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Goodwill and Other Intangible Assets (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Oct. 31, 2019 | Apr. 12, 2019
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  | $ 1,146,007,000 | $ 1,075,305,000 |  |  |
Goodwill impairment | $ 0 | 0 | 0 |  |  |
Amortization of intangibles |  | $ 13,494,000 | 13,495,000 | $ 11,805,000 |  |
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 |  | $ 12,122,000 | 12,121,000 | 10,700,000 |  |
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 |  | $ 1,374,000 | 1,372,000 | 1,100,000 |  |
Landrum Company |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | 131,300,000 | $ 151,125,000 |
Goodwill increase |  |  | $ 19,800,000 |  |  |
Reliance Bancshares, Inc. |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 78,500,000 |  | $ 78,493,000
Triumph |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  | 39,000,000 |  |  |  |
Landmark Bank |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  | $ 31,700,000 |  |  |  |

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