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Loans - Additional Information (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
payment
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
payment
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Paycheck protection program $ 92,300,000   $ 92,300,000   $ 208,900,000
Deferred loan costs 316,000   $ 316,000   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 $ 0 $ 0  
Non–accrual 25,137,000   25,137,000   22,142,000
Non-performing TDRs 1,600,000   1,600,000   2,600,000
Non–performing TDRs $ 1,604,000   $ 1,604,000   2,610,000
Restructured loan returned to accruing status number of Consecutive Payments of loan | payment 6   6    
Restructured loan reported in TDRs $ 4,037,000   $ 4,037,000   4,403,000
Specific reserves allocated to troubled debt restructuring 0   0    
Maximum          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans with an aggregate credit exposure 6,000,000   $ 6,000,000    
Loans classified as TDR after a period (in days)     120 days    
Maximum | Satisfactory Pass          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Minimum number of years of Satisfactory Repayment required for Satisfactory Pass Rating (in years)     2 years    
Minimum          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Loans with an aggregate credit exposure 3,000,000   $ 3,000,000    
Loans classified as TDR after a period (in days)     90 days    
Minimum | Good Pass          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Number of consecutive years of profit for Good Pass Rating (in years)     3 years    
Number of consecutive years of profit Unaudited Financial Information for Good Pass Rating (in years)     5 years    
Number of years of Satisfactory Relationship with bank for Good Pass Rating (in years)     5 years    
CARES Act          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Restructured loan reported in TDRs 29,200,000   $ 29,200,000   $ 126,700,000
Performing          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Restructured loan reported in TDRs 2,400,000   2,400,000    
Number TDRs returned to accrual status     603,000    
Loans Purchased With Evidence of Credit Deterioration          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Non–accrual 2,200,000   2,200,000    
Non-performing TDRs $ 295,000   $ 295,000