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Derivative Instruments - Additional Information (Details) - USD ($)
6 Months Ended
Sep. 07, 2018
Jun. 30, 2020
Dec. 31, 2019
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]      
Derivatives designated as fair value hedges   $ 0 $ 0
Accumulated other comprehensive loss estimated   267,000  
Collateral amount for counterparty interest rate swap   $ 1,050,000 750,000
2.98% Fixed Rate Plus 155 Basis Points      
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]      
Interest rate being paid by the corporation   4.53%  
Interest Rate Swaps      
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]      
Cash collateral pledged   $ 4,550,000 $ 2,000,000
Unsecured Debt      
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]      
Term of contract 5 years    
Cash flow hedges $ 10,000,000    
Unsecured Debt | LIBOR Plus 155 Basis Points      
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]      
Variable interest rate on subordinate debt   1.86%  
Unsecured Debt | 2.98% Fixed Rate Plus 155 Basis Points      
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]      
Derivative fixed interest rate rate basis   2.98%  
London Interbank Offered Rate (LIBOR) | Unsecured Debt | LIBOR Plus 155 Basis Points      
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]      
Basis spread on variable rate   1.55%  
London Interbank Offered Rate (LIBOR) | Unsecured Debt | 2.98% Fixed Rate Plus 155 Basis Points      
Schedule Of Loans And Allowance For Loan By Class Individually And Collectively Evaluated For Impairment [Line Items]      
Basis spread on variable rate   1.55%