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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 | Jun. 30, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Related allowance | $ 10.5 | $ 10.8
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
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value Measured on a Non-recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | 0.0 | 0.0
Other real estate owned | 0.0 | 0.0
Long-lived assets to be disposed of by sale | 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 | 50.3 | 46.6
Deferred compensation plan assets | 12.5 | 12.2
Deferred compensation plan liabilities | 12.5 | 12.2
Significant Other Observable Inputs (Level 2) | Fair Value Measured on a Non-recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | 0.0 | 0.0
Other real estate owned | 0.0 | 0.0
Long-lived assets to be disposed of by sale | 0.0 | 0.0
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
Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans |  | 32.6
Other real estate owned | 0.8 | 1.3
Long-lived assets to be disposed of by sale | 3.5 | 0.8
Related allowance | 10.5 | 10.8
Partial loan charge-offs | 5.9 | 11.4
U.S. 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
U.S. 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: | 1.9 | 3.2
U.S. 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: | 543.2 | 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: | 1,459.9 | 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: | 78.4 | 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: | 92.1 | 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: | 2.5 | 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: | 2,178.0 | 2,208.7
Loans held for sale | 50.3 |
Derivative assets: | 11.8 | 8.8
Derivative liabilities: | 9.7 | 7.9
Deferred compensation plan assets | 12.5 | 12.2
Deferred compensation plan liabilities | 12.5 | 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 | 50.3 | 46.6
Deferred compensation plan assets | 12.5 | 12.2
Deferred compensation plan liabilities | 12.5 | 12.2
Estimated Fair Value | Fair Value Measured on a Non-recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | 36.0 | 32.6
Other real estate owned | 0.8 | 1.3
Long-lived assets to be disposed of by sale | 3.5 | 0.8
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
Loans held for sale | 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: | 2,178.0 | 2,208.7
Loans held for sale | 50.3 |
Derivative assets: | 11.8 | 8.8
Derivative liabilities: | 9.7 | 7.9
Deferred compensation plan assets | 12.5 | 12.2
Deferred compensation plan liabilities | 12.5 | 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
Loans held for sale | 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
Impaired loans | 36.0 |
Estimated Fair Value | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | 36.0 | 32.6
Estimated Fair Value | U.S. 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: | 1.9 | 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: | 543.2 | 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: | 1,459.9 | 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: | 78.4 | 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: | 92.1 | 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: | 2.5 | 3.0
Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment debt securities available-for-sale: | 2,178.0 | 2,208.7
Loans held for sale | 50.3 |
Derivative assets: | 11.8 | 8.8
Derivative liabilities: | 9.7 | 7.9
Deferred compensation plan assets | 12.5 | 12.2
Deferred compensation plan liabilities | 12.5 | 12.2
Carrying Amount | Significant Unobservable Inputs (Level 3) | Fair Value Measured on a Non-recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | 52.4 | 54.8
Long-lived assets to be disposed of by sale | 4.0 | 0.8
Change During Period | Fair Value Measured on a Non-recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-lived assets to be disposed of by sale | 0.5 | 0.0
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: | 10.1 | 7.5
Derivative liabilities: | 9.3 | 7.8
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: | 10.1 | 7.5
Derivative liabilities: | 9.3 | 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: | 1.7 | 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: | 1.7 | 1.3
Forward 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 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: | 0.4 | 0.1
Forward 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 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: | $ 0.4 | $ 0.1

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