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Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) - Portfolio loans, net $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) loan | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) loan | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($)
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | loan |  | 3 |  | 6 |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification |  | $ 3,933 |  | $ 7,819 |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 3,933 |  | 7,819 |  |  |  |  |
Total | $ 152,096 | $ 123,270 | $ 152,096 | $ 123,270 | $ 128,185 | $ 136,671 | $ 110,270 | $ 69,995 | $ 43,288
Loans - Ending balance: |  |  |  |  |  |  |  |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | (10,213) |  | (10,213) |  |  | (16,139) |  |  |
Total | 9,126,796 |  | 9,126,796 |  |  | 7,241,074 |  |  |
Commercial and industrial |  |  |  |  |  |  |  |  |
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | loan |  | 2 |  | 3 |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | 200 | $ 3,716 | 200 | $ 7,447 |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 3,716 |  | 7,447 |  |  |  |  |
Total | 61,887 | 57,870 | 61,887 | 57,870 | 53,351 | 58,812 | 50,139 | 33,949 | 27,455
Loans - Ending balance: |  |  |  |  |  |  |  |  |
Total | 3,386,599 |  | 3,386,599 |  |  | 3,100,299 |  |  |
CRE - investor owned |  |  |  |  |  |  |  |  |
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items] |  |  |  |  |  |  |  |  |
Total | 42,635 | 29,671 | 42,635 | 29,671 | 36,003 | 32,062 | 25,019 | 16,656 | 5,935
Loans - Ending balance: |  |  |  |  |  |  |  |  |
Total | 2,121,251 |  | 2,121,251 |  |  | 1,589,419 |  |  |
CRE - owner occupied |  |  |  |  |  |  |  |  |
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items] |  |  |  |  |  |  |  |  |
Total | 18,733 | 9,472 | 18,733 | 9,472 | 15,564 | 17,012 | 11,088 | 7,414 | 4,873
Loans - Ending balance: |  |  |  |  |  |  |  |  |
Total | 2,058,460 |  | 2,058,460 |  |  | 1,498,408 |  |  |
Construction and land development |  |  |  |  |  |  |  |  |
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items] |  |  |  |  |  |  |  |  |
Total | 14,052 | $ 18,918 | 14,052 | $ 18,918 | 11,632 | 21,413 | 15,962 | 7,577 | 2,611
Loans - Ending balance: |  |  |  |  |  |  |  |  |
Total | 747,759 |  | 747,759 |  |  | 546,686 |  |  |
Residential real estate |  |  |  |  |  |  |  |  |
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | loan |  | 1 |  | 3 |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification |  | $ 217 |  | $ 372 |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 217 |  | 372 |  |  |  |  |
Total | 9,223 | 5,331 | 9,223 | 5,331 | 4,677 | 4,585 | 6,333 | 3,349 | 1,280
Loans - Ending balance: |  |  |  |  |  |  |  |  |
Total | 542,690 |  | 542,690 |  |  | 319,179 |  |  |
Other |  |  |  |  |  |  |  |  |
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items] |  |  |  |  |  |  |  |  |
Total | 5,566 | $ 2,008 | 5,566 | $ 2,008 | $ 6,958 | 2,787 | $ 1,729 | $ 1,050 | $ 1,134
Loans - Ending balance: |  |  |  |  |  |  |  |  |
Total | $ 270,037 |  | $ 270,037 |  |  | $ 187,083 |  |  |

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