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Fair Value of Financial Instruments (Assets Measured at Fair Value Nonrecurring) (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Nonrecurring Basis      
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 0    
Valuation Allowance for Impairment of Recognized Servicing Assets, Deductions for Aggregate Write-Downs 16,000 $ 161,000  
Servicing Asset 2,294,000 2,486,000 $ 2,742,000
Nonrecurring Basis | Level 3      
Nonrecurring Basis      
Other Real Estate, Foreclosed Assets, and Repossessed Assets 11,268,000 134,000  
Servicing Asset 2,294,000 2,591,000  
Nonrecurring Basis | Level 1      
Nonrecurring Basis      
Other Real Estate, Foreclosed Assets, and Repossessed Assets 0 0  
Servicing Asset 0 0  
Nonrecurring Basis | Level 2      
Nonrecurring Basis      
Other Real Estate, Foreclosed Assets, and Repossessed Assets 0 0  
Servicing Asset 0 0  
Loans held for sale $ 2,751,000 $ 4,733,000