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Loans - Credit risk profile by risk grade of acquired credit impaired loans (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Loans |  |  |
Total loans | $ 24,664,134 | $ 11,375,104 |
Commercial loans | Construction and land development |  |  |
Loans |  |  |
Total loans | 1,899,066 | 1,017,261 |
Commercial loans | Commercial and industrial |  |  |
Loans |  |  |
Total loans | 5,047,147 | 1,386,327 |
Consumer | Consumer |  |  |
Loans |  |  |
Total loans | $ 894,334 | 663,422 |
Acquired credit impaired loans |  |  |
Loans |  |  |
Total loans |  | 361,846 | $ 489,723
Acquired credit impaired loans | Pass |  |  |
Loans |  |  |
Total loans |  | 218,364 |
Acquired credit impaired loans | Special mention |  |  |
Loans |  |  |
Total loans |  | 58,281 |
Acquired credit impaired loans | Substandard |  |  |
Loans |  |  |
Total loans |  | 85,201 |
Acquired credit impaired loans | Construction and land development |  |  |
Loans |  |  |
Total loans |  | 25,032 | 32,942
Acquired credit impaired loans | Consumer |  |  |
Loans |  |  |
Total loans |  | 35,488 | 42,492
Acquired credit impaired loans | Commercial and industrial |  |  |
Loans |  |  |
Total loans |  | 7,029 | 10,043
Acquired credit impaired loans | Commercial loans | Real estate |  |  |
Loans |  |  |
Total loans |  | 130,938 | 196,764
Acquired credit impaired loans | Commercial loans | Real estate | Pass |  |  |
Loans |  |  |
Total loans |  | 108,762 |
Acquired credit impaired loans | Commercial loans | Real estate | Special mention |  |  |
Loans |  |  |
Total loans |  | 6,465 |
Acquired credit impaired loans | Commercial loans | Real estate | Substandard |  |  |
Loans |  |  |
Total loans |  | 15,711 |
Acquired credit impaired loans | Commercial loans | Construction and land development |  |  |
Loans |  |  |
Total loans |  | 25,032 |
Acquired credit impaired loans | Commercial loans | Construction and land development | Pass |  |  |
Loans |  |  |
Total loans |  | 17,756 |
Acquired credit impaired loans | Commercial loans | Construction and land development | Special mention |  |  |
Loans |  |  |
Total loans |  | 2,904 |
Acquired credit impaired loans | Commercial loans | Construction and land development | Substandard |  |  |
Loans |  |  |
Total loans |  | 4,372 |
Acquired credit impaired loans | Commercial loans | Commercial and industrial |  |  |
Loans |  |  |
Total loans |  | 7,029 |
Acquired credit impaired loans | Consumer | Real estate |  |  |
Loans |  |  |
Total loans |  | 163,359 | $ 207,482
Acquired credit impaired loans | Consumer | Real estate | Pass |  |  |
Loans |  |  |
Total loans |  | 82,203 |
Acquired credit impaired loans | Consumer | Real estate | Special mention |  |  |
Loans |  |  |
Total loans |  | 35,968 |
Acquired credit impaired loans | Consumer | Real estate | Substandard |  |  |
Loans |  |  |
Total loans |  | 45,188 |
Acquired credit impaired loans | Consumer | Consumer |  |  |
Loans |  |  |
Total loans |  | 35,488 |
Acquired credit impaired loans | Consumer | Consumer | Pass |  |  |
Loans |  |  |
Total loans |  | 4,483 |
Acquired credit impaired loans | Consumer | Consumer | Special mention |  |  |
Loans |  |  |
Total loans |  | 12,658 |
Acquired credit impaired loans | Consumer | Consumer | Substandard |  |  |
Loans |  |  |
Total loans |  | 18,347 |
Acquired credit impaired loans | Consumer | Commercial and industrial |  |  |
Loans |  |  |
Total loans |  | 7,029 |
Acquired credit impaired loans | Consumer | Commercial and industrial | Pass |  |  |
Loans |  |  |
Total loans |  | 5,160 |
Acquired credit impaired loans | Consumer | Commercial and industrial | Special mention |  |  |
Loans |  |  |
Total loans |  | 286 |
Acquired credit impaired loans | Consumer | Commercial and industrial | Substandard |  |  |
Loans |  |  |
Total loans |  | $ 1,583 |

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