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Fair Value (Fair Value By Level) (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets: |  |
Available for sale debt securities | $ 4,417,796,000 | $ 4,213,920,000
Equity Securities | 5,358,000 | 6,079,000
Estimate of Fair Value Measurement | US Treasury Securities |  |
Assets: |  |
Available for sale debt securities | 49,393,000 |
Estimate of Fair Value Measurement | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 4,209,212,000 | 4,169,363,000
Estimate of Fair Value Measurement | States and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 159,191,000 | 44,557,000
Fair Value, Measurements, Recurring [Member] | US Treasury Securities |  |
Assets: |  |
Available for sale debt securities | 49,393,000 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 |  |
Assets: |  |
Equity Securities | 5,358,000 | 6,079,000
Marketable Securities | 5,358,000 | 6,079,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 |  |
Assets: |  |
Marketable Securities | 4,417,796,000 | 4,213,920,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | US Treasury Securities |  |
Assets: |  |
Available for sale debt securities | 49,393,000 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 4,209,212,000 | 4,169,363,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 | States and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 159,191,000 | 44,557,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement |  |
Assets: |  |
Equity Securities | 5,358,000 | 6,079,000
Marketable Securities | 4,423,154,000 | 4,219,999,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 4,209,212,000 | 4,169,363,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | States and political subdivisions |  |
Assets: |  |
Available for sale debt securities | $ 159,191,000 | $ 44,557,000

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