Derivative Financial Instruments Fair Value Hedges Carrying Amount of Hedged Assets and Liabilities and Cumulative Basis Adjustments (Details) - Receive Fixed/Pay Fixed - Designated as Hedging Instrument - Fair Value Hedging - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
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| Derivative Instruments and Hedging Activities Disclosures | ||
| Hedged Asset, Fair Value Hedge, Cumulative Increase | $ 9.2 | $ 24.7 |
| Hedged Asset, Fair Value Hedge | 790.2 | 695.0 |
| hedged asset, amortized cost | $ 891.6 | $ 793.4 |
| Hedged Asset, Statement of Financial Position [Extensible Enumeration] | Debt Securities, Available-for-Sale | Debt Securities, Available-for-Sale |
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- Definition hedged asset, amortized cost No definition available.
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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/exampleRef
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- Definition Amount of asset hedged in fair value hedging relationship. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk. Excludes cumulative basis adjustment related to foreign exchange risk. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Indicates line item in statement of financial position that includes hedged asset. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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