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Goodwill and Other Intangible Assets - Textual (Details) - USD ($) | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Oct. 31, 2019 | Oct. 30, 2019 | Apr. 12, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | $ 1,075,305,000 | $ 1,055,520,000 |  |  |
Goodwill impairment | $ 0 |  |  |  |
Minimum |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Useful life | 10 years |  |  |  |
Maximum |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Useful life | 15 years |  |  |  |
Core Deposit Premium | Minimum |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Useful life | 10 years |  |  |  |
Core Deposit Premium | Maximum |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Useful life | 15 years |  |  |  |
Landrum Company |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  | 131,300,000 | $ 151,125,000 | $ 407,000 |
Goodwill increase | $ 19,800,000 |  |  |  |
Reliance Bancshares, Inc. |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  | $ 78,500,000 |  |  | $ 78,493,000

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