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Allowance for Credit Losses and Credit Quality of Loans, Amortized Cost Basis of Loans Modified to Borrowers Experiencing Financial Difficulty (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Interest Rate Reduction [Member]    
Modified Loans Disaggregated by Class of Financing Receivable and Type of Concession Granted [Abstract]    
Amortized cost $ 31 $ 31
Term Extension [Member]    
Modified Loans Disaggregated by Class of Financing Receivable and Type of Concession Granted [Abstract]    
Amortized cost 145 386
Combination - Term Extension and Interest Rate Reduction [Member]    
Modified Loans Disaggregated by Class of Financing Receivable and Type of Concession Granted [Abstract]    
Amortized cost 0 165
Residential [Member] | Interest Rate Reduction [Member]    
Modified Loans Disaggregated by Class of Financing Receivable and Type of Concession Granted [Abstract]    
Amortized cost $ 31 $ 31
% of total class of financing receivables 0.001% 0.001%
Residential [Member] | Term Extension [Member]    
Modified Loans Disaggregated by Class of Financing Receivable and Type of Concession Granted [Abstract]    
Amortized cost $ 145 $ 386
% of total class of financing receivables 0.006% 0.015%
Residential [Member] | Combination - Term Extension and Interest Rate Reduction [Member]    
Modified Loans Disaggregated by Class of Financing Receivable and Type of Concession Granted [Abstract]    
Amortized cost $ 0 $ 165
% of total class of financing receivables 0.00% 0.006%