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Fair Value (Fair Value By Level) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets:
Available for sale debt securities	$ 3,467,913	$ 3,411,350
Equity Securities	6,127	5,937
Marketable Securities	3,476,440	3,418,487
Assets/liabilities measured at fair value
Assets:
Available for sale debt securities	3,467,913
Assets/liabilities measured at fair value | Residential mortgage-backed securities
Assets:
Available for sale debt securities	3,340,220	3,223,010
Assets/liabilities measured at fair value | Obligations of states and political subdivisions
Assets:
Available for sale debt securities	127,693	188,340
Measured on a recurring basis: | Assets/liabilities measured at fair value
Assets:
Marketable Securities	3,474,040	3,417,287
Measured on a recurring basis: | Assets/liabilities measured at fair value | Residential mortgage-backed securities
Assets:
Available for sale debt securities	3,340,220	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	127,693	188,340
Measured on a recurring basis: | Assets/liabilities measured at fair value | Equity securities with readily determinable fair values
Assets:
Equity Securities	6,127	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	6,127	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	6,127	5,937
Measured on a recurring basis: | Assets/liabilities measured at fair value | Significant Other Observable Inputs (Level 2)
Assets:
Marketable Securities	3,467,913	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	3,340,220	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	$ 127,693	$ 188,340

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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