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Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total | $ 10,616,820 | $ 9,737,138
Loans, including unearned loan fees | 92,931 | 78,789
Non-Covered Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 10,622,397 | 9,744,427
Loans, including unearned loan fees | 10,616,820 | 9,737,138
Unearned loan fees, net | (5,577) | (7,289)
Loans, before unearned loan fees, after allowance | 10,622,397 | 9,744,427
Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 4,449,129 | 3,859,964
Loans, including unearned loan fees | 4,449,129 | 3,859,964
Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 2,425,821 | 2,357,820
Loans, including unearned loan fees | 2,425,821 | 2,357,820
Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 2,361,370 | 2,270,551
Loans, including unearned loan fees | 2,361,370 | 2,270,551
Non-Covered Loans | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 723,138 | 611,565
Loans, including unearned loan fees | 723,138 | 611,565
Non-Covered Loans | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 375,986 | 395,537
Loans, including unearned loan fees | 375,986 | 395,537
Non-Covered Loans | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 286,953 | 248,990
Loans, including unearned loan fees | 286,953 | 248,990
Total Past Due | Non-Covered Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, before unearned loan fees | 62,558 | 15,373
Total Past Due | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 23,652 | 2,928
Total Past Due | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 17,224 | 1,135
Total Past Due | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 18,390 | 8,792
Total Past Due | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,737 | 1,201
Total Past Due | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,405 | 1,227
Total Past Due | Non-Covered Loans | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 150 | 90
30-89 Days Past Due | Non-Covered Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, before unearned loan fees | 39,640 | 10,437
30-89 Days Past Due | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 15,723 | 555
30-89 Days Past Due | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 16,287 | 0
30-89 Days Past Due | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 5,338 | 8,628
30-89 Days Past Due | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 1,737 | 9
30-89 Days Past Due | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 446 | 1,227
30-89 Days Past Due | Non-Covered Loans | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 109 | 18
90 or More Days Past Due | Non-Covered Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, before unearned loan fees | 22,918 | 4,936
90 or More Days Past Due | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 7,929 | 2,373
90 or More Days Past Due | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 937 | 1,135
90 or More Days Past Due | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 13,052 | 164
90 or More Days Past Due | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 0 | 1,192
90 or More Days Past Due | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 959 | 0
90 or More Days Past Due | Non-Covered Loans | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 41 | 72
Current | Non-Covered Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans, before unearned loan fees | 10,559,839 | 9,729,054
Current | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 4,425,477 | 3,857,036
Current | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 2,408,597 | 2,356,685
Current | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 2,342,980 | 2,261,759
Current | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 721,401 | 610,364
Current | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total | 374,581 | 394,310
Current | Non-Covered Loans | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total | $ 286,803 | $ 248,900

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