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Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Ending allowance balance attributable to loans:        
Allowance for loan losses $ 57,027 $ 17,667 $ 17,820 $ 16,394
Loans:        
Loans (excluding loan level hedges), net $ 3,810,356      
Total ending loans balance   7,351    
Loans        
Loans:        
Individually evaluated for impairment   7,347    
Collectively evaluated for impairment   3,627,249    
Loans (excluding loan level hedges), net   0    
Total ending loans balance   3,634,596    
Mortgage warehouse | Loans        
Loans:        
Individually evaluated for impairment   0    
Collectively evaluated for impairment   150,293    
Loans (excluding loan level hedges), net   0    
Total ending loans balance   150,293    
Allowance For Loan Losses        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment   541    
Collectively evaluated for impairment   17,126    
Loans acquired with deteriorated credit quality   0    
Allowance for loan losses   17,667    
Allowance For Loan Losses | Mortgage warehouse        
Ending allowance balance attributable to loans:        
Individually evaluated for impairment   0    
Collectively evaluated for impairment   1,077    
Loans acquired with deteriorated credit quality   0    
Allowance for loan losses   1,077    
Commercial | Loans        
Loans:        
Individually evaluated for impairment   7,347    
Collectively evaluated for impairment   2,040,299    
Loans (excluding loan level hedges), net   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    
Loans acquired with deteriorated credit quality   0    
Allowance for loan losses   11,996    
Real estate | Loans        
Loans:        
Individually evaluated for impairment   0    
Collectively evaluated for impairment   770,705    
Loans (excluding loan level hedges), net   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    
Loans acquired with deteriorated credit quality   0    
Allowance for loan losses   923    
Consumer | Loans        
Loans:        
Individually evaluated for impairment   0    
Collectively evaluated for impairment   665,952    
Loans (excluding loan level hedges), net   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    
Loans acquired with deteriorated credit quality   0    
Allowance for loan losses   $ 3,671