Debt Securities Held-to-maturity - Weighted average yield and contractual maturities of debt securities HTM - Parenthetical (Details) - Held To Maturity Debt Securities - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
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| Schedule of Held-to-maturity Securities [Line Items] | ||
| Debt securities net unrealized loss remaining in AOCI included in book value for AFS securities transferred to HTM securities | $ 245.0 | $ 293.0 |
| Asset Not Pledged as Collateral | ||
| Schedule of Held-to-maturity Securities [Line Items] | ||
| Debt securities | 94.9 | 98.8 |
| Asset pledged as collateral | ||
| Schedule of Held-to-maturity Securities [Line Items] | ||
| Debt securities | $ 6,900.0 | $ 7,300.0 |
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- Definition Amount of investment in debt security measured at carrying value which includes net unrealized loss which remains in Accumulated other comprehensive income related to certain securities transferred from the Available for Sale securities portfolio to the Held to Maturity securities portfolio. No definition available.
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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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