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Loans - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
application
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
loan
application
Contract
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Period for order of valuations (at least)     18 months    
Troubled debt restructured loans, balance $ 3,722,000 $ 3,892,000 $ 3,722,000 $ 3,892,000  
Number of loans which has periodic late payments | Contract     1    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts with Active Forbearance Agreements     0    
Consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process 527,000   $ 527,000   $ 391,000
Recognized loan fee income $ 18,948,000 20,180,000 $ 36,746,000 39,215,000  
Residential mortgage and commercial loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Threshold period past due to discontinue accrual interest on financing receivable     90 days    
Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Threshold period past due for write-off of financing receivable (no later than) 120 days   120 days    
Commercial real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Period of financing receivable, updated valuation on real estate secured loans (number of days past due)     90 days    
Number of previous months with no updated valuation completed for corporation to update valuation     12 months    
Impaired financing receivable, valuation on real estate collateralized loans (number of days after the loan is classified as impaired)     30 days    
CARES Act          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Troubled debt restructured loans, balance $ 17,431,231   $ 17,431,231    
Number of loans with temporary modifications | loan     8    
Number of applications | application 2,217   2,217    
Total amount under PPP (up to) $ 223,036,703   $ 223,036,703    
Projected fee income     9,500,000    
Recognized loan fee income 2,178,000   $ 3,130,000 677,000  
Maximum | Commercial real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable term     20 years    
Loan-to-value ratio (no greater than)     80.00%    
Maximum | Residential mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable term     30 years    
Loan-to-value ratio (no greater than)     80.00%    
Loan-to-value ratio that requires private mortgage insurance (in excess of)     80.00%    
Maximum | Home equity lines of credit          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable term     20 years    
Loan-to-value ratio (no greater than)     90.00%    
Nonaccrual          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Troubled debt restructured loans, balance 95,000 159,000 $ 95,000 159,000  
Accrual          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Troubled debt restructured loans, balance $ 3,627,000 $ 3,733,000 $ 3,627,000 $ 3,733,000