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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