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Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Increase (decrease) in available commitments   $ (993)    
Commercial lines of credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet $ 297,898 330,234 $ 297,898  
Revolving home equity lines        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet 191,969 210,938 191,969  
Undisbursed construction loans        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet 101,307 78,381 101,307  
Personal and other lines of credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet 10,611 11,001 10,611  
Standby letters of credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet 2,657 3,657 2,657  
Total unfunded loan commitments and standby letters of credit        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loan commitments and standby letters of credit, off-balance sheet 604,442 634,211 $ 604,442  
Percentage of commitments expiring in 2021     39.00%  
Percentage of commitments expiring between 2023 and 2029     49.00%  
Percentage of commitments expiring 2029 and thereafter     12.00%  
Allowance for off-balance sheet commitments 2,800 $ 1,800 $ 2,800 $ 610
Increase (decrease) in available commitments 36,900      
Total unfunded loan commitments and standby letters of credit | Cumulative Effect, Period of Adoption, Adjusted Balance        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Allowance for off-balance sheet commitments 1,100   1,100  
Total unfunded loan commitments and standby letters of credit | Cumulative Effect, Period of Adoption, Adjustment        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Allowance for off-balance sheet commitments $ 550   $ 550