,897	506,542
Available-for-Sale, Unrealized Losses	(25,592)	(34,866)
Held-to-Maturity, Less than 12 Months, Fair Value	1,635	382,905
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(3)	(17,216)
Held-to-Maturity, 12 months or longer, Fair Value	13,180	375
Held-to-Maturity, 12 months or longer, Unrealized Losses	(175)	(176)
Held-to-maturity, Fair Value	14,815	383,280
Held-to-Maturity, Unrealized Losses	(178)	(17,392)
U.S. Treasury [Member]
Investment [Line Items]
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]
Investment [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	24,935	120,404
Available-for-Sale, Less than 12 Months, Unrealized Losses	(65)	(2,401)
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	24,935	120,404
Available-for-Sale, Unrealized Losses	(65)	(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 - Agency [Member]
Investment [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	49,016	160,784
Available-for-Sale, Less than 12 Months, Unrealized Losses	(61)	(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	49,019	161,267
Available-for-Sale, Unrealized Losses	(61)	(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]
Investment [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	10,053	13,265
Available-for-Sale, Less than 12 Months, Unrealized Losses	(353)	(1,696)
Available-for-Sale, 12 months or longer, Fair Value	59,203	79,327
Available-for-Sale, 12 months or longer, Unrealized Losses	(4,520)	(6,684)
Available-for-Sale, Fair Value	69,256	92,592
Available-for-Sale, Unrealized Losses	(4,873)	(8,380)
States And Political Subdivisions [Member]
Investment [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	9,281	94,448
Available-for-Sale, Less than 12 Months, Unrealized Losses	(114)	(2,549)
Available-for-Sale, 12 months or longer, Fair Value	1,345	0
Available-for-Sale, 12 months or longer, Unrealized Losses	(79)	0
Available-for-Sale, Fair Value	10,626	94,448
Available-for-Sale, Unrealized Losses	(193)	(2,549)
Held-to-Maturity, Less than 12 Months, Fair Value	1,613	203,093
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(1)	(13,003)
Held-to-Maturity, 12 months or longer, Fair Value	13,180	0
Held-to-Maturity, 12 months or longer, Unrealized Losses	(175)	0
Held-to-maturity, Fair Value	14,793	203,093
Held-to-Maturity, Unrealized Losses	(176)	(13,003)
Pooled Trust Preferred Securities [Member]
Investment [Line Items]
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	7,327	8,400
Available-for-Sale, 12 months or longer, Unrealized Losses	(18,134)	(18,968)
Available-for-Sale, Fair Value	7,327	8,400
Available-for-Sale, Unrealized Losses	(18,134)	(18,968)
Other Securities [Member]
Investment [Line Items]
Available-for-Sale, Less than 12 Months, Fair Value	4,516	12,283
Available-for-Sale, Less than 12 Months, Unrealized Losses	(141)	(206)
Available-for-Sale, 12 months or longer, Fair Value	6,218	6,204
Available-for-Sale, 12 months or longer, Unrealized Losses	(2,125)	(1,850)
Available-for-Sale, Fair Value	10,734	18,487
Available-for-Sale, Unrealized Losses	(2,266)	(2,056)
Held-to-Maturity, Less than 12 Months, Fair Value	22	0
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(2)	0
Held-to-Maturity, 12 months or longer, Fair Value	0	375
Held-to-Maturity, 12 months or longer, Unrealized Losses	0	(176)
Held-to-maturity, Fair Value	22	375
Held-to-Maturity, Unrealized Losses	$ (2)	$ (176)