Investment Securities (Amortized Cost And Fair Values Of Investment Securities) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	$ 2,650,089	$ 2,429,584
Available-for-Sale, Gross Unrealized Gains	66,920	32,482
Available-for-Sale, Gross Unrealized Losses	25,722	53,123
Available-for-sale Securities, Total	2,691,287	2,408,943	2,363,331
Held-to-Maturity, Amortized Cost	8,477	8,668
Held-to-Maturity, Gross Unrealized Gains	0	0
Held-to-Maturity, Gross Unrealized Losses	0	0
Held-to-Maturity, Fair Value	8,477	8,668	8,735
U.S. Government Agencies [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	233,206	268,828
Available-for-Sale, Gross Unrealized Gains	2,553	2,230
Available-for-Sale, Gross Unrealized Losses	2	2,883
Available-for-sale Securities, Total	235,757	268,175
Obligations Of States And Political Subdivisions [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	390,196	397,777
Available-for-Sale, Gross Unrealized Gains	22,820	4,869
Available-for-Sale, Gross Unrealized Losses	82	5,986
Available-for-sale Securities, Total	412,934	396,660
Agency Residential Mortgage-Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	1,653,420	1,321,771
Available-for-Sale, Gross Unrealized Gains	38,376	19,671
Available-for-Sale, Gross Unrealized Losses	209	17,873
Available-for-sale Securities, Total	1,691,587	1,323,569
Non-Agency Residential Mortgage-Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	83,655	129,206
Available-for-Sale, Gross Unrealized Gains	0	32
Available-for-Sale, Gross Unrealized Losses	8,888	12,427
Available-for-sale Securities, Total	74,767	116,811
Commercial Mortgage-Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	63,144	99,501
Available-for-Sale, Gross Unrealized Gains	2,146	5,341
Available-for-Sale, Gross Unrealized Losses	0	0
Available-for-sale Securities, Total	65,290	104,842
Other Structured Financial Products [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	24,792	24,680
Available-for-Sale, Gross Unrealized Gains	0	0
Available-for-Sale, Gross Unrealized Losses	12,052	12,177
Available-for-sale Securities, Total	12,740	12,503
Other Debt Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	54,152	41,842
Available-for-Sale, Gross Unrealized Gains	170	88
Available-for-Sale, Gross Unrealized Losses	3,650	930
Available-for-sale Securities, Total	50,672	41,000
Equity Securities Of FHLB [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	73,007	71,065
Available-for-Sale, Gross Unrealized Gains	0	0
Available-for-Sale, Gross Unrealized Losses	0	0
Available-for-sale Securities, Total	73,007	71,065
Equity Securities Of FRB [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	50,225	50,225
Available-for-Sale, Gross Unrealized Gains	0	0
Available-for-Sale, Gross Unrealized Losses	0	0
Available-for-sale Securities, Total	50,225	50,225
Other Equity Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available-for-Sale, Amortized Cost	24,292	24,689
Available-for-Sale, Gross Unrealized Gains	855	251
Available-for-Sale, Gross Unrealized Losses	839	847
Available-for-sale Securities, Total	24,308	24,093
Other [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Held-to-Maturity, Amortized Cost	4,570	4,560
Held-to-Maturity, Gross Unrealized Gains	0	0
Held-to-Maturity, Gross Unrealized Losses	0	0
Held-to-Maturity, Fair Value	4,570	4,560
State And Municipal [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Held-to-Maturity, Amortized Cost	3,907	4,108
Held-to-Maturity, Gross Unrealized Gains	0	0
Held-to-Maturity, Gross Unrealized Losses	0	0
Held-to-Maturity, Fair Value	$ 3,907	$ 4,108

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Number 115

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+ Details