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Portfolio Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Balance December 31, 2020          
Total     $ 43,288    
Loans - Ending balance:          
    Loans, including unearned loan fees $ 7,224,935   5,314,337    
Total     5,314,337    
Non-Covered Loans          
Balance December 31, 2020          
Total 136,671 $ 69,995 42,567 $ 42,295 $ 38,166
Loans - Ending balance:          
    Loans, including unearned loan fees     5,224,048    
Total 7,241,074   5,316,953    
Non-Covered Loans | Commercial and industrial          
Balance December 31, 2020          
Total 58,812 33,949 27,296 29,039 26,406
Loans - Ending balance:          
Total 3,100,299   2,345,823    
Non-Covered Loans | Commercial - investor owned          
Balance December 31, 2020          
Total 32,062 16,656 5,935 4,683 3,890
Loans - Ending balance:          
Total 1,589,419   1,262,981    
Non-Covered Loans | CRE - owner occupied          
Balance December 31, 2020          
Total 17,012 7,414 4,873 4,239 3,308
Loans - Ending balance:          
Total 1,498,408   678,522    
Non-Covered Loans | Construction and land development          
Balance December 31, 2020          
Total 21,413 7,577 2,472 1,987 1,487
Loans - Ending balance:          
Total 546,686   449,380    
Non-Covered Loans | Residential real estate          
Balance December 31, 2020          
Total 4,585 3,349 1,280 1,616 2,237
Loans - Ending balance:          
Total 319,179   355,192    
Non-Covered Loans | Other          
Balance December 31, 2020          
Total 2,787 $ 1,050 711 $ 731 $ 838
Loans - Ending balance:          
    Loans, including unearned loan fees     132,150    
Total $ 187,083   $ 134,941