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Off-Balance Sheet Credit Risk (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
General settlement period of securities transactions | 2 days |
Fair value of securities accepted as collateral permitted to sell or repledge | $ 1,600.0 | $ 1,800.0
Fair value of collateral securities sold or repledged | 417.6 | 212.0
Outstanding commitments to originate loans | 103.6 | 164.6
Letters of credit outstanding | 37.1 | 22.9
Unfunded Commitment [Member] |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
Unused lines of credit to commercial and consumer borrowers | 33.3 | 36.2
Unused Lines Of Credit [Member] |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
Unused lines of credit to commercial and consumer borrowers | $ 6,300.0 | $ 6,100.0
Standby Letters of Credit [Member] | Maximum [Member] |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |
Letters of credit, expiration period | 1 year |

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