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Equity - Capital Purchase Program Warrants (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Warrants outstanding |  |  |  |  |  | 1,900,000
Treasury Stock, Shares, Acquired |  | 500,000 |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  | $ 27.0 |  |  |  |
Warrant [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Warrants Exercised |  | 1,000,000.0 | 100,000 | 1,900,000 | 100,000 |
Subsequent Event [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 0.3 |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 16.0 |  |  |  |  |

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