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Mergers and Acquisitions - Narrative (Details) $ in Thousands | Sep. 01, 2018 USD ($) branch shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill resulting from merger |  | $ 939,683 | $ 932,928 | $ 611,046
Brand Group Holdings, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Transaction value | $ 474,453 |  |  |
Shares issued to common shareholders (in shares) | shares | 9,306,477 |  |  |
Cash consideration paid | $ 21,879 |  |  |
Cash settlement for stock options, net of tax benefit | $ 17,157 |  |  |
Voting interest acquired (percent) | 100.00% |  |  |
Number of locations acquired | branch | 13 |  |  |
Intangible assets, including goodwill | $ 356,171 |  |  |
Goodwill resulting from merger | 328,637 |  |  |
Core deposit intangible | $ 27,534 |  |  |
Weighted average useful life (in years) | 10 years |  |  |

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