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Portfolio Loans - Summary of Recorded Investment by Risk Category of Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | $ 5,314,337
Loans, including unearned loan fees | $ 7,224,935 | 5,314,337
Non-Covered Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 7,241,074 | 5,316,953
Loans, including unearned loan fees |  | 5,224,048
Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 3,100,299 | 2,345,823
Non-Covered Loans | Commercial - investor owned |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 1,589,419 | 1,262,981
Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 1,498,408 | 678,522
Non-Covered Loans | Construction and land development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 546,686 | 449,380
Non-Covered Loans | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | 319,179 | 355,192
Non-Covered Loans | Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total | $ 187,083 | 134,941
Loans, including unearned loan fees |  | 132,150
Pass (1-6) | Non-Covered Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans, including unearned loan fees |  | 4,954,405
Pass (1-6) | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 2,151,084
Pass (1-6) | Non-Covered Loans | Commercial - investor owned |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 1,242,569
Pass (1-6) | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 643,276
Pass (1-6) | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 437,134
Pass (1-6) | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 348,246
Pass (1-6) | Non-Covered Loans | Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans, including unearned loan fees |  | 132,096
Watch (7) | Non-Covered Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans, including unearned loan fees |  | 187,656
Watch (7) | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 124,718
Watch (7) | Non-Covered Loans | Commercial - investor owned |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 17,572
Watch (7) | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 28,773
Watch (7) | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 12,140
Watch (7) | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 4,450
Watch (7) | Non-Covered Loans | Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans, including unearned loan fees |  | 3
Classified (8 & 9) | Non-Covered Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans, including unearned loan fees |  | 81,987
Classified (8 & 9) | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 70,021
Classified (8 & 9) | Non-Covered Loans | Commercial - investor owned |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 2,840
Classified (8 & 9) | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 6,473
Classified (8 & 9) | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 106
Classified (8 & 9) | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total |  | 2,496
Classified (8 & 9) | Non-Covered Loans | Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans, including unearned loan fees |  | $ 51

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