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Fair Value - Fair Value By Level (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |
Available for sale debt securities | $ 4,987,916 | $ 4,822,341
Equity Securities | 5,394 | 5,417
Estimate of Fair Value Measurement |  |
Assets: |  |
Available for sale debt securities | 4,987,916 | 4,822,341
Estimate of Fair Value Measurement | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 4,835,176 | 4,660,099
Estimate of Fair Value Measurement | States and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 152,740 | 162,242
Recurring | Fair Value, Inputs, Level 1 |  |
Assets: |  |
Equity Securities | 5,394 | 5,417
Marketable Securities | 5,394 | 5,417
Recurring | Fair Value, Inputs, Level 2 |  |
Assets: |  |
Marketable Securities | 4,987,917 | 4,822,341
Recurring | Fair Value, Inputs, Level 2 | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 4,835,176 | 4,660,099
Recurring | Fair Value, Inputs, Level 2 | States and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 152,741 | 162,242
Recurring | Estimate of Fair Value Measurement |  |
Assets: |  |
Equity Securities | 5,394 | 5,417
Marketable Securities | 4,993,311 | 4,827,758
Recurring | Estimate of Fair Value Measurement | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 4,835,176 | 4,660,099
Recurring | Estimate of Fair Value Measurement | States and political subdivisions |  |
Assets: |  |
Available for sale debt securities | $ 152,741 | $ 162,242

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