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Derivative Financial Instruments Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |
Assets | $ 21,703,618 |  | $ 21,703,618 |  | $ 20,682,152
Foreign currency open position | 500 |  | 500 |  |
Mortgage Loans Held For Sale [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (loss) in fair values of mortgage loans held for sale | (499) | $ 334 | (174) | $ 207 |
Fulton Bank Subsidiary [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Assets | $ 10,000,000 |  | $ 10,000,000 |  |

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