Fair Value (Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Trading securities	$ 2,794	$ 0	$ 0
Investment securities available-for-sale	2,253,089	1,960,222	2,190,804
U.S. Treasury [Member]
Investment securities available-for-sale	65,951	62,550
U.S. Treasury [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Investment securities available-for-sale	65,951	62,550
U.S. Treasury [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Investment securities available-for-sale	0	0
U.S. Treasury [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Investment securities available-for-sale	0	0
U.S. Government-Sponsored Entities And Agencies [Member]
Investment securities available-for-sale	180,934	315,133
U.S. Government-Sponsored Entities And Agencies [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Investment securities available-for-sale	0	0
U.S. Government-Sponsored Entities And Agencies [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Investment securities available-for-sale	180,934	315,133
U.S. Government-Sponsored Entities And Agencies [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Investment securities available-for-sale	0	0
Mortgage-Backed Securities - Agency [Member]
Investment securities available-for-sale	1,346,534	944,446
Mortgage-Backed Securities - Agency [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Investment securities available-for-sale	0	0
Mortgage-Backed Securities - Agency [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Investment securities available-for-sale	1,346,534	944,446
Mortgage-Backed Securities - Agency [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Investment securities available-for-sale	0	0
Mortgage-Backed Securities - Non-Agency Group 1 [Member]
Investment securities available-for-sale	95,051	126,806
Mortgage-Backed Securities - Non-Agency Group 1 [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Investment securities available-for-sale	0	0
Mortgage-Backed Securities - Non-Agency Group 1 [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Investment securities available-for-sale	95,051	126,806
Mortgage-Backed Securities - Non-Agency Group 1 [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Investment securities available-for-sale	0	0
States And Political Subdivisions [Member]
Investment securities available-for-sale	391,202	348,924
States And Political Subdivisions [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Investment securities available-for-sale	0	0
States And Political Subdivisions [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Investment securities available-for-sale	391,202	348,924
States And Political Subdivisions [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Investment securities available-for-sale	0	0
Pooled Trust Preferred Securities Group 1 [Member]
Investment securities available-for-sale	7,530	8,400
Pooled Trust Preferred Securities Group 1 [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Investment securities available-for-sale	0	0
Pooled Trust Preferred Securities Group 1 [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Investment securities available-for-sale	0	0
Pooled Trust Preferred Securities Group 1 [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Investment securities available-for-sale	7,530	8,400
Other Securities [Member]
Investment securities available-for-sale	165,887	153,963
Other Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Investment securities available-for-sale	0	0
Other Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Investment securities available-for-sale	165,887	153,963
Other Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Investment securities available-for-sale	0	0
Residential Loans Held For Sale [Member]
Investment securities available-for-sale	4,710	3,819
Residential Loans Held For Sale [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Investment securities available-for-sale	0	0
Residential Loans Held For Sale [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Investment securities available-for-sale	4,710	3,819
Residential Loans Held For Sale [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Investment securities available-for-sale	0	0
Derivative Assets [Member]
Derivative assets	47,209	34,082
Derivative Assets [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Derivative assets	0	0
Derivative Assets [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Derivative assets	47,209	34,082
Derivative Assets [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Derivative assets	0	0
Derivative Liabilities [Member]
Derivative liabilities	39,599	29,721
Derivative Liabilities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Derivative liabilities	0	0
Derivative Liabilities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Derivative liabilities	39,599	29,721
Derivative Liabilities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Derivative liabilities	0	0
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Trading securities	2,794
Significant Other Observable Inputs (Level 2) [Member]
Trading securities	0
Significant Unobservable Inputs (Level 3) [Member]
Trading securities	$ 0

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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Reference 9: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details

- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details

- Definition

The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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+ Details