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Portfolio Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 9,017,642 | $ 7,224,935
Non-Covered Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 9,026,780 | 7,241,074
Financing Receivable, Covered, after Allowance for Credit Loss | 9,017,642 | 7,224,935
Non-Covered Loans | Financial Asset, 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 41,639 | 13,529
Non-Covered Loans | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 15,763 | 29,044
Non-Covered Loans | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 57,402 | 42,573
Non-Covered Loans | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 8,960,240 | 7,182,362
Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,396,590 | 3,100,299
Financing Receivable, Covered, after Allowance for Credit Loss | 3,392,375 | 3,088,995
Non-Covered Loans | Commercial and industrial | Financial Asset, 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 24,447 | 8,652
Non-Covered Loans | Commercial and industrial | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 14,158 | 12,928
Non-Covered Loans | Commercial and industrial | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 38,605 | 21,580
Non-Covered Loans | Commercial and industrial | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,353,770 | 3,067,415
Non-Covered Loans | Commercial - investor owned |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,141,143 | 1,589,419
Financing Receivable, Covered, after Allowance for Credit Loss | 2,141,143 | 1,589,419
Non-Covered Loans | Commercial - investor owned | Financial Asset, 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,880 | 734
Non-Covered Loans | Commercial - investor owned | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 9,301
Non-Covered Loans | Commercial - investor owned | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,880 | 10,035
Non-Covered Loans | Commercial - investor owned | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,137,263 | 1,579,384
Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,035,785 | 1,498,408
Financing Receivable, Covered, after Allowance for Credit Loss | 2,035,785 | 1,498,408
Non-Covered Loans | CRE - owner occupied | Financial Asset, 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 10,070 | 328
Non-Covered Loans | CRE - owner occupied | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 289 | 4,647
Non-Covered Loans | CRE - owner occupied | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 10,359 | 4,975
Non-Covered Loans | CRE - owner occupied | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,025,426 | 1,493,433
Non-Covered Loans | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 734,073 | 546,686
Financing Receivable, Covered, after Allowance for Credit Loss | 734,073 | 546,686
Non-Covered Loans | Construction and land development | Financial Asset, 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 24 | 13
Non-Covered Loans | Construction and land development | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 0 | 0
Non-Covered Loans | Construction and land development | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 24 | 13
Non-Covered Loans | Construction and land development | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 734,049 | 546,673
Non-Covered Loans | Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 454,052 | 319,179
Financing Receivable, Covered, after Allowance for Credit Loss | 454,052 | 319,179
Non-Covered Loans | Residential real estate | Financial Asset, 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,181 | 2,071
Non-Covered Loans | Residential real estate | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,305 | 2,118
Non-Covered Loans | Residential real estate | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,486 | 4,189
Non-Covered Loans | Residential real estate | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 449,566 | 314,990
Non-Covered Loans | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 265,137 | 187,083
Financing Receivable, Covered, after Allowance for Credit Loss | 260,214 | 182,248
Non-Covered Loans | Other | Financial Asset, 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 37 | 1,731
Non-Covered Loans | Other | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 11 | 50
Non-Covered Loans | Other | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 48 | 1,781
Non-Covered Loans | Other | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 260,166 | $ 180,467

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