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Business Combinations (Schedule of Fair Value of Net Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 21, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 855,453 | $ 855,453 |  | $ 790,972
MidSouth [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and due from banks | 28,059 |  |  |
Interest bearing bank deposits | 276,911 |  |  |
Federal funds sold | 3,475 |  |  |
Securities available for sale | 272,240 |  |  |
Loans | 787,628 |  |  |
Property and equipment | 34,288 |  |  |
Other real estate | 343 |  |  |
Identifiable intangible assets | 31,500 |  |  |
Other assets | 79,888 |  |  |
Total identifiable assets | 1,514,332 |  |  |
Deposit liabilities | 1,280,947 |  |  |
Short term borrowings | 66,996 |  |  |
Long term debt | 13,919 |  |  |
Other liabilities | 21,990 |  |  |
Total liabilities | 1,383,852 |  |  |
Net assets acquired | 130,480 |  | $ 130,500 |
Value of stock-based consideration | 193,849 |  |  |
Goodwill | $ 63,369 |  | $ 63,400 |

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