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Investments (Maturity Information) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2011
--- | --- | --- | ---
Investment securities available for sale |  |  |  |  |  |
Total investment securities available for sale, cost | $ 4,606,093 |  | $ 4,029,858 |  | $ 3,982,402 |
Total investment securities available for sale, fair value | 4,634,248 |  | 4,056,423 |  | 4,014,241 |
Investment securities held to maturity |  |  |  |  |  |
Maturing in one through five years, cost | 1,470 |  | 12 |  | 8 |
Maturing in five through ten years, cost | 4 |  | 1,699 |  | 1,973 |
Maturing in over ten years, cost | 104 |  | 111 |  | 117 |
Investment securities held to maturity | 1,578 | [1] | 1,822 | [2] | 2,098 | [1]
Maturing in one through five years, fair value | 1,568 |  | 11 |  | 6 |
Maturing in five through ten years, fair value | 4 |  | 1,820 |  | 2,110 |
Maturing in over ten years, fair value | 142 |  | 149 |  | 162 |
Total investment securities held to maturity, fair value | 1,714 |  | 1,980 |  | 2,278 |
Debt Securities |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Maturing in one year or less, cost | 2,424,304 |  | 3,238,657 |  | 3,133,235 |
Maturing in one through five years, cost | 1,953,001 |  | 548,459 |  | 549,912 |
Maturing in five through ten years, cost | 71,914 |  | 90,605 |  | 99,834 |
Maturing in over ten years, cost | 156,033 |  | 151,198 |  | 198,456 |
Maturing in one year or less, fair value | 2,425,612 |  | 3,241,415 |  | 3,140,002 |
Maturing in one through five years, fair value | 1,954,357 |  | 549,351 |  | 551,647 |
Maturing in five through ten years, fair value | 72,533 |  | 91,087 |  | 100,387 |
Maturing in over ten years, fair value | 163,508 |  | 159,257 |  | 203,596 |
Equity Securities |  |  |  |  |  |
Investment securities available for sale |  |  |  |  |  |
Total investment securities available for sale, cost | 841 |  | 939 |  | 965 |
Total investment securities available for sale, fair value | $ 18,238 |  | $ 15,313 |  | $ 18,609 |
[1] | Unaudited
[2] | Derived from 2011 Annual Report on Form 10-K.

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- Definition This item represents the fair value of debt securities which are expected to mature after ten years from the balance sheet date which are categorized as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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- Definition This item represents debt securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature after ten years from the balance sheet date and which are categorized as held-to-maturity. + 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 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities more than one year from the balance sheet date or operating cycle, if longer; such investments are normally measured at amortized cost (carrying value) unless circumstances indicate that the value to be recovered from the investment is less than its carried amount. The held-to-maturity category is for those securities that the Company has the positive intent and ability to hold until maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 7-11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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