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Commitments and Credit Risk - Lines of Credit (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Commitments and Credit Risk |  |
Letters of credit outstanding, amount | $ 16.8 | $ 16.5
Commercial lines of credit |  |
Commitments and Credit Risk |  |
Letters of credit outstanding, amount | 993.8 | 1,000.0
Open-end consumer lines of credit |  |
Commitments and Credit Risk |  |
Letters of credit outstanding, amount | $ 205.6 | $ 204.0

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