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Derivatives and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Derivative Asset, Notional Amount | $ 526.1 | $ 454.3
Derivative Asset, Estimated Fair Value | 14.6 | 10.1
Notional amount of terminated commitment | 539.6 | 467.9
Derivative Liabilities, Estimated Fair Value | 13.5 | 9.4
Not Designated as Hedging Instrument | Interest rate swap contracts |  |
Derivative [Line Items] |  |
Derivative Asset, Notional Amount | 449.2 | 403.3
Derivative Asset, Estimated Fair Value | 12.7 | 8.8
Notional amount of terminated commitment | 449.2 | 403.3
Derivative Liabilities, Estimated Fair Value | 12.7 | 8.8
Not Designated as Hedging Instrument | Interest rate lock commitments |  |
Derivative [Line Items] |  |
Derivative Asset, Notional Amount | 76.9 | 51.0
Derivative Asset, Estimated Fair Value | 1.9 | 1.3
Not Designated as Hedging Instrument | Forward loan sales contracts |  |
Derivative [Line Items] |  |
Notional amount of terminated commitment | 90.4 | 64.6
Derivative Liabilities, Estimated Fair Value | $ 0.8 | $ 0.6

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