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Fair Value of Assets and Liabilities - Additional Information (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Allowance for Credit Losses $ 2,532,000      
Other real estate owned 5,625,000   $ 2,489,000  
Mortgage servicing rights (MSR) impairment (recovery) 115,000      
Mortgage Servicing Rights        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Finite-lived intangible assets, net 455,000 $ 661,000 516,000 $ 1,444,000
Mortgage servicing rights (MSR) impairment (recovery) (474,000) $ 328,000 $ 273,000  
Fair Value, Nonrecurring        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Unpaid Principal Balance 16,035,000      
Recorded Balance 13,682,000      
Allowance for Credit Losses 2,353,000      
Fair Value, Nonrecurring | Mortgage Servicing Rights        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Indefinite-lived contractual rights 570,000      
Finite-lived intangible assets, net 455,000      
Fair Value, Nonrecurring | Carrying Amount        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Other real estate owned 5,625,000      
Fair Value, Nonrecurring | Fair Value        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Other real estate owned $ 1,720,000