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Investment Securities - Credit Quality Indicators (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Schedule of Held-to-maturity Securities [Line Items] |  |
Investment securities classified as held to maturity | $ 2,570.7 | $ 2,688.4
U.S. Treasury notes |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Investment securities classified as held to maturity | 100.0 | 99.8
State, county, and municipal securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Investment securities classified as held to maturity | 175.8 | 176.3
Obligations of U.S. government agencies |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Investment securities classified as held to maturity | 466.8 | 470.1
Corporate securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Investment securities classified as held to maturity | 40.0 | 57.0
Commercial Mortgage-Backed Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Investment securities classified as held to maturity | 369.7 | 374.9
Residential Mortgage Backed Securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Investment securities classified as held to maturity | 1,013.4 | 1,082.5
Collateralized Mortgage Obligations |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Investment securities classified as held to maturity | $ 405.0 | $ 427.8

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