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Commitments and Credit Risk - Lines of Credit (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Commitments and Credit Risk |  |
Letters of credit outstanding, amount | $ 16.5 | $ 16.7
Commercial lines of credit |  |
Commitments and Credit Risk |  |
Letters of credit outstanding, amount | 1,000.0 | 1,800.0
Open-end consumer lines of credit |  |
Commitments and Credit Risk |  |
Letters of credit outstanding, amount | $ 204.0 | $ 199.2

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