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Business Combinations (Schedule of Fair Value of Net Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 861,291 | $ 790,972 | $ 745,523
MidSouth [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash and due from banks | 28,060 |  |
Interest bearing bank deposits | 318,914 |  |
Federal funds sold | 3,475 |  |
Securities available for sale | 272,406 |  |
Loans | 785,204 |  |
Property and equipment | 30,164 |  |
Other real estate | 435 |  |
Identifiable intangible assets | 35,000 |  |
Other assets | 56,860 |  |
Total identifiable assets | 1,530,518 |  |
Deposit liabilities | 1,281,078 |  |
Short term borrowings | 66,996 |  |
Long term debt | 13,919 |  |
Other liabilities | 43,883 |  |
Total liabilities | 1,405,876 |  |
Net assets acquired | 124,642 |  |
Value of stock-based consideration | 193,849 |  |
Goodwill | $ 69,207 |  |

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