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Fair Value (Fair Value By Level) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets: |  |
Available-for-sale securities | $ 4,152,070 | $ 4,177,349
Assets/liabilities measured at fair value |  |
Assets: |  |
Available-for-sale securities | 4,152,070 | 4,177,349
Assets/liabilities measured at fair value | Residential mortgage-backed securities |  |
Assets: |  |
Available-for-sale securities | 3,891,233 | 3,894,470
Assets/liabilities measured at fair value | Obligations of states and political subdivisions |  |
Assets: |  |
Available-for-sale securities | 232,951 | 254,972
Assets/liabilities measured at fair value | Equity securities |  |
Assets: |  |
Available-for-sale securities | 27,886 | 27,907
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Available-for-sale securities | 27,886 | 27,907
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities |  |
Assets: |  |
Available-for-sale securities | 27,886 | 27,907
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Available-for-sale securities | 4,124,184 | 4,131,837
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities |  |
Assets: |  |
Available-for-sale securities | 3,891,233 | 3,876,865
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
Assets: |  |
Available-for-sale securities | 232,951 | 254,972
Measured on a recurring basis: | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Available-for-sale securities |  | 17,605
Measured on a recurring basis: | Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities |  |
Assets: |  |
Available-for-sale securities |  | 17,605
Measured on a recurring basis: | Assets/liabilities measured at fair value |  |
Assets: |  |
Available-for-sale securities | 4,152,070 | 4,177,349
Measured on a recurring basis: | Assets/liabilities measured at fair value | Residential mortgage-backed securities |  |
Assets: |  |
Available-for-sale securities | 3,891,233 | 3,894,470
Measured on a recurring basis: | Assets/liabilities measured at fair value | Obligations of states and political subdivisions |  |
Assets: |  |
Available-for-sale securities | 232,951 | 254,972
Measured on a recurring basis: | Assets/liabilities measured at fair value | Equity securities |  |
Assets: |  |
Available-for-sale securities | $ 27,886 | $ 27,907

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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=75030427&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=82897076&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=82896770&loc=d3e26610-111562 + Details
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