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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Assets: |  |
Available for sale securities | $ 5,448,750 | $ 5,525,015
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value |  |
Assets: |  |
Available for sale securities | 5,448,750 | 5,525,015
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale securities | 5,172,186 | 5,265,204
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value | States and political subdivisions |  |
Assets: |  |
Available for sale securities | 247,731 | 238,675
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value | Other |  |
Assets: |  |
Available for sale securities | 28,833 | 21,136
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Available for sale securities | 28,833 | 21,136
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other |  |
Assets: |  |
Available for sale securities | 28,833 | 21,136
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Available for sale securities | 5,390,918 | 5,471,019
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale securities | 5,143,187 | 5,232,344
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | States and political subdivisions |  |
Assets: |  |
Available for sale securities | 247,731 | 238,675
Measured on a recurring basis: | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Available for sale securities | 28,999 | 32,860
Measured on a recurring basis: | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale securities | $ 28,999 | $ 32,860

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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