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Fair Value (Fair Value By Level) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Available for sale debt securities | $ 3,410,088 | $ 3,411,350
Equity Securities | 6,075 | 5,937
Marketable Securities | 3,418,563 | 3,418,487
Assets/liabilities measured at fair value |  |
Assets: |  |
Available for sale debt securities | 3,410,088 |
Assets/liabilities measured at fair value | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 3,263,030 | 3,223,010
Assets/liabilities measured at fair value | Obligations of states and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 147,058 | 188,340
Measured on a recurring basis: | Assets/liabilities measured at fair value |  |
Assets: |  |
Marketable Securities | 3,416,163 | 3,417,287
Measured on a recurring basis: | Assets/liabilities measured at fair value | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 3,263,030 | 3,223,010
Measured on a recurring basis: | Assets/liabilities measured at fair value | Obligations of states and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 147,058 | 188,340
Measured on a recurring basis: | Assets/liabilities measured at fair value | Equity securities with readily determinable fair values |  |
Assets: |  |
Equity Securities | 6,075 | 5,937
Measured on a recurring basis: | Assets/liabilities measured at fair value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Marketable Securities | 6,075 | 5,937
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 | 6,075 | 5,937
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Marketable Securities | 3,410,088 | 3,411,350
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 | 3,263,030 | 3,223,010
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 | $ 147,058 | $ 188,340

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