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Fair Value Measurements (Estimated Cost and Fair Value) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets: |  |
Estimated fair value, Available for sale securities | $ 4,337,940 | $ 4,199,372
Assets/Liabilities Measured at Fair Value |  |
Assets: |  |
Estimated fair value, Available for sale securities | 4,337,940 | 4,199,372
Assets/Liabilities Measured at Fair Value | Residential mortgage-backed securities |  |
Assets: |  |
Estimated fair value, Available for sale securities | 4,030,513 | 3,893,211
Assets/Liabilities Measured at Fair Value | States and political subdivisions |  |
Assets: |  |
Estimated fair value, Available for sale securities | 278,556 | 277,704
Assets/Liabilities Measured at Fair Value | Other |  |
Assets: |  |
Estimated fair value, Available for sale securities | 28,871 | 28,457
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value |  |
Assets: |  |
Estimated fair value, Available for sale securities | 4,337,940 | 4,199,372
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value | Residential mortgage-backed securities |  |
Assets: |  |
Estimated fair value, Available for sale securities | 4,030,513 | 3,893,210
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value | States and political subdivisions |  |
Assets: |  |
Estimated fair value, Available for sale securities | 278,556 | 277,705
Measured on a recurring basis: | Assets/Liabilities Measured at Fair Value | Other |  |
Assets: |  |
Estimated fair value, Available for sale securities | 28,871 | 28,457
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Estimated fair value, Available for sale securities |  | 28,457
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other |  |
Assets: |  |
Estimated fair value, Available for sale securities |  | 28,457
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Assets/Liabilities Measured at Fair Value |  |
Assets: |  |
Estimated fair value, Available for sale securities | 28,871 |
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Assets/Liabilities Measured at Fair Value | Other |  |
Assets: |  |
Estimated fair value, Available for sale securities | 28,871 |
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | Assets/Liabilities Measured at Fair Value |  |
Assets: |  |
Estimated fair value, Available for sale securities | 4,288,854 | 4,149,686
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | Assets/Liabilities Measured at Fair Value | Residential mortgage-backed securities |  |
Assets: |  |
Estimated fair value, Available for sale securities | 4,010,298 | 3,871,981
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | Assets/Liabilities Measured at Fair Value | States and political subdivisions |  |
Assets: |  |
Estimated fair value, Available for sale securities | 278,556 | 277,705
Measured on a recurring basis: | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Estimated fair value, Available for sale securities |  | 21,229
Measured on a recurring basis: | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities |  |
Assets: |  |
Estimated fair value, Available for sale securities |  | $ 21,229
Measured on a recurring basis: | Significant Unobservable Inputs (Level 3) | Assets/Liabilities Measured at Fair Value |  |
Assets: |  |
Estimated fair value, Available for sale securities | 20,215 |
Measured on a recurring basis: | Significant Unobservable Inputs (Level 3) | Assets/Liabilities Measured at Fair Value | Residential mortgage-backed securities |  |
Assets: |  |
Estimated fair value, Available for sale securities | $ 20,215 |

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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=51813488&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=49167202&loc=d3e26610-111562 + Details
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