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Fair Value Measurements (Fair Value By Level) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Available for sale debt securities | $ 3,298,840 | $ 3,378,923
Equity Securities | 6,182 | 6,095
Marketable Securities | 3,308,422 | 3,387,418
Assets/liabilities measured at fair value | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 3,234,735 | 3,285,548
Assets/liabilities measured at fair value | Obligations of states and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 64,105 | 93,375
Measured on a recurring basis: | Assets/liabilities measured at fair value |  |
Assets: |  |
Marketable Securities | 3,305,022 | 3,385,018
Measured on a recurring basis: | Assets/liabilities measured at fair value | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 3,234,735 | 3,285,548
Measured on a recurring basis: | Assets/liabilities measured at fair value | Obligations of states and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 64,105 | 93,375
Measured on a recurring basis: | Assets/liabilities measured at fair value | Equity securities with readily determinable fair values |  |
Assets: |  |
Equity Securities | 6,182 | 6,095
Measured on a recurring basis: | Assets/liabilities measured at fair value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Marketable Securities | 6,182 | 6,095
Measured on a recurring basis: | Assets/liabilities measured at fair value | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities with readily determinable fair values |  |
Assets: |  |
Equity Securities | 6,182 | 6,095
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Marketable Securities | 3,298,840 | 3,378,923
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 debt securities | 3,234,735 | 3,285,548
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 debt securities | $ 64,105 | $ 93,375

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