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Loans - Summary of Portfolio Loans Individually Evaluated for Impairment by Category (Details) - Portfolio loans, net - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]                  
Nonaccrual loans with no allowance $ 15,067   $ 15,067            
Total nonperforming loans 42,252   42,252     $ 38,507      
Financing Receivable, Allowance for Credit Loss, Writeoff (1,832) $ (3,664) (8,306) $ (3,968)          
Financing Receivable, Allowance for Credit Loss, Recovery 963 3,356 1,790 4,157          
Financing receivable, allowance for credit loss 128,185 110,270 128,185 110,270 $ 131,527 136,671 $ 92,187 $ 69,995 $ 43,288
Commercial and industrial                  
Financing Receivable, Impaired [Line Items]                  
Nonaccrual loans with no allowance 10,215   10,215     8,316      
Total nonperforming loans 24,844   24,844     21,770      
Financing Receivable, Allowance for Credit Loss, Writeoff (1,451) (3,303) (5,190) (3,366)          
Financing Receivable, Allowance for Credit Loss, Recovery 700 293 1,027 797          
Financing receivable, allowance for credit loss 53,351 50,139 53,351 50,139 55,941 58,812 45,981 33,949 27,455
Commercial - investor owned                  
Financing Receivable, Impaired [Line Items]                  
Nonaccrual loans with no allowance 441   441     716      
Total nonperforming loans 7,359   7,359     9,579      
Financing Receivable, Allowance for Credit Loss, Writeoff 0 (224) (2,372) (226)          
Financing Receivable, Allowance for Credit Loss, Recovery 39 2,752 73 2,766          
Financing receivable, allowance for credit loss 36,003 25,019 36,003 25,019 33,105 32,062 19,892 16,656 5,935
Commercial - owner occupied                  
Financing Receivable, Impaired [Line Items]                  
Nonaccrual loans with no allowance 1,616   1,616     6,024      
Total nonperforming loans 5,885   5,885     2,940      
Financing Receivable, Allowance for Credit Loss, Writeoff (216) 0 (244) 0          
Financing Receivable, Allowance for Credit Loss, Recovery 10 11 19 80          
Financing receivable, allowance for credit loss 15,564 11,088 15,564 11,088 20,219 17,012 9,477 7,414 4,873
Construction and land development                  
Financing Receivable, Impaired [Line Items]                  
Nonaccrual loans with no allowance 100   100     0      
Total nonperforming loans 100   100            
Financing Receivable, Allowance for Credit Loss, Writeoff 0 0 0 (31)          
Financing Receivable, Allowance for Credit Loss, Recovery 32 29 267 69          
Financing receivable, allowance for credit loss 11,632 15,962 11,632 15,962 14,557 21,413 9,895 7,577 2,611
Residential real estate                  
Financing Receivable, Impaired [Line Items]                  
Nonaccrual loans with no allowance 2,695   2,695     3,190      
Total nonperforming loans 4,038   4,038     4,189      
Financing Receivable, Allowance for Credit Loss, Writeoff (44) (32) (315) (154)          
Financing Receivable, Allowance for Credit Loss, Recovery 161 226 304 383          
Financing receivable, allowance for credit loss 4,677 6,333 4,677 6,333 4,305 4,585 5,395 3,349 1,280
Other                  
Financing Receivable, Impaired [Line Items]                  
Nonaccrual loans with no allowance 0   0     18,246      
Total nonperforming loans 26   26     29      
Financing Receivable, Allowance for Credit Loss, Writeoff (121) (105) (185) (191)          
Financing Receivable, Allowance for Credit Loss, Recovery 21 45 100 62          
Financing receivable, allowance for credit loss $ 6,958 $ 1,729 $ 6,958 $ 1,729 $ 3,400 $ 2,787 $ 1,547 $ 1,050 $ 1,134