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Borrowings and Other Obligations - Lines of Credit and Borrowing Agreements (Details) - Line of Credit - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Federal Reserve Bank Advances |  |
Line of Credit Facility [Line Items] |  |
Lines of credit | $ 64.0 | $ 58.7
FHLB short-term borrowings |  |
Line of Credit Facility [Line Items] |  |
Lines of credit | 1,009.0 | 711.6
Federal Funds Purchased | Unsecured Debt |  |
Line of Credit Facility [Line Items] |  |
Lines of credit | 135.0 | $ 150.0
Federal Reserve Bank Advances | Pledged to the Federal Reserve "BTFP" |  |
Line of Credit Facility [Line Items] |  |
Lines of credit | $ 270.2 |

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