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Portfolio Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Balance December 31, 2020 |  |  |  |  |
Total |  |  | $ 43,288 |  |
Loans - Ending balance: |  |  |  |  |
Loans, including unearned loan fees | $ 7,224,935 |  | 5,314,337 |  |
Total |  |  | 5,314,337 |  |
Non-Covered Loans |  |  |  |  |
Balance December 31, 2020 |  |  |  |  |
Total | 136,671 | $ 69,995 | 42,567 | $ 42,295 | $ 38,166
Loans - Ending balance: |  |  |  |  |
Loans, including unearned loan fees |  |  | 5,224,048 |  |
Total | 7,241,074 |  | 5,316,953 |  |
Non-Covered Loans | Commercial and industrial |  |  |  |  |
Balance December 31, 2020 |  |  |  |  |
Total | 58,812 | 33,949 | 27,296 | 29,039 | 26,406
Loans - Ending balance: |  |  |  |  |
Total | 3,100,299 |  | 2,345,823 |  |
Non-Covered Loans | Commercial - investor owned |  |  |  |  |
Balance December 31, 2020 |  |  |  |  |
Total | 32,062 | 16,656 | 5,935 | 4,683 | 3,890
Loans - Ending balance: |  |  |  |  |
Total | 1,589,419 |  | 1,262,981 |  |
Non-Covered Loans | CRE - owner occupied |  |  |  |  |
Balance December 31, 2020 |  |  |  |  |
Total | 17,012 | 7,414 | 4,873 | 4,239 | 3,308
Loans - Ending balance: |  |  |  |  |
Total | 1,498,408 |  | 678,522 |  |
Non-Covered Loans | Construction and land development |  |  |  |  |
Balance December 31, 2020 |  |  |  |  |
Total | 21,413 | 7,577 | 2,472 | 1,987 | 1,487
Loans - Ending balance: |  |  |  |  |
Total | 546,686 |  | 449,380 |  |
Non-Covered Loans | Residential real estate |  |  |  |  |
Balance December 31, 2020 |  |  |  |  |
Total | 4,585 | 3,349 | 1,280 | 1,616 | 2,237
Loans - Ending balance: |  |  |  |  |
Total | 319,179 |  | 355,192 |  |
Non-Covered Loans | Other |  |  |  |  |
Balance December 31, 2020 |  |  |  |  |
Total | 2,787 | $ 1,050 | 711 | $ 731 | $ 838
Loans - Ending balance: |  |  |  |  |
Loans, including unearned loan fees |  |  | 132,150 |  |
Total | $ 187,083 |  | $ 134,941 |  |

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