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Schedule II - Condensed Financial Information of Registrant Level 4 (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Cash and Cash Equivalents | $ 1,268,545 | $ 404,952 | $ 597,766 | $ 528,002
Deferred Tax Assets, Net | (49,303) | 21,981 |  |
Other Assets | 153,049 | 81,671 |  |
Total assets | 35,133,478 | 30,874,719 |  |
Liabilities [Abstract] |  |  |  |
Notes Payable | 309,869 | 297,608 |  |
Other Liabilities | 573,704 | 380,529 |  |
Total liabilities | 33,413,241 | 29,466,040 |  |
Stockholders' Equity Attributable to Parent [Abstract] |  |  |  |
Common Stock, Value, Outstanding | 61,751 | 57,837 |  |
Additional Paid in Capital | 496,715 | 468,281 |  |
Employee Stock Ownership Plan (ESOP), Deferred Shares | (2,583) | (3,620) |  |
Accumulated other comprehensive income | 686,807 | 457,229 |  |
Retained earnings | 477,547 | 428,952 |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1,720,237 | 1,408,679 | 938,047 | 754,623
Total liabilities and stockholders' equity | 35,133,478 | 30,874,719 |  |
Parent Company [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash and Cash Equivalents | 11,220 | 12,609 | 62,324 | 54,212
Equity Securities, Subsidiary Trusts | 7,398 | 8,196 |  |
Related Party Transaction, Due from (to) Related Party | 535 | 747 |  |
Deferred Tax Assets, Net | 2,378 | 0 |  |
Federal Income Tax Recoverable, From Subsidiaries | 11,613 | 8,868 |  |
Other Assets | 55,010 | 61,233 |  |
Assets, Excluding Investment in and Advances to Subsidiaries | 88,154 | 91,653 |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 2,235,403 | 1,933,845 |  |
Total assets | 2,323,557 | 2,025,498 |  |
Liabilities [Abstract] |  |  |  |
Notes Payable | 309,869 | 297,608 |  |
Subordinated Debentures, Payable to Subsidiaries | 245,869 | 268,653 |  |
Deferred Income Tax Liabilities | 0 | 460 |  |
Other Liabilities | 47,582 | 50,098 |  |
Total liabilities | 603,320 | 616,819 |  |
Stockholders' Equity Attributable to Parent [Abstract] |  |  |  |
Common Stock, Value, Outstanding | 61,751 | 57,837 |  |
Additional Paid in Capital | 496,715 | 468,281 |  |
Employee Stock Ownership Plan (ESOP), Deferred Shares | (2,583) | (3,620) |  |
Accumulated other comprehensive income | 686,807 | 457,229 |  |
Retained earnings | 477,547 | 428,952 |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 1,720,237 | 1,408,679 |  |
Total liabilities and stockholders' equity | $ 2,323,557 | $ 2,025,498 |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 26 -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 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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