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Allowance for Credit and Loan Losses - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Ending allowance balance attributable to loans:              
Allowance for credit losses on loans $ 56,319 $ 55,090 $ 22,577 $ 17,667 $ 17,956 $ 18,305 $ 17,820
Loans              
Loans acquired with deteriorated credit quality 3,974,046            
Loans              
Loans              
Individually evaluated for impairment       7,347      
Collectively evaluated for impairment       3,627,249      
Loans acquired with deteriorated credit quality       0      
Total ending loans balance       3,634,596      
Allowance For Loan Losses              
Ending allowance balance attributable to loans:              
Individually evaluated for impairment       541      
Collectively evaluated for impairment       17,126      
Allowance for credit losses on loans       17,667      
Mortgage warehouse | Loans              
Loans              
Individually evaluated for impairment       0      
Collectively evaluated for impairment       150,293      
Loans acquired with deteriorated credit quality       0      
Total ending loans balance       150,293      
Mortgage warehouse | Allowance For Loan Losses              
Ending allowance balance attributable to loans:              
Individually evaluated for impairment       0      
Collectively evaluated for impairment       1,077      
Allowance for credit losses on loans       1,077      
Commercial              
Ending allowance balance attributable to loans:              
Allowance for credit losses on loans 39,795 39,147   11,996 12,082 11,881 10,495
Commercial | Loans              
Loans              
Individually evaluated for impairment       7,347      
Collectively evaluated for impairment       2,040,299      
Loans acquired with deteriorated credit quality       0      
Total ending loans balance       2,047,646      
Commercial | Allowance For Loan Losses              
Ending allowance balance attributable to loans:              
Individually evaluated for impairment       541      
Collectively evaluated for impairment       11,455      
Allowance for credit losses on loans       11,996      
Real estate              
Ending allowance balance attributable to loans:              
Allowance for credit losses on loans 5,464 5,832   923 1,449 1,732 1,676
Real estate | Loans              
Loans              
Individually evaluated for impairment       0      
Collectively evaluated for impairment       770,705      
Loans acquired with deteriorated credit quality       0      
Total ending loans balance       770,705      
Real estate | Allowance For Loan Losses              
Ending allowance balance attributable to loans:              
Individually evaluated for impairment       0      
Collectively evaluated for impairment       923      
Allowance for credit losses on loans       923      
Consumer              
Ending allowance balance attributable to loans:              
Allowance for credit losses on loans $ 9,810 $ 8,921   3,671 $ 3,384 $ 3,652 $ 4,643
Consumer | Loans              
Loans              
Individually evaluated for impairment       0      
Collectively evaluated for impairment       665,952      
Loans acquired with deteriorated credit quality       0      
Total ending loans balance       665,952      
Consumer | Allowance For Loan Losses              
Ending allowance balance attributable to loans:              
Individually evaluated for impairment       0      
Collectively evaluated for impairment       3,671      
Allowance for credit losses on loans       $ 3,671