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Other Comprehensive Income/Loss (Tables) | 6 Months Ended
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Jun. 30, 2025
Equity [Abstract] |
Schedule of Other Comprehensive Income and Related Tax Effects | The gross amounts of each component of other comprehensive loss and the related tax effects for the periods indicated are as follows:
| Pre-tax |  | Tax (Expense) Benefit |  | Net of Tax
Three Months Ended June 30, | 2025 | 2024 |  | 2025 | 2024 |  | 2025 | 2024
Investment securities available-for sale: |  |  |  |  |  |  |  |
Change in net unrealized gains during the period | $ | 44.7 |  | $ | 2.5 |  |  | $ | (11.1) |  | $ | (0.7) |  |  | $ | 33.6 |  | $ | 1.8 |
Net change in unamortized losses on available-for-sale securities transferred into held-to-maturity | (0.1) |  | (0.1) |  |  | — |  | — |  |  | (0.1) |  | (0.1) |
Cash flow hedge: |  |  |  |  |  |  |  |
Change in unrealized gains (losses) on derivatives | 0.9 |  | (5.1) |  |  | (0.1) |  | 1.4 |  |  | 0.8 |  | (3.7) |
Reclassification adjustment for derivatives net losses included in net income | 0.4 |  | 4.6 |  |  | (0.1) |  | (1.2) |  |  | 0.3 |  | 3.4 |
Total other comprehensive income | $ | 45.9 |  | $ | 1.9 |  |  | $ | (11.3) |  | $ | (0.5) |  |  | $ | 34.6 |  | $ | 1.4 |
| Pre-tax |  | Tax (Expense) Benefit |  | Net of Tax
Six Months Ended June 30, | 2025 | 2024 |  | 2025 | 2024 |  | 2025 | 2024
Investment securities available-for sale: |  |  |  |  |  |  |  |
Change in net unrealized gains (losses) during the period | $ | 115.4 |  | $ | (23.9) |  |  | $ | (28.8) |  | $ | 5.9 |  |  | $ | 86.6 |  | $ | (18.0) |
Net change in unamortized losses on available-for-sale securities transferred into held-to-maturity | (0.1) |  | (0.3) |  |  | — |  | — |  |  | (0.1) |  | (0.3) |
Cash flow hedge: |  |  |  |  |  |  |  |
Change in unrealized gains (losses) on derivatives | 1.9 |  | (22.5) |  |  | (0.4) |  | 5.8 |  |  | 1.5 |  | (16.7) |
Reclassification adjustment for derivatives net losses included in net income | 1.4 |  | 8.1 |  |  | (0.4) |  | (2.1) |  |  | 1.0 |  | 6.0 |
Total other comprehensive income (loss) | $ | 118.6 |  | $ | (38.6) |  |  | $ | (29.6) |  | $ | 9.6 |  |  | $ | 89.0 |  | $ | (29.0) |
Schedule of Accumulated Other Comprehensive Income (Loss) | The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
| June 30, 2025 |  | December 31, 2024
Net unrealized loss on investment securities available-for-sale | $ | (227.0) |  |  | $ | (313.6) |
Net unrealized loss on investment securities transferred to held-to-maturity | (6.0) |  |  | (5.9) |
Net unrealized loss on derivatives | 0.1 |  |  | (2.4) |
Net accumulated other comprehensive loss | $ | (232.9) |  |  | $ | (321.9) |

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 1 -Section 45 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-1 + Details
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