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Fair Value (Fair Value By Level) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets: |  |
Available for sale securities | $ 4,427,570 | $ 4,199,372
Assets/liabilities measured at fair value |  |
Assets: |  |
Available for sale securities | 4,427,570 | 4,199,372
Assets/liabilities measured at fair value | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale securities | 4,136,473 | 3,893,211
Assets/liabilities measured at fair value | Obligations of states and political subdivisions |  |
Assets: |  |
Available for sale securities | 262,251 | 277,704
Assets/liabilities measured at fair value | Equity securities |  |
Assets: |  |
Available for sale securities | 28,846 | 28,457
Measured on a recurring basis: | Assets/liabilities measured at fair value |  |
Assets: |  |
Available for sale securities | 4,427,570 | 4,199,372
Measured on a recurring basis: | Assets/liabilities measured at fair value | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale securities | 4,136,473 | 3,893,211
Measured on a recurring basis: | Assets/liabilities measured at fair value | Obligations of states and political subdivisions |  |
Assets: |  |
Available for sale securities | 262,251 | 277,704
Measured on a recurring basis: | Assets/liabilities measured at fair value | Equity securities |  |
Assets: |  |
Available for sale securities | 28,846 | 28,457
Measured on a recurring basis: | Assets/liabilities measured at fair value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Available for sale securities | 28,846 | 28,457
Measured on a recurring basis: | Assets/liabilities measured at fair value | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities |  |
Assets: |  |
Available for sale securities | 28,846 | 28,457
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Available for sale securities | 4,380,214 | 4,149,686
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale securities | 4,117,963 | 3,871,981
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
Assets: |  |
Available for sale securities | 262,251 | 277,705
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Available for sale securities | 18,510 | 21,229
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale securities | $ 18,510 | $ 21,229

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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=65884222&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=73527792&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=66010992&loc=d3e26610-111562 + Details
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