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Fair Value Measurements (Fair Value By Level) (Details) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets: |  |
Available for sale debt securities | $ 4,294,360,000 | $ 4,213,920,000
Equity Securities | 5,581,000 | 6,079,000
Estimate of Fair Value Measurement [Member] | US Treasury Securities [Member] |  |
Assets: |  |
Available for sale debt securities | 48,951,000 |
Estimate of Fair Value Measurement [Member] | Residential Mortgage Backed Securities [Member] |  |
Assets: |  |
Available for sale debt securities | 4,203,931,000 | 4,169,363,000
Estimate of Fair Value Measurement [Member] | States and Political Subdivisions Debt Securities [Member] |  |
Assets: |  |
Available for sale debt securities | 41,478,000 | 44,557,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] |  |
Assets: |  |
Equity Securities | 5,581,000 | 6,079,000
Marketable Securities | 4,299,941,000 | 4,219,999,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | US Treasury Securities [Member] |  |
Assets: |  |
Available for sale debt securities | 48,951,000 |
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Residential Mortgage Backed Securities [Member] |  |
Assets: |  |
Available for sale debt securities | 4,203,931,000 | 4,169,363,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | States and Political Subdivisions Debt Securities [Member] |  |
Assets: |  |
Available for sale debt securities | 41,478,000 | 44,557,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Equity Securities | 5,581,000 | 6,079,000
Marketable Securities | 5,581,000 | 6,079,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Marketable Securities | 4,294,360,000 | 4,213,920,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |
Assets: |  |
Available for sale debt securities | 48,951,000 |
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities [Member] |  |
Assets: |  |
Available for sale debt securities | 4,203,931,000 | 4,169,363,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | States and Political Subdivisions Debt Securities [Member] |  |
Assets: |  |
Available for sale debt securities | $ 41,478,000 | $ 44,557,000

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