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Fair Value - Fair Value By Level (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Assets: |  |
Available for sale debt securities | $ 4,966,268 | $ 4,987,916
Equity Securities | 5,573 | 5,394
Estimate of Fair Value Measurement |  |
Assets: |  |
Available for sale debt securities | 4,966,268 | 4,987,916
Estimate of Fair Value Measurement | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 4,830,588 | 4,835,176
Estimate of Fair Value Measurement | States and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 135,680 | 152,740
Recurring | Estimate of Fair Value Measurement |  |
Assets: |  |
Equity Securities | 5,573 | 5,394
Marketable Securities | 4,971,841 | 4,993,311
Recurring | Estimate of Fair Value Measurement | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 4,830,588 | 4,835,176
Recurring | Estimate of Fair Value Measurement | States and political subdivisions |  |
Assets: |  |
Available for sale debt securities | 135,680 | 152,741
Recurring | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1 |  |
Assets: |  |
Equity Securities | 5,573 | 5,394
Marketable Securities | 5,573 | 5,394
Recurring | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 |  |
Assets: |  |
Marketable Securities | 4,966,268 | 4,987,917
Recurring | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Residential mortgage-backed securities |  |
Assets: |  |
Available for sale debt securities | 4,830,588 | 4,835,176
Recurring | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | States and political subdivisions |  |
Assets: |  |
Available for sale debt securities | $ 135,680 | $ 152,741

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