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Fair Value (Fair Value By Level) (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Available for sale debt securities | $ 4,171,881,000 | $ 3,080,768,000
Equity Securities | 6,136,000 | 6,202,000
Marketable Securities | 4,181,417,000 | 3,090,370,000
Estimate of Fair Value Measurement | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 4,123,636,000 | 3,029,954,000
Estimate of Fair Value Measurement | States and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 48,245,000 | 50,814,000
Recurring | Estimate of Fair Value Measurement |  |
Assets: |  |
Marketable Securities | 4,178,017,000 | 3,086,970,000
Recurring | Estimate of Fair Value Measurement | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 4,123,636,000 | 3,029,954,000
Recurring | Estimate of Fair Value Measurement | States and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 48,245,000 | 50,814,000
Recurring | Estimate of Fair Value Measurement | Equity Securities |  |
Assets: |  |
Equity Securities | 6,136,000 | 6,202,000
Recurring | Estimate of Fair Value Measurement | Level 1 |  |
Assets: |  |
Marketable Securities | 6,136,000 | 6,202,000
Recurring | Estimate of Fair Value Measurement | Level 1 | Equity Securities |  |
Assets: |  |
Equity Securities | 6,136,000 | 6,202,000
Recurring | Estimate of Fair Value Measurement | Level 2 |  |
Assets: |  |
Marketable Securities | 4,171,881,000 | 3,080,768,000
Recurring | Estimate of Fair Value Measurement | Level 2 | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 4,123,636,000 | 3,029,954,000
Recurring | Estimate of Fair Value Measurement | Level 2 | States and political subdivisions |  |
Assets: |  |
Available for sale debt securities | $ 48,245,000 | $ 50,814,000

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