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Off-Balance Sheet Credit Risk (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Sep. 30, 2021 | Dec. 31, 2021
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 | $ 2,600.0 |  | $ 2,300.0
Fair value of collateral securities sold or repledged | 530.2 |  | 385.5
Outstanding commitments to originate loans | 723.3 |  | 545.5
Letters of credit outstanding | 23.9 |  | 22.9
Unfunded Commitment [Member] |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Expected credit losses for unfunded credit loss | 22.6 |  |
Unused Lines Of Credit [Member] |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |
Unused lines of credit to commercial and consumer borrowers | $ 3,700.0 |  | $ 3,100.0
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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