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Fair Value Measurements - Schedule of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring and Non-Recurring Basis (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | $ 10.1 | $ 8.8
Derivative liabilities | 9.4 | 7.9
Deferred compensation plan assets | 12.1 | 12.2
Deferred compensation plan liabilities | 12.1 | 12.2
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 0.0 | 0.0
Deferred compensation plan assets | 0.0 | 0.0
Deferred compensation plan liabilities | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 33.3 | 46.6
Derivative assets |  | 7.5
Derivative liabilities | 8.8 | 7.8
Deferred compensation plan assets | 12.1 | 12.2
Deferred compensation plan liabilities | 12.1 | 12.2
Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 0.0 | 0.0
Deferred compensation plan assets | 0.0 | 0.0
Deferred compensation plan liabilities | 0.0 | 0.0
US Treasury Notes | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 0.0 | 0.0
US Treasury Notes | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 2.6 | 3.2
US Treasury Notes | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 0.0 | 0.0
Obligations of U.S. government agencies | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 0.0 | 0.0
Obligations of U.S. government agencies | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 559.2 | 561.5
Obligations of U.S. government agencies | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 0.0 | 0.0
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 0.0 | 0.0
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 1,544.8 | 1,462.5
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 0.0 | 0.0
Private mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 0.0 | 0.0
Private mortgage-backed securities | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 70.2 | 90.7
Private mortgage-backed securities | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 0.0 | 0.0
Corporate securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 0.0 | 0.0
Corporate securities | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 91.9 | 87.9
Corporate securities | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 0.0 | 0.0
Other Investments | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 0.0 | 0.0
Other Investments | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 2.0 | 3.0
Other Investments | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 0.0 | 0.0
Estimated Fair Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 2,270.7 | 2,208.7
Derivative assets | 10.1 | 8.8
Derivative liabilities | 9.4 | 7.9
Deferred compensation plan assets | 12.1 | 12.2
Deferred compensation plan liabilities | 12.1 | 12.2
Estimated Fair Value | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held for sale | 33.3 | 46.6
Deferred compensation plan assets | 12.1 | 12.2
Deferred compensation plan liabilities | 12.1 | 12.2
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 0.0 | 0.0
Derivative assets | 0.0 | 0.0
Derivative liabilities | 0.0 | 0.0
Deferred compensation plan assets | 0.0 | 0.0
Deferred compensation plan liabilities | 0.0 | 0.0
Estimated Fair Value | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 2,270.7 | 2,208.7
Derivative assets | 10.1 | 8.8
Derivative liabilities | 9.4 | 7.9
Deferred compensation plan assets | 12.1 | 12.2
Deferred compensation plan liabilities | 12.1 | 12.2
Estimated Fair Value | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 0.0 | 0.0
Derivative assets | 0.0 | 0.0
Derivative liabilities | 0.0 | 0.0
Deferred compensation plan assets | 0.0 | 0.0
Deferred compensation plan liabilities | 0.0 | 0.0
Estimated Fair Value | US Treasury Notes | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 2.6 | 3.2
Estimated Fair Value | Obligations of U.S. government agencies | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 559.2 | 561.5
Estimated Fair Value | U.S. agency residential mortgage-backed securities & collateralized mortgage obligations | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 1,544.8 | 1,462.5
Estimated Fair Value | Private mortgage-backed securities | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 70.2 | 90.7
Estimated Fair Value | Corporate securities | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 91.9 | 87.9
Estimated Fair Value | Other Investments | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale | 2.0 | 3.0
Interest Rate Swap |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 8.8 | 7.5
Derivative liabilities | 8.8 | 7.8
Interest Rate Swap | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 0.0 | 0.0
Derivative liabilities | 0.0 | 0.0
Interest Rate Swap | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 8.8 |
Interest Rate Swap | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 0.0 | 0.0
Derivative liabilities | 0.0 | 0.0
Interest Rate Swap | Estimated Fair Value | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 8.8 | 7.5
Derivative liabilities | 8.8 | 7.8
Interest rate lock commitments | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 0.0 | 0.0
Interest rate lock commitments | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 1.3 | 1.3
Interest rate lock commitments | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 0.0 | 0.0
Interest rate lock commitments | Estimated Fair Value | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 1.3 | 1.3
Forward loan sales contracts | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | 0.0 | 0.0
Forward loan sales contracts | Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | 0.6 | 0.1
Forward loan sales contracts | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | 0.0 | 0.0
Forward loan sales contracts | Estimated Fair Value | Fair Value Measured on a Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | $ 0.6 | $ 0.1

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