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Derivatives and Hedging Activities - Notional Amounts and Estimated Fair Values of Derivatives (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 22, 2015
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Derivative [Line Items] |  |  |
Derivative Asset, Notional Amount | $ 404,900,000 | $ 253,800,000 |
Derivative Assets, Estimated Fair Value | 8,800,000 | 2,700,000 |
Derivative Liability, Notional Amount | 433,000,000 | 153,600,000 | $ 100,000,000
Derivative Liabilities, Estimated Fair Value | 7,900,000 | 1,300,000 |
Not Designated as Hedging Instrument | Interest rate swap contracts |  |  |
Derivative [Line Items] |  |  |
Derivative Asset, Notional Amount | 344,200,000 | 53,600,000 |
Derivative Assets, Estimated Fair Value | 7,500,000 | 1,300,000 |
Derivative Liability, Notional Amount | 344,200,000 | 53,600,000 |
Derivative Liabilities, Estimated Fair Value | 7,800,000 | 1,300,000 |
Not Designated as Hedging Instrument | Interest rate lock commitments |  |  |
Derivative [Line Items] |  |  |
Derivative Asset, Notional Amount | 60,700,000 | 73,400,000 |
Derivative Assets, Estimated Fair Value | 1,300,000 | 1,100,000 |
Not Designated as Hedging Instrument | Forward loan sales contracts |  |  |
Derivative [Line Items] |  |  |
Derivative Asset, Notional Amount | 0 | 126,800,000 |
Derivative Assets, Estimated Fair Value | 0 | 300,000 |
Derivative Liability, Notional Amount | 88,800,000 | 0 |
Derivative Liabilities, Estimated Fair Value | 100,000 | 0 |
Designated as Hedging Instrument | Interest rate swap contracts |  |  |
Derivative [Line Items] |  |  |
Derivative Liability, Notional Amount | 0 | 100,000,000 |
Derivative Liabilities, Estimated Fair Value | $ 0 | $ 0 |

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