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	6 Months Ended	12 Months Ended
Jun. 30, 2011	Dec. 31, 2010
Available-for-Sale, Less than 12 Months, Fair Value	$ 113,295	$ 412,128
Available-for-Sale, Less than 12 Months, Unrealized Losses	(896)	(7,364)
Available-for-Sale, 12 months or longer, Fair Value	81,290	94,414
Available-for-Sale, 12 months or longer, Unrealized Losses	(21,231)	(27,502)
Available-for-Sale, Fair Value	194,585	506,542
Available-for-Sale, Unrealized Losses	(22,127)	(34,866)
Held-to-Maturity, Less than 12 Months, Fair Value	244,267	382,905
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(3,284)	(17,216)
Held-to-Maturity, 12 months or longer, Fair Value	145	375
Held-to-Maturity, 12 months or longer, Unrealized Losses	(15)	(176)
Held-to-maturity, Fair Value	244,412	383,280
Held-to-Maturity, Unrealized Losses	(3,299)	(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)
US Government-Sponsored Entities And Agencies [Member]
Available-for-Sale, Less than 12 Months, Fair Value	5,559	120,404
Available-for-Sale, Less than 12 Months, Unrealized Losses	(108)	(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	5,559	120,404
Available-for-Sale, Unrealized Losses	(108)	(2,401)
Held-to-Maturity, Less than 12 Months, Fair Value	114,336	111,975
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(85)	(3,703)
Held-to-Maturity, 12 months or longer, Fair Value	0	0
Held-to-Maturity, 12 months or longer, Unrealized Losses	0	0
Held-to-maturity, Fair Value	114,336	111,975
Held-to-Maturity, Unrealized Losses	(85)	(3,703)
Mortgage-Backed Securities, Issued By US Government Sponsored Enterprises [Member]
Available-for-Sale, Less than 12 Months, Fair Value	76,559	160,784
Available-for-Sale, Less than 12 Months, Unrealized Losses	(113)	(485)
Available-for-Sale, 12 months or longer, Fair Value	66	483
Available-for-Sale, 12 months or longer, Unrealized Losses	0	0
Available-for-Sale, Fair Value	76,625	161,267
Available-for-Sale, Unrealized Losses	(113)	(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	5,545	13,265
Available-for-Sale, Less than 12 Months, Unrealized Losses	(33)	(1,696)
Available-for-Sale, 12 months or longer, Fair Value	64,347	79,327
Available-for-Sale, 12 months or longer, Unrealized Losses	(2,705)	(6,684)
Available-for-Sale, Fair Value	69,892	92,592
Available-for-Sale, Unrealized Losses	(2,738)	(8,380)
States And Political Subdivisions [Member]
Available-for-Sale, Less than 12 Months, Fair Value	25,092	94,448
Available-for-Sale, Less than 12 Months, Unrealized Losses	(640)	(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	25,092	94,448
Available-for-Sale, Unrealized Losses	(640)	(2,549)
Held-to-Maturity, Less than 12 Months, Fair Value	129,931	203,093
Held-to-Maturity, Less than 12 Months, Unrealized Losses	(3,199)	(13,003)
Held-to-Maturity, 12 months or longer, Fair Value	0	0
Held-to-Maturity, 12 months or longer, Unrealized Losses	0	0
Held-to-maturity, Fair Value	129,931	203,093
Held-to-Maturity, Unrealized Losses	(3,199)	(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	9,738	8,400
Available-for-Sale, 12 months or longer, Unrealized Losses	(17,611)	(18,968)
Available-for-Sale, Fair Value	9,738	8,400
Available-for-Sale, Unrealized Losses	(17,611)	(18,968)
Other Securities [Member]
Available-for-Sale, Less than 12 Months, Fair Value	540	12,283
Available-for-Sale, Less than 12 Months, Unrealized Losses	(2)	(206)
Available-for-Sale, 12 months or longer, Fair Value	7,139	6,204
Available-for-Sale, 12 months or longer, Unrealized Losses	(915)	(1,850)
Available-for-Sale, Fair Value	7,679	18,487
Available-for-Sale, Unrealized Losses	(917)	(2,056)
Held-to-Maturity, Less than 12 Months, Fair Value	0	0
Held-to-Maturity, Less than 12 Months, Unrealized Losses	0	0
Held-to-Maturity, 12 months or longer, Fair Value	145	375
Held-to-Maturity, 12 months or longer, Unrealized Losses	(15)	(176)
Held-to-maturity, Fair Value	145	375
Held-to-Maturity, Unrealized Losses	$ (15)	$ (176)

This item represents the excess of [amortized] cost 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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-1
-Paragraph 21
-Subparagraph a(2)

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 17
-Subparagraph a(1)

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