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Loans - Credit risk profile by risk grade of non acquired loans (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Loans |  |  |  |
Total loans | $ 24,664,134 | $ 11,375,104 |  |
Total loans - ASU 2016-13 | 24,664,134 |  |  |
Other Real Estate, Non Covered | 47,920 | 11,964 | $ 11,410 | $ 11,203
Construction and land development |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 1,899,066 |  |  |
Commercial non-owner occupied |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 5,931,323 |  |  |
Commercial owner occupied real estate loan |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 4,842,092 |  |  |
Commercial and industrial |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 5,047,147 |  |  |
Other income producing property |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 587,448 |  |  |
Consumer Owner Occupied Loans |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 4,108,042 |  |  |
Home equity loans |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 1,336,689 |  |  |
Consumer |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 894,334 |  |  |
Other loans |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 17,993 |  |  |
Commercial loans |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 17,657,996 |  |  |
Commercial loans | Pass |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 16,665,456 |  |  |
Commercial loans | Special mention |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 671,626 |  |  |
Commercial loans | Substandard |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 320,880 |  |  |
Commercial loans | Doubtful |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 34 |  |  |
Commercial loans | Construction and land development |  |  |  |
Loans |  |  |  |
Total loans | 1,899,066 | 1,017,261 |  |
Total loans - ASU 2016-13 | 1,238,265 |  |  |
Commercial loans | Construction and land development | Pass |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 1,190,196 |  |  |
Commercial loans | Construction and land development | Special mention |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 38,152 |  |  |
Commercial loans | Construction and land development | Substandard |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 9,909 |  |  |
Commercial loans | Construction and land development | Doubtful |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 8 |  |  |
Commercial loans | Commercial non-owner occupied |  |  |  |
Loans |  |  |  |
Total loans | 5,931,323 | 2,323,967 |  |
Total loans - ASU 2016-13 | 5,931,323 |  |  |
Commercial loans | Commercial non-owner occupied | Pass |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 5,318,569 |  |  |
Commercial loans | Commercial non-owner occupied | Special mention |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 445,290 |  |  |
Commercial loans | Commercial non-owner occupied | Substandard |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 167,460 |  |  |
Commercial loans | Commercial non-owner occupied | Doubtful |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 4 |  |  |
Commercial loans | Commercial owner occupied real estate loan |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 4,842,092 |  |  |
Commercial loans | Commercial owner occupied real estate loan | Pass |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 4,631,256 |  |  |
Commercial loans | Commercial owner occupied real estate loan | Special mention |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 112,848 |  |  |
Commercial loans | Commercial owner occupied real estate loan | Substandard |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 97,982 |  |  |
Commercial loans | Commercial owner occupied real estate loan | Doubtful |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 6 |  |  |
Commercial loans | Commercial and industrial |  |  |  |
Loans |  |  |  |
Total loans | 5,047,147 | 1,386,327 |  |
Total loans - ASU 2016-13 | 5,047,147 |  |  |
Commercial loans | Commercial and industrial | Pass |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 4,968,038 |  |  |
Commercial loans | Commercial and industrial | Special mention |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 52,704 |  |  |
Commercial loans | Commercial and industrial | Substandard |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 26,395 |  |  |
Commercial loans | Commercial and industrial | Doubtful |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 10 |  |  |
Commercial loans | Other income producing property |  |  |  |
Loans |  |  |  |
Total loans | 587,448 | 346,554 |  |
Total loans - ASU 2016-13 | 546,039 |  |  |
Commercial loans | Other income producing property | Pass |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 509,724 |  |  |
Commercial loans | Other income producing property | Special mention |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 18,148 |  |  |
Commercial loans | Other income producing property | Substandard |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 18,161 |  |  |
Commercial loans | Other income producing property | Doubtful |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 6 |  |  |
Commercial loans | Consumer Owner Occupied Loans |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 35,137 |  |  |
Commercial loans | Consumer Owner Occupied Loans | Pass |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 29,680 |  |  |
Commercial loans | Consumer Owner Occupied Loans | Special mention |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 4,484 |  |  |
Commercial loans | Consumer Owner Occupied Loans | Substandard |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 973 |  |  |
Commercial loans | Other loans |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 17,993 |  |  |
Commercial loans | Other loans | Pass |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 17,993 |  |  |
Consumer |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 7,006,138 |  |  |
Consumer | Construction and land development |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 660,801 |  |  |
Consumer | Other income producing property |  |  |  |
Loans |  |  |  |
Total loans - ASU 2016-13 | 41,409 |  |  |
Consumer | Consumer Owner Occupied Loans |  |  |  |
Loans |  |  |  |
Total loans | 4,108,042 | 2,706,960 |  |
Total loans - ASU 2016-13 | 4,072,905 |  |  |
Consumer | Home equity loans |  |  |  |
Loans |  |  |  |
Total loans | 1,336,689 | 758,020 |  |
Total loans - ASU 2016-13 | 1,336,689 |  |  |
Consumer | Consumer |  |  |  |
Loans |  |  |  |
Total loans | 894,334 | 663,422 |  |
Total loans - ASU 2016-13 | 894,334 |  |  |
Consumer | Other loans |  |  |  |
Loans |  |  |  |
Total loans | 17,993 | 13,892 |  |
Non-acquired loans |  |  |  |
Loans |  |  |  |
Total loans |  | 9,252,831 | 7,933,286 |
Total loans - ASU 2016-13 | $ 12,289,456 | 9,252,831 |  |
Non-acquired loans | Pass |  |  |  |
Loans |  |  |  |
Total loans |  | 9,123,097 |  |
Non-acquired loans | Special mention |  |  |  |
Loans |  |  |  |
Total loans |  | 83,830 |  |
Non-acquired loans | Substandard |  |  |  |
Loans |  |  |  |
Total loans |  | 45,904 |  |
Non-acquired loans | Construction and land development |  |  |  |
Loans |  |  |  |
Total loans |  | 968,360 | 841,445 |
Non-acquired loans | Commercial non-owner occupied |  |  |  |
Loans |  |  |  |
Total loans |  | 1,811,138 | 1,415,551 |
Non-acquired loans | Commercial owner occupied real estate loan |  |  |  |
Loans |  |  |  |
Total loans |  | 1,784,017 | 1,517,551 |
Non-acquired loans | Commercial and industrial |  |  |  |
Loans |  |  |  |
Total loans |  | 1,280,859 | 1,054,952 |
Non-acquired loans | Other income producing property |  |  |  |
Loans |  |  |  |
Total loans |  | 218,617 | 214,353 |
Total loans - ASU 2016-13 |  | 218,617 |  |
Non-acquired loans | Consumer Owner Occupied Loans |  |  |  |
Loans |  |  |  |
Total loans |  | 2,118,839 | 1,936,265 |
Non-acquired loans | Home equity loans |  |  |  |
Loans |  |  |  |
Total loans |  | 518,628 | 495,148 |
Non-acquired loans | Consumer |  |  |  |
Loans |  |  |  |
Total loans |  | 538,481 | 448,664 |
Non-acquired loans | Other loans |  |  |  |
Loans |  |  |  |
Total loans |  | 13,892 | $ 9,357 |
Non-acquired loans | Commercial loans |  |  |  |
Loans |  |  |  |
Total loans |  | 6,062,991 |  |
Total loans - ASU 2016-13 |  | 1,280,859 |  |
Non-acquired loans | Commercial loans | Pass |  |  |  |
Loans |  |  |  |
Total loans |  | 5,971,069 |  |
Non-acquired loans | Commercial loans | Special mention |  |  |  |
Loans |  |  |  |
Total loans |  | 69,268 |  |
Non-acquired loans | Commercial loans | Substandard |  |  |  |
Loans |  |  |  |
Total loans |  | 22,654 |  |
Non-acquired loans | Commercial loans | Construction and land development |  |  |  |
Loans |  |  |  |
Total loans |  | 968,360 |  |
Total loans - ASU 2016-13 |  | 968,360 |  |
Non-acquired loans | Commercial loans | Construction and land development | Pass |  |  |  |
Loans |  |  |  |
Total loans |  | 959,206 |  |
Non-acquired loans | Commercial loans | Construction and land development | Special mention |  |  |  |
Loans |  |  |  |
Total loans |  | 7,095 |  |
Non-acquired loans | Commercial loans | Construction and land development | Substandard |  |  |  |
Loans |  |  |  |
Total loans |  | 2,059 |  |
Non-acquired loans | Commercial loans | Commercial non-owner occupied |  |  |  |
Loans |  |  |  |
Total loans |  | 1,811,138 |  |
Total loans - ASU 2016-13 |  | 1,811,138 |  |
Non-acquired loans | Commercial loans | Commercial non-owner occupied | Pass |  |  |  |
Loans |  |  |  |
Total loans |  | 1,787,306 |  |
Non-acquired loans | Commercial loans | Commercial non-owner occupied | Special mention |  |  |  |
Loans |  |  |  |
Total loans |  | 22,410 |  |
Non-acquired loans | Commercial loans | Commercial non-owner occupied | Substandard |  |  |  |
Loans |  |  |  |
Total loans |  | 1,422 |  |
Non-acquired loans | Commercial loans | Commercial owner occupied real estate loan |  |  |  |
Loans |  |  |  |
Total loans |  | 1,784,017 |  |
Total loans - ASU 2016-13 |  | 1,784,017 |  |
Non-acquired loans | Commercial loans | Commercial owner occupied real estate loan | Pass |  |  |  |
Loans |  |  |  |
Total loans |  | 1,754,801 |  |
Non-acquired loans | Commercial loans | Commercial owner occupied real estate loan | Special mention |  |  |  |
Loans |  |  |  |
Total loans |  | 19,742 |  |
Non-acquired loans | Commercial loans | Commercial owner occupied real estate loan | Substandard |  |  |  |
Loans |  |  |  |
Total loans |  | 9,474 |  |
Non-acquired loans | Commercial loans | Commercial and industrial |  |  |  |
Loans |  |  |  |
Total loans |  | 1,280,859 |  |
Non-acquired loans | Commercial loans | Commercial and industrial | Pass |  |  |  |
Loans |  |  |  |
Total loans |  | 1,256,465 |  |
Non-acquired loans | Commercial loans | Commercial and industrial | Special mention |  |  |  |
Loans |  |  |  |
Total loans |  | 16,055 |  |
Non-acquired loans | Commercial loans | Commercial and industrial | Substandard |  |  |  |
Loans |  |  |  |
Total loans |  | 8,339 |  |
Non-acquired loans | Commercial loans | Other income producing property |  |  |  |
Loans |  |  |  |
Total loans |  | 218,617 |  |
Non-acquired loans | Commercial loans | Other income producing property | Pass |  |  |  |
Loans |  |  |  |
Total loans |  | 213,291 |  |
Non-acquired loans | Commercial loans | Other income producing property | Special mention |  |  |  |
Loans |  |  |  |
Total loans |  | 3,966 |  |
Non-acquired loans | Commercial loans | Other income producing property | Substandard |  |  |  |
Loans |  |  |  |
Total loans |  | 1,360 |  |
Non-acquired loans | Consumer |  |  |  |
Loans |  |  |  |
Total loans |  | 3,189,840 |  |
Non-acquired loans | Consumer | Pass |  |  |  |
Loans |  |  |  |
Total loans |  | 3,152,028 |  |
Non-acquired loans | Consumer | Special mention |  |  |  |
Loans |  |  |  |
Total loans |  | 14,562 |  |
Non-acquired loans | Consumer | Substandard |  |  |  |
Loans |  |  |  |
Total loans |  | 23,250 |  |
Non-acquired loans | Consumer | Consumer Owner Occupied Loans |  |  |  |
Loans |  |  |  |
Total loans |  | 2,118,839 |  |
Total loans - ASU 2016-13 |  | 2,118,839 |  |
Non-acquired loans | Consumer | Consumer Owner Occupied Loans | Pass |  |  |  |
Loans |  |  |  |
Total loans |  | 2,094,080 |  |
Non-acquired loans | Consumer | Consumer Owner Occupied Loans | Special mention |  |  |  |
Loans |  |  |  |
Total loans |  | 9,585 |  |
Non-acquired loans | Consumer | Consumer Owner Occupied Loans | Substandard |  |  |  |
Loans |  |  |  |
Total loans |  | 15,174 |  |
Non-acquired loans | Consumer | Home equity loans |  |  |  |
Loans |  |  |  |
Total loans |  | 518,628 |  |
Total loans - ASU 2016-13 |  | 518,628 |  |
Non-acquired loans | Consumer | Home equity loans | Pass |  |  |  |
Loans |  |  |  |
Total loans |  | 508,054 |  |
Non-acquired loans | Consumer | Home equity loans | Special mention |  |  |  |
Loans |  |  |  |
Total loans |  | 4,490 |  |
Non-acquired loans | Consumer | Home equity loans | Substandard |  |  |  |
Loans |  |  |  |
Total loans |  | 6,084 |  |
Non-acquired loans | Consumer | Consumer |  |  |  |
Loans |  |  |  |
Total loans |  | 538,481 |  |
Total loans - ASU 2016-13 |  | 538,481 |  |
Non-acquired loans | Consumer | Consumer | Pass |  |  |  |
Loans |  |  |  |
Total loans |  | 536,002 |  |
Non-acquired loans | Consumer | Consumer | Special mention |  |  |  |
Loans |  |  |  |
Total loans |  | 487 |  |
Non-acquired loans | Consumer | Consumer | Substandard |  |  |  |
Loans |  |  |  |
Total loans |  | 1,992 |  |
Non-acquired loans | Consumer | Other loans |  |  |  |
Loans |  |  |  |
Total loans |  | 13,892 |  |
Total loans - ASU 2016-13 |  | 13,892 |  |
Non-acquired loans | Consumer | Other loans | Pass |  |  |  |
Loans |  |  |  |
Total loans |  | $ 13,892 |  |

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