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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
Mar. 31, 2021
USD ($)
loan
Mar. 31, 2020
USD ($)
loan
Dec. 31, 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      
Financing Receivable, Troubled Debt Restructuring, Postmodification   $ 3,886      
Financing Receivable, Troubled Debt Restructuring, Premodification   3,886      
Total $ 131,527 92,187 $ 136,671 $ 69,995 $ 43,288
Loans - Ending balance:          
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums (20,124)   (16,139)    
Total $ 7,308,905   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 1        
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 3,731        
Financing Receivable, Troubled Debt Restructuring, Premodification 3,731        
Total 55,941 45,981 58,812 33,949 27,455
Loans - Ending balance:          
Total 3,096,319   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 33,105 19,892 32,062 16,656 5,935
Loans - Ending balance:          
Total 1,669,215   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 20,219 9,477 17,012 7,414 4,873
Loans - Ending balance:          
Total 1,517,755   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 14,557 $ 9,895 21,413 7,577 2,611
Loans - Ending balance:          
Total 510,501   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   2      
Financing Receivable, Troubled Debt Restructuring, Postmodification   $ 155      
Financing Receivable, Troubled Debt Restructuring, Premodification   155      
Total 4,305 5,395 4,585 3,349 1,280
Loans - Ending balance:          
Total 303,047   319,179    
Other          
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]          
Total 3,400 $ 1,547 2,787 $ 1,050 $ 1,134
Loans - Ending balance:          
Total $ 212,068   $ 187,083