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Investments (Maturity Information) (Details) (USD $) In Thousands | Jun. 30, 2011 | Dec. 31, 2010 | Jun. 30, 2010
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Investment securities available for sale maturing in one year or less, cost | $ 3,133,236 |  | $ 3,441,185 |  | $ 2,342,011 |
Investment securities available for sale maturing in one through five years, cost | 549,912 |  | 916,101 |  | 1,220,914 |
Investment securities available for sale maturing in five through ten years, cost | 99,834 |  | 1,683 |  | 1,912 |
Investment securities available for sale maturing in over ten years, cost | 198,456 |  | 126,857 |  | 158,584 |
Total investment securities available for sale, cost | 3,982,402 |  | 4,486,881 |  | 3,724,779 |
Investment securities available for sale maturing in one year or less, fair value | 3,140,002 |  | 3,436,818 |  | 2,351,171 |
Investment securities available for sale maturing in one through five years, fair value | 551,647 |  | 921,536 |  | 1,232,535 |
Investment securities available for sale maturing in five through ten years, fair value | 100,387 |  | 1,710 |  | 1,946 |
Investment securities available for sale maturing in over ten years, fair value | 203,596 |  | 130,781 |  | 164,434 |
Total investment securities available for sale, fair value | 4,014,241 | [1] | 4,510,076 | [2] | 3,768,777 | [1]
Investment securities held to maturity maturing in one through five years, cost | 8 |  |  |  | 151 |
Investment securities held to maturity maturing in five through ten years, cost | 1,973 |  | 2,404 |  | 2,797 |
Investment securities held to maturity maturing in over ten years, cost | 117 |  | 128 |  | 136 |
Investment securities held to maturity | 2,098 | [1] | 2,532 | [2] | 3,084 | [1]
Investment securities held to maturity maturing in one through five years, fair value | 6 |  |  |  | 151 |
Investment securities held to maturity maturing in five through ten years, fair value | 2,110 |  | 2,570 |  | 3,005 |
Investment securities held to maturity maturing in over ten years, fair value | 162 |  | 171 |  | 178 |
Total investment securities held to maturity, fair value | 2,278 |  | 2,741 |  | 3,334 |
Equity Securities [Member] |  |  |  |  |  |
Total investment securities available for sale, cost | 965 |  | 1,055 |  | 1,358 |
Total investment securities available for sale, fair value | $ 18,609 |  | $ 19,231 |  | $ 18,691 |
[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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