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Fair Value Measurements - Fair Value By Level (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Assets: |  |
Available for sale debt securities | $ 5,012,584,000 | $ 4,822,341,000
Equity Securities | 5,538,000 | 5,417,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net | 0 |
Estimate of Fair Value Measurement |  |
Assets: |  |
Available for sale debt securities | 5,012,584,000 | 4,822,341,000
Estimate of Fair Value Measurement | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 4,855,608,000 | 4,660,099,000
Estimate of Fair Value Measurement | States and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 156,976,000 | 162,242,000
Recurring | Estimate of Fair Value Measurement |  |
Assets: |  |
Equity Securities | 5,538,000 | 5,417,000
Marketable Securities | 5,018,121,000 | 4,827,758,000
Recurring | Estimate of Fair Value Measurement | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 4,855,607,000 | 4,660,099,000
Recurring | Estimate of Fair Value Measurement | States and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 156,976,000 | 162,242,000
Recurring | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 |  |
Assets: |  |
Equity Securities | 5,538,000 | 5,417,000
Marketable Securities | 5,538,000 | 5,417,000
Recurring | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 |  |
Assets: |  |
Marketable Securities | 5,012,583,000 | 4,822,341,000
Recurring | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 4,855,607,000 | 4,660,099,000
Recurring | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | States and political subdivisions |  |
Assets: |  |
Available for sale debt securities | $ 156,976,000 | $ 162,242,000

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