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Loans - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
application
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
application
forbearanceAgreement
Contract
Jun. 30, 2021
USD ($)
Dec. 31, 2021
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 $ 3,517,000 $ 3,722,000 $ 3,517,000 $ 3,722,000    
Number of loans which has periodic late payments | Contract     1      
Number of contracts with active forbearance agreements | forbearanceAgreement     0      
Consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process 696,000   $ 696,000   $ 399,000  
Recognized loan fee income $ 16,770,000 18,948,000 $ 32,860,000 36,746,000    
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]            
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 482,000   950,000   $ 5,627,000 $ 2,875,000
PPP loans 242,000   $ 242,000      
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 0 95,000 $ 0 95,000    
Accrual            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Troubled debt restructured loans, balance $ 3,517,000 $ 3,627,000 $ 3,517,000 $ 3,627,000