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Fair Value Measurements - Schedule of Estimated Fair Values of Financial Instruments by Level of Valuation Inputs (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financial assets: |  |
Investment debt securities held-to-maturity | $ 2,497.8 | $ 2,874.0
Derivative assets | 44.2 | 37.4
Financial liabilities: |  |
Derivative liabilities | 156.6 | 127.3
Estimated Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 635.0 | 578.0
Investment debt securities available-for-sale | 5,773.3 | 5,841.5
Investment debt securities held-to-maturity | 2,497.8 | 2,874.0
Accrued interest receivable | 125.5 | 129.1
Mortgage servicing rights, net | 40.0 | 38.8
Loans held for sale | 22.7 | 47.4
Net loans held for investment | 17,357.4 | 17,334.4
Derivative assets | 44.2 | 37.4
Deferred compensation plan assets | 19.9 | 19.2
Total financial assets | 26,515.8 | 26,899.8
Financial liabilities: |  |
Total deposits, excluding time deposits | 19,876.1 | 20,313.2
Time deposits | 2,906.3 | 2,981.7
Securities sold under repurchase agreements | 794.2 | 782.7
Other Borrowings | 2,342.0 | 2,603.0
Accrued interest payable | 53.6 | 52.2
Long-term debt | 367.9 | 115.6
Subordinated debentures held by subsidiary trusts | 154.6 | 151.1
Derivative liabilities | 156.6 | 127.3
Deferred compensation plan liabilities | 19.9 | 19.2
Total financial liabilities | 26,671.2 | 27,146.0
Carrying Amount |  |
Financial assets: |  |
Cash and cash equivalents | 635.0 | 578.0
Investment debt securities available-for-sale | 5,773.3 | 5,841.5
Investment debt securities held-to-maturity | 2,852.8 | 3,207.9
Accrued interest receivable | 125.5 | 129.1
Mortgage servicing rights, net | 27.6 | 28.3
Loans held for sale | 22.7 | 47.4
Net loans held for investment | 17,975.1 | 18,051.9
Derivative assets | 44.2 | 37.4
Deferred compensation plan assets | 19.9 | 19.2
Total financial assets | 27,476.1 | 27,940.7
Financial liabilities: |  |
Total deposits, excluding time deposits | 19,876.1 | 20,313.2
Time deposits | 2,933.9 | 3,009.9
Securities sold under repurchase agreements | 794.2 | 782.7
Other Borrowings | 2,342.0 | 2,603.0
Accrued interest payable | 53.6 | 52.2
Long-term debt | 370.8 | 120.8
Subordinated debentures held by subsidiary trusts | 163.1 | 163.1
Derivative liabilities | 156.6 | 127.3
Deferred compensation plan liabilities | 19.9 | 19.2
Total financial liabilities | 26,710.2 | 27,191.4
Quoted Prices in Active Markets for Identical Assets (Level 1) | Estimated Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 635.0 | 578.0
Investment debt securities available-for-sale | 0.0 | 0.0
Investment debt securities held-to-maturity | 0.0 | 0.0
Accrued interest receivable | 0.0 | 0.0
Mortgage servicing rights, net | 0.0 | 0.0
Loans held for sale | 0.0 | 0.0
Net loans held for investment | 0.0 | 0.0
Derivative assets | 0.0 | 0.0
Deferred compensation plan assets | 0.0 | 0.0
Total financial assets | 635.0 | 578.0
Financial liabilities: |  |
Total deposits, excluding time deposits | 19,876.1 | 20,313.2
Time deposits | 0.0 | 0.0
Securities sold under repurchase agreements | 0.0 | 0.0
Other Borrowings | 0.0 | 0.0
Accrued interest payable | 0.0 | 0.0
Long-term debt | 0.0 | 0.0
Subordinated debentures held by subsidiary trusts | 0.0 | 0.0
Derivative liabilities | 0.0 | 0.0
Deferred compensation plan liabilities | 0.0 | 0.0
Total financial liabilities | 19,876.1 | 20,313.2
Significant Other Observable Inputs (Level 2) | Estimated Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 0.0 | 0.0
Investment debt securities available-for-sale | 5,773.3 | 5,841.5
Investment debt securities held-to-maturity | 2,497.8 | 2,874.0
Accrued interest receivable | 125.5 | 129.1
Mortgage servicing rights, net | 40.0 | 38.8
Loans held for sale | 3.2 | 0.5
Net loans held for investment | 17,241.0 | 17,281.8
Derivative assets | 44.2 | 37.4
Deferred compensation plan assets | 19.9 | 19.2
Total financial assets | 25,744.9 | 26,222.3
Financial liabilities: |  |
Total deposits, excluding time deposits | 0.0 | 0.0
Time deposits | 2,906.3 | 2,981.7
Securities sold under repurchase agreements | 794.2 | 782.7
Other Borrowings | 2,342.0 | 2,603.0
Accrued interest payable | 53.6 | 52.2
Long-term debt | 367.9 | 115.6
Subordinated debentures held by subsidiary trusts | 154.6 | 151.1
Derivative liabilities | 156.6 | 127.3
Deferred compensation plan liabilities | 19.9 | 19.2
Total financial liabilities | 6,795.1 | 6,832.8
Significant Unobservable Inputs (Level 3) | Estimated Fair Value |  |
Financial assets: |  |
Cash and cash equivalents | 0.0 | 0.0
Investment debt securities available-for-sale | 0.0 | 0.0
Investment debt securities held-to-maturity | 0.0 | 0.0
Accrued interest receivable | 0.0 | 0.0
Mortgage servicing rights, net | 0.0 | 0.0
Loans held for sale | 19.5 | 46.9
Net loans held for investment | 116.4 | 52.6
Derivative assets | 0.0 | 0.0
Deferred compensation plan assets | 0.0 | 0.0
Total financial assets | 135.9 | 99.5
Financial liabilities: |  |
Total deposits, excluding time deposits | 0.0 | 0.0
Time deposits | 0.0 | 0.0
Securities sold under repurchase agreements | 0.0 | 0.0
Other Borrowings | 0.0 | 0.0
Accrued interest payable | 0.0 | 0.0
Long-term debt | 0.0 | 0.0
Subordinated debentures held by subsidiary trusts | 0.0 | 0.0
Derivative liabilities | 0.0 | 0.0
Deferred compensation plan liabilities | 0.0 | 0.0
Total financial liabilities | $ 0.0 | $ 0.0

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