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v3.20.4

Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 31, 2019 | Apr. 12, 2019
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 1,075,305 | $ 1,055,520 |  |  |
Amortization of intangibles | $ 13,495 | 11,805 | $ 11,009 |  |
Minimum |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Finite-lived intangible asset, useful life | 10 years |  |  |  |
Maximum |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Finite-lived intangible asset, useful life | 15 years |  |  |  |
Core deposit intangible |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Amortization of intangibles | $ 12,121 | 10,694 | 9,500 |  |
Core deposit intangible | Minimum |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Finite-lived intangible asset, useful life | 10 years |  |  |  |
Core deposit intangible | Maximum |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Finite-lived intangible asset, useful life | 15 years |  |  |  |
Books of Business Intangible |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Amortization of intangibles | $ 1,372 | $ 1,111 | $ 1,400 |  |
Landrum Company |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 131,300 |  |  | $ 151,125 |
Goodwill increase | 19,800 |  |  |  |
Reliance Bancshares, Inc. |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 78,500 |  |  |  | $ 78,493

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