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Portfolio Loans - Summary of Portfolio Loans by Category (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees |  | $ 5,314,337
Non-Covered Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | $ 7,241,074 | 5,316,953
Unearned loan fees, net | (16,139) | (2,616)
Loans, including unearned loan fees | 7,224,935 | 5,314,337
Non-Covered Loans | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 3,100,299 | 2,345,823
Non-Covered Loans | Commercial - investor owned |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 1,589,419 | 1,262,981
Non-Covered Loans | CRE - owner occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 1,498,408 | 678,522
Non-Covered Loans | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 546,686 | 449,380
Non-Covered Loans | Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 319,179 | 355,192
Non-Covered Loans | Total real estate loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 3,953,692 | 2,820,855
Non-Covered Loans | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | $ 187,083 | 134,941
Non-Covered Loans | Residential Real Estate Financing Receivable, Including Loans Previously Reported as PCI |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees |  | 366,261
Non-Covered Loans | Construction and Land Development Financing Receivable, Including Loans Previously Reported as PCI |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees |  | 457,273
Non-Covered Loans | Commercial Real Estate Owner Occupied Financing Receivable, Including Loans Previously Reported as PCI |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees |  | 697,437
Non-Covered Loans | Commercial Real Estate Investor Owned Financing Receivable, Including Loans Previously Reported as PCI |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees |  | 1,299,884
Non-Covered Loans | Commercial and Industrial Portfolio Segment, Including Loans Previously Reported as PCI |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees |  | $ 2,361,157

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