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Other Comprehensive Income/Loss (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, | 2025 | 2024 |  | 2025 | 2024 |  | 2025 | 2024
Investment securities available-for sale: |  |  |  |  |  |  |  |
Change in net unrealized gains (losses) during the period | $ | 70.7 |  | $ | (26.4) |  |  | $ | (17.7) |  | $ | 6.6 |  |  | $ | 53.0 |  | $ | (19.8) |
Net change in unamortized losses on available-for-sale securities transferred into held-to-maturity | — |  | (0.2) |  |  | — |  | — |  |  | — |  | (0.2) |
Cash flow hedge: |  |  |  |  |  |  |  |
Change in unrealized gains (losses) on derivatives | 1.0 |  | (17.4) |  |  | (0.3) |  | 4.4 |  |  | 0.7 |  | (13.0) |
Reclassification adjustment for derivatives net losses included in net income | 1.0 |  | 3.5 |  |  | (0.3) |  | (0.9) |  |  | 0.7 |  | 2.6 |
Total other comprehensive income (loss) | $ | 72.7 |  | $ | (40.5) |  |  | $ | (18.3) |  | $ | 10.1 |  |  | $ | 54.4 |  | $ | (30.4) |
Schedule of Accumulated Other Comprehensive Income (Loss) | The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
| March 31, 2025 |  | December 31, 2024
Net unrealized loss on investment securities available-for-sale | $ | (260.6) |  |  | $ | (313.6) |
Net unrealized loss on investment securities transferred to held-to-maturity | (5.9) |  |  | (5.9) |
Net unrealized loss on derivatives | (1.0) |  |  | (2.4) |
Net accumulated other comprehensive loss | $ | (267.5) |  |  | $ | (321.9) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
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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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