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Loans - Additional Information (Details)
 3 Months Ended
Mar. 31, 2021
USD ($)
payment
Mar. 31, 2020
USD ($)
loan
Dec. 31, 2020
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Paycheck protection program $ 252,300,000   $ 208,900,000
Deferred loan costs $ (5,000,000.0)   (1,700,000)
Period of loan sold by mortgage company 30 days    
Minimum period seldom held 90 days    
Mortgage warehousing maximum pay off period 30 days    
Nonaccrual interest income $ 0 $ 0  
Non–accrual 20,700,000   22,142,000
Non-performing TDRs 2,300,000   2,600,000
Non–performing TDRs $ 2,271,000   2,610,000
Restructured loan returned to accruing status number of Consecutive Payments of loan | payment 6    
Restructured loan reported in TDRs $ 4,099,000   4,403,000
Specific reserves allocated to troubled debt restructuring 0    
Maximum      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans with an aggregate credit exposure $ 3,500,000    
Loans classified as TDR after a period 120 days    
Maximum | Satisfactory Pass      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Minimum number of years of Satisfactory Repayment required for Satisfactory Pass Rating 2 years    
Minimum      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Loans with an aggregate credit exposure $ 1,000,000    
Loans classified as TDR after a period 90 days    
Minimum | Good Pass      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of consecutive years of profit for Good Pass Rating 3 years    
Number of consecutive years of profit Unaudited Financial Information for Good Pass Rating 5 years    
Number of years of Satisfactory Relationship with bank for Good Pass Rating 5 years    
CARES Act      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Restructured loan reported in TDRs $ 91,600,000   $ 126,700,000
Performing      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Restructured loan reported in TDRs 1,800,000    
Number TDRs returned to accrual status | loan   0  
Loans Purchased With Evidence of Credit Deterioration      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Non–accrual 2,400,000    
Non-performing TDRs $ 907,000