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Mergers and Acquisitions - Narrative (Details) $ in Thousands |  |  |  | 3 Months Ended | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 23, 2021 | Feb. 01, 2021 USD ($) | Jun. 07, 2020 USD ($) shares | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Mergers and Acquisitions |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 1,563,942 |  | $ 1,581,085 | $ 1,563,942 | $ 1,002,900
Assets |  |  |  | 37,789,873 |  | 41,960,032 | 37,789,873 |
CSFL |  |  |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |  |  |
Shares of the common stock in exchange for each share |  |  | 0.3001 |  |  |  |  |
Number of shares issued as consideration | shares |  |  | 37,271,069 |  |  |  |  |
Purchase price |  |  | $ 2,256,708 |  |  |  |  |
Value of the conversion of outstanding stock options and restricted stock |  |  | 10,300 | 10,300 | $ 15,500 |  |  |
Purchased price decreased |  |  |  | 5,200 |  |  |  |
Loans at fair value acquired after initial fair value adjustment |  |  | 13,000,000 |  |  |  |  |
Estimated discount on loans |  |  | $ 239,500 |  |  |  |  |
Estimated discount on loans (as a percent) |  |  | 1.82% |  |  |  |  |
Fair value adjustment on loans acquired |  |  | $ 29,800 |  |  |  |  |
Loans acquired as a percentage of total loans |  |  | 113.90% |  |  |  |  |
Credit deficiencies that were identified as Purchased Credit Deteriorated ("PCD") loans. |  |  | $ 3,100,000 |  |  |  |  |
Estimated fair value of intangible asset |  |  | 140,862 |  |  |  |  |
Goodwill |  |  | 562,370 |  |  |  |  |
Acquisition costs |  |  |  |  |  | 64,400 | 83,000 |
CSFL | Core deposit intangibles |  |  |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |  |  |
Estimated fair value of intangible asset |  |  | $ 125,900 |  |  |  |  |
Estimated economic life of intangible asset |  |  | 10 years |  |  |  |  |
Duncan-Williams, Inc. |  |  |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |  |  |
Purchase price |  | $ 48,300 |  |  |  |  |  |
Goodwill |  | $ 15,800 |  |  |  |  |  |
Atlantic Capital |  |  |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |  |  |
Shares of the common stock in exchange for each share | 0.36 |  |  |  |  |  |  |
Assets |  |  |  |  |  | 3,800 |  |
Loans |  |  |  |  |  | 2,400 |  |
Deposits |  |  |  |  |  | 3,300 |  |
Subsequent Fair Value Adjustments | CSFL |  |  |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |  |  |
Estimated fair value of intangible asset |  |  | $ 10,000 |  | $ 10,000 |  |  |
Goodwill |  |  | $ (38,113) | $ 562,400 |  | $ 38,100 | $ 562,400 |

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