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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 855,453,000 | $ 790,972,000 | $ 745,523,000
Goodwill impairment charges | $ 0 | 0 | $ 0
Estimated amortization expense succeeding period | 5 years |  |
Core Deposit Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted-average remaining life | 10 years |  |
Other Identifiable Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted-average remaining life | 15 years |  |
Trust And Asset Management Acquisition [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill |  | $ 46,600,000 |
MidSouth [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 63,369,000 |  |

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