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Investment Securities - Amortized Cost and Approximate Fair Values of Investment Securities (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Available-for-Sale: |  |  |  |  |  |
Gross Unrealized Gains | $ 3.2 | $ 3.2 |  |  |  |
Gross Unrealized Losses | (469.5) | (493.4) |  |  |  |
Held-to-Maturity: |  |  |  |  |  |
Investment securities classified as held to maturity | 3,208.7 | 2,799.2 |  |  |  |
Allowance for Credit Losses | (0.8) | (0.7) | $ (0.7) | $ (0.7) | $ (0.7) | $ (1.9)
Net Amortized Cost | 3,207.9 | 2,798.5 |  |  |  |
Gross Unrealized Gains | 0.4 | 0.1 |  |  |  |
Gross Unrealized Losses | (334.3) | (358.2) |  |  |  |
Investment debt securities held-to-maturity | 2,874.0 | 2,440.4 |  |  |  |
Debt Securities, Held-To-Maturity, Transfer, Unamortized Gain | 10.7 |  |  |  |  |
Debt Securities, Held-To-Maturity, Transfer, Unamortized Loss | (18.1) |  |  |  |  |
Estimated Fair Value | 5,841.5 | 5,603.1 |  |  |  |
Allowance for Credit Losses | 0.0 | 0.0 | $ 0.0 | $ (1.4) | $ (2.6) | $ 0.0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 6,307.8 | 6,093.3 |  |  |  |
Investment Securities, Primarily Classified As Available-For-Sale, Callable, Within One Year, Fair Value |  | 1,541.6 |  |  |  |
Investment Securities, Primarily Classified As Available-For-Sale, Callable, Within One Year, Amortized Cost Basis |  | 1,595.1 |  |  |  |
U.S. Treasury notes |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |  |  |
Gross Unrealized Losses | (25.5) | (27.3) |  |  |  |
Held-to-Maturity: |  |  |  |  |  |
Investment securities classified as held to maturity | 399.0 | 99.5 |  |  |  |
Allowance for Credit Losses | 0.0 | 0.0 |  |  |  |
Net Amortized Cost | 399.0 | 99.5 |  |  |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |  |  |
Gross Unrealized Losses | (2.8) | (1.6) |  |  |  |
Investment debt securities held-to-maturity | 396.2 | 97.9 |  |  |  |
Estimated Fair Value | 224.7 | 222.9 |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 250.2 | 250.2 |  |  |  |
State, county, and municipal securities |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |  |  |
Gross Unrealized Losses | (36.9) | (40.9) |  |  |  |
Held-to-Maturity: |  |  |  |  |  |
Investment securities classified as held to maturity | 179.2 | 178.2 |  |  |  |
Allowance for Credit Losses | 0.0 | 0.0 |  |  |  |
Net Amortized Cost | 179.2 | 178.2 |  |  |  |
Gross Unrealized Gains | 0.2 | 0.1 |  |  |  |
Gross Unrealized Losses | (24.2) | (26.7) |  |  |  |
Investment debt securities held-to-maturity | 155.2 | 151.6 |  |  |  |
Estimated Fair Value | 219.8 | 213.0 |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 256.7 | 253.9 |  |  |  |
Obligations of U.S. government agencies |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |  |  |
Gross Unrealized Losses | (10.9) | (11.6) |  |  |  |
Held-to-Maturity: |  |  |  |  |  |
Investment securities classified as held to maturity | 354.5 | 356.0 |  |  |  |
Allowance for Credit Losses | 0.0 | 0.0 |  |  |  |
Net Amortized Cost | 354.5 | 356.0 |  |  |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |  |  |
Gross Unrealized Losses | (42.4) | (44.9) |  |  |  |
Investment debt securities held-to-maturity | 312.1 | 311.1 |  |  |  |
Estimated Fair Value | 168.5 | 162.9 |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 179.4 | 174.5 |  |  |  |
Corporate Debt Securities |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |  |  |
Gross Unrealized Losses | (24.4) | (22.4) |  |  |  |
Held-to-Maturity: |  |  |  |  |  |
Investment securities classified as held to maturity | 57.0 | 57.0 |  |  |  |
Allowance for Credit Losses | (0.8) | (0.7) |  |  |  |
Net Amortized Cost | 56.2 | 56.3 |  |  |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |  |  |
Gross Unrealized Losses | (6.0) | (6.4) |  |  |  |
Investment debt securities held-to-maturity | 50.2 | 49.9 |  |  |  |
Estimated Fair Value | 236.4 | 237.8 |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 260.8 | 260.2 |  |  |  |
Collateralized Mortgage Obligations |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Gross Unrealized Gains | 1.3 | 0.7 |  |  |  |
Gross Unrealized Losses | (120.3) | (126.1) |  |  |  |
Held-to-Maturity: |  |  |  |  |  |
Investment securities classified as held to maturity | 475.9 | 452.7 |  |  |  |
Allowance for Credit Losses | 0.0 | 0.0 |  |  |  |
Net Amortized Cost | 475.9 | 452.7 |  |  |  |
Gross Unrealized Gains | 0.2 | 0.0 |  |  |  |
Gross Unrealized Losses | (69.0) | (72.0) |  |  |  |
Investment debt securities held-to-maturity | 407.1 | 380.7 |  |  |  |
Estimated Fair Value | 1,189.5 | 1,124.6 |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 1,308.5 | 1,250.0 |  |  |  |
Commercial Mortgage-Backed Securities |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Gross Unrealized Gains | 0.6 | 0.3 |  |  |  |
Gross Unrealized Losses | (87.7) | (92.2) |  |  |  |
Held-to-Maturity: |  |  |  |  |  |
Investment securities classified as held to maturity | 510.5 | 496.2 |  |  |  |
Allowance for Credit Losses | 0.0 | 0.0 |  |  |  |
Net Amortized Cost | 510.5 | 496.2 |  |  |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |  |  |
Gross Unrealized Losses | (52.9) | (57.9) |  |  |  |
Investment debt securities held-to-maturity | 457.6 | 438.3 |  |  |  |
Estimated Fair Value | 1,105.6 | 1,107.7 |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 1,192.7 | 1,199.6 |  |  |  |
Residential Mortgage Backed Securities |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Gross Unrealized Gains | 1.2 | 0.4 |  |  |  |
Gross Unrealized Losses | (130.6) | (141.3) |  |  |  |
Held-to-Maturity: |  |  |  |  |  |
Investment securities classified as held to maturity | 1,232.6 | 1,159.6 |  |  |  |
Allowance for Credit Losses | 0.0 | 0.0 |  |  |  |
Net Amortized Cost | 1,232.6 | 1,159.6 |  |  |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |  |  |
Gross Unrealized Losses | (137.0) | (148.7) |  |  |  |
Investment debt securities held-to-maturity | 1,095.6 | 1,010.9 |  |  |  |
Estimated Fair Value | 1,366.9 | 1,267.2 |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 1,496.3 | 1,408.1 |  |  |  |
Private mortgage-backed securities |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |  |  |
Gross Unrealized Losses | (30.9) | (31.6) |  |  |  |
Held-to-Maturity: |  |  |  |  |  |
Estimated Fair Value | 210.4 | 198.4 |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 241.3 | 230.0 |  |  |  |
Collateralized Loan Obligations |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Gross Unrealized Gains | 0.1 | 1.8 |  |  |  |
Gross Unrealized Losses | (2.3) | 0.0 |  |  |  |
Held-to-Maturity: |  |  |  |  |  |
Estimated Fair Value | 1,119.7 | 1,068.6 |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | $ 1,121.9 | $ 1,066.8 |  |  |  |

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