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Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Assets: |  |
Estimated fair value, Available for sale securities | $ 4,673,472 | $ 4,911,963
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value |  |
Assets: |  |
Estimated fair value, Available for sale securities | 4,673,472 | 4,911,963
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value | Residential mortgage-backed securities |  |
Assets: |  |
Estimated fair value, Available for sale securities | 4,365,066 | 4,600,372
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value | States and political subdivisions |  |
Assets: |  |
Estimated fair value, Available for sale securities | 279,296 | 282,276
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value | Other |  |
Assets: |  |
Estimated fair value, Available for sale securities | 29,110 | 29,315
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Estimated fair value, Available for sale securities | 29,110 | 29,315
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other |  |
Assets: |  |
Estimated fair value, Available for sale securities | 29,110 | 29,315
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Estimated fair value, Available for sale securities | 4,621,666 | 4,858,585
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities |  |
Assets: |  |
Estimated fair value, Available for sale securities | 4,342,370 | 4,576,309
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | States and political subdivisions |  |
Assets: |  |
Estimated fair value, Available for sale securities | 279,296 | 282,276
Measured on a recurring basis: | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Estimated fair value, Available for sale securities | 22,696 | 24,063
Measured on a recurring basis: | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities |  |
Assets: |  |
Estimated fair value, Available for sale securities | $ 22,696 | $ 24,063

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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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