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Investments (Aggregate Values And Unrealized Gains And Losses) (Details) (USD $) In Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2010
Investment securities available for sale, cost | $ 3,982,402 |  | $ 3,724,779 |  | $ 4,486,881 |
Investment securities available for sale, gross unrealized gains | 33,481 |  | 44,127 |  | 34,618 |
Investment securities available for sale, gross unrealized losses | 1,642 |  | 129 |  | 11,423 |
Total investment securities available for sale, fair value | 4,014,241 | [1] | 3,768,777 | [1] | 4,510,076 | [2]
Investment securities held to maturity, cost | 2,098 | [1] | 3,084 | [1] | 2,532 | [2]
Investment securities held to maturity, gross unrealized gains |  |  | 276 |  |  |
Investment securities held to maturity, gross unrealized losses |  |  | 26 |  |  |
Investment securities held to maturity, fair value | 2,278 |  | 3,334 |  | 2,741 |
U. S. Treasury [Member] |  |  |  |  |  |
Investment securities available for sale, cost | 1,286,978 |  | 2,173,759 |  | 1,935,666 |
Investment securities available for sale, gross unrealized gains | 2,309 |  | 9,219 |  | 4,041 |
Investment securities available for sale, gross unrealized losses | 5 |  |  |  | 307 |
Total investment securities available for sale, fair value | 1,289,282 |  | 2,182,978 |  | 1,939,400 |
Government Agency [Member] |  |  |  |  |  |
Investment securities available for sale, cost | 1,904,135 |  | 899,375 |  | 1,930,469 |
Investment securities available for sale, gross unrealized gains | 1,846 |  | 2,387 |  | 361 |
Investment securities available for sale, gross unrealized losses | 1,140 |  | 23 |  | 10,844 |
Total investment securities available for sale, fair value | 1,904,843 |  | 901,739 |  | 1,919,986 |
Corporate Bonds [Member] |  |  |  |  |  |
Investment securities available for sale, cost | 461,756 |  | 480,738 |  | 479,160 |
Investment securities available for sale, gross unrealized gains | 5,258 |  | 8,845 |  | 7,498 |
Investment securities available for sale, gross unrealized losses | 43 |  |  |  |  |
Total investment securities available for sale, fair value | 466,971 |  | 489,583 |  | 486,658 |
Residential Mortgage-Backed Securities [Member] |  |  |  |  |  |
Investment securities available for sale, cost | 327,531 |  | 168,307 |  | 139,291 |
Investment securities available for sale, gross unrealized gains | 6,403 |  | 6,313 |  | 4,522 |
Investment securities available for sale, gross unrealized losses | 451 |  | 104 |  | 268 |
Total investment securities available for sale, fair value | 333,483 |  | 174,516 |  | 143,545 |
Investment securities held to maturity, cost | 2,098 |  | 2,933 |  | 2,532 |
Investment securities held to maturity, gross unrealized gains | 206 |  | 276 |  | 235 |
Investment securities held to maturity, gross unrealized losses | 26 |  | 26 |  | 26 |
Investment securities held to maturity, fair value | 2,278 |  | 3,183 |  | 2,741 |
Equity Securities [Member] |  |  |  |  |  |
Investment securities available for sale, cost | 965 |  | 1,358 |  | 1,055 |
Investment securities available for sale, gross unrealized gains | 17,644 |  | 17,333 |  | 18,176 |
Investment securities available for sale, gross unrealized losses |  |  |  |  |  |
Total investment securities available for sale, fair value | 18,609 |  | 18,691 |  | 19,231 |
State, County, Municipal [Member] |  |  |  |  |  |
Investment securities available for sale, cost | 1,037 |  | 1,242 |  | 1,240 |
Investment securities available for sale, gross unrealized gains | 19 |  | 30 |  | 20 |
Investment securities available for sale, gross unrealized losses | 3 |  | 2 |  | 4 |
Total investment securities available for sale, fair value | 1,053 |  | 1,270 |  | 1,256 |
Investment securities held to maturity, cost |  |  | 151 |  |  |
Investment securities held to maturity, gross unrealized gains |  |  |  |  |  |
Investment securities held to maturity, gross unrealized losses |  |  |  |  |  |
Investment securities held to maturity, fair value |  |  | $ 151 |  |  |
[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 item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 + Details
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- Definition This item represents the gross unrealized gains for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized gains are the excess of the fair value of the Available-for-sale Securities over their carrying value as of the reporting date. Such gross unrealized gains are included in other comprehensive income in the statement of shareholders' equity, unless the Available-for-sale Security is designated as a hedge. All or a portion of the unrealized holding gain 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 19 + Details
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- Definition This item represents the gross unrealized losses for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized losses are the excess of the carrying value of the Available-for-sale Securities over their fair value as of the reporting date. Such gross unrealized losses are included in other comprehensive income in the statement of shareholders' equity, 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 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 13, 19 + Details
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