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Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - Non-Covered Loans - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | $ 45,881 | $ 42,573
Current | 9,070,702 | 7,182,362
Loans, including unearned loan fees | 9,116,583 | 7,224,935
Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 29,222 | 21,580
Current | 3,349,949 | 3,067,415
Loans, including unearned loan fees | 3,379,171 | 3,088,995
CRE - investor owned |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 298 | 10,035
Current | 2,120,953 | 1,579,384
Loans, including unearned loan fees | 2,121,251 | 1,589,419
CRE - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 14,460 | 4,975
Current | 2,044,000 | 1,493,433
Loans, including unearned loan fees | 2,058,460 | 1,498,408
Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 169 | 13
Current | 747,590 | 546,673
Loans, including unearned loan fees | 747,759 | 546,686
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,447 | 4,189
Current | 541,243 | 314,990
Loans, including unearned loan fees | 542,690 | 319,179
Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 285 | 1,781
Current | 266,967 | 180,467
Loans, including unearned loan fees | 267,252 | 182,248
Financial Asset, 30 to 89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 28,249 | 13,529
Financial Asset, 30 to 89 Days Past Due [Member] | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 17,470 | 8,652
Financial Asset, 30 to 89 Days Past Due [Member] | CRE - investor owned |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 298 | 734
Financial Asset, 30 to 89 Days Past Due [Member] | CRE - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 9,900 | 328
Financial Asset, 30 to 89 Days Past Due [Member] | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 169 | 13
Financial Asset, 30 to 89 Days Past Due [Member] | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 138 | 2,071
Financial Asset, 30 to 89 Days Past Due [Member] | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 274 | 1,731
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 17,632 | 29,044
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 11,752 | 12,928
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | CRE - investor owned |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 9,301
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | CRE - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,560 | 4,647
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,309 | 2,118
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | $ 11 | $ 50

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