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Fair Value of Assets and Liabilities - Additional Information (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Unpaid Principal Balance $ 21,101,000   $ 25,861,000  
Recorded Balance 18,578,000   23,440,000  
Allowance for Credit Losses 1,369,000   1,098,000  
Other real estate owned 2,256,000   3,644,000  
Mortgage servicing rights (MSR) impairment (recovery) 523,000      
Mortgage Servicing Rights        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Finite-lived intangible assets, net 900,000 $ 1,636,000 1,444,000 $ 2,101,000
Mortgage servicing rights (MSR) impairment (recovery) 259,000 $ 439,000 $ 380,000  
Fair Value, Nonrecurring        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Unpaid Principal Balance 9,708,000      
Recorded Balance 8,358,000      
Allowance for Credit Losses 1,350,000      
Fair Value, Nonrecurring | Mortgage Servicing Rights        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Indefinite-lived contractual rights 1,422,000      
Finite-lived intangible assets, net 899,000      
Fair Value, Nonrecurring | Carrying Amount        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Other real estate owned 2,256,000      
Fair Value, Nonrecurring | Fair Value        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Other real estate owned $ 21,000