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Fair Value (Fair Value By Level) (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Available for sale debt securities | $ 3,411,350,000 | $ 4,124,184,000
Equity Securities | 5,937,000 | 27,886,000
Marketable Securities | 3,418,487,000 | 4,154,470,000
Assets/liabilities measured at fair value | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 3,223,010,000 | 3,891,233,000
Assets/liabilities measured at fair value | Obligations of states and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 188,340,000 | 232,951,000
Assets/liabilities measured at fair value | Equity securities with readily determinable fair values |  |
Assets: |  |
Equity Securities |  | 27,886,000
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Marketable Securities | 5,937,000 | 27,886,000
Measured on a recurring basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities with readily determinable fair values |  |
Assets: |  |
Equity Securities | 5,937,000 | 27,886,000
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Marketable Securities | 3,411,350,000 | 4,124,184,000
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 3,223,010,000 | 3,891,233,000
Measured on a recurring basis: | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 188,340,000 | 232,951,000
Measured on a recurring basis: | Assets/liabilities measured at fair value |  |
Assets: |  |
Marketable Securities | 3,417,287,000 | 4,152,070,000
Measured on a recurring basis: | Assets/liabilities measured at fair value | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 3,223,010,000 | 3,891,233,000
Measured on a recurring basis: | Assets/liabilities measured at fair value | Obligations of states and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 188,340,000 | 232,951,000
Measured on a recurring basis: | Assets/liabilities measured at fair value | Equity securities with readily determinable fair values |  |
Assets: |  |
Equity Securities | $ 5,937,000 | $ 27,886,000

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