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Estimated Fair Values (Assets And Liabilities Carried At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands | Jun. 30, 2011 | Dec. 31, 2010 | Jun. 30, 2010
--- | --- | --- | ---
Total investment securities available for sale, fair value | $ 4,014,241 | [1] | $ 4,510,076 | [2] | $ 3,768,777 | [1]
U.S. Government [Member] | Fair Value [Member] |  |  |  |  |  |
Investment securities available for sale | 1,289,282 |  | 1,939,400 |  | 2,182,978 |
U.S. Government [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Investment securities available for sale | 1,289,282 |  | 1,939,400 |  | 2,182,978 |
U.S. Government [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Corporate Bonds [Member] | Fair Value [Member] |  |  |  |  |  |
Investment securities available for sale | 466,971 |  | 486,658 |  | 489,583 |
Corporate Bonds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Investment securities available for sale | 466,971 |  | 486,658 |  | 489,583 |
Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Government Agency [Member] | Fair Value [Member] |  |  |  |  |  |
Investment securities available for sale | 1,904,843 |  | 1,919,986 |  | 901,739 |
Government Agency [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Investment securities available for sale | 1,904,843 |  | 1,919,986 |  | 901,739 |
Government Agency [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Residential Mortgage-Backed Securities [Member] | Fair Value [Member] |  |  |  |  |  |
Investment securities available for sale | 333,483 |  | 143,545 |  | 174,516 |
Residential Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Investment securities available for sale | 333,483 |  | 143,545 |  | 174,516 |
Residential Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Equity Securities [Member] | Fair Value [Member] |  |  |  |  |  |
Investment securities available for sale | 18,609 |  | 19,231 |  | 18,691 |
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Investment securities available for sale | 18,609 |  | 19,231 |  | 18,691 |
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
State, County, Municipal [Member] | Fair Value [Member] |  |  |  |  |  |
Investment securities available for sale | 1,053 |  | 1,256 |  | 1,270 |
State, County, Municipal [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Investment securities available for sale | 1,053 |  | 1,256 |  | 1,270 |
State, County, Municipal [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Fair Value [Member] |  |  |  |  |  |
Total investment securities available for sale, fair value | 4,014,241 |  | 4,510,076 |  | 3,768,777 |
Interest rate swaps accounted for as cash flow hedges | 9,800 |  | 9,492 |  | 11,309 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Total investment securities available for sale, fair value | 3,679,705 |  | 4,365,275 |  | 3,592,991 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Total investment securities available for sale, fair value | 334,536 |  | 144,801 |  | 175,786 |
Interest rate swaps accounted for as cash flow hedges | 9,800 |  | 9,492 |  | 11,309 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Total investment securities available for sale, fair value |  |  |  |  |  |
Interest rate swaps accounted for as cash flow hedges |  |  |  |  |  |
[1] | Unaudited
[2] | Derived from the 2010 Annual Report on Form 10-K.

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- Definition For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading. Such securities are reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 + Details
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- Definition This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a + Details
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- Definition This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a + Details
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