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Securities - Gross and Net Realized Gains and Losses on Sale of Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | [1] | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  |  |  |  |  |  |  |  | $ 41 | $ 0 | $ 3,986
Gross realized losses |  |  |  |  |  |  |  |  | (67) | 0 | (986)
Net Realized (Losses)/Gains | $ (26) | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ (26) | $ 0 | $ 3,000
[1] | The DNB Merger is included in our consolidated financial statements beginning on December 1, 2019.

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