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Loans and allowance for loan losses - Additional Information (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
loan
Sep. 30, 2021
USD ($)
loan
Dec. 31, 2021
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loan amount $ 537,905,000 $ 537,905,000   $ 537,905,000   $ 522,601,000
Defaults on TDRs that were modified as TDRs | loan       0 0  
Recovery of loan losses 100,000 (300,000) $ (500,000)      
Loans and leases receivable, allowance 3,370,000 3,370,000   $ 3,370,000   3,423,000
Asset Pledged as Collateral [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans pledged as collateral $ 35,822,000 $ 35,822,000   $ 35,822,000   35,510,000
Guaranteed student loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Percentage Of Recovery Loss On Portfolio From Historical Experience 98.00% 98.00%   98.00%    
Unallocated Financing Receivable [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and leases receivable, allowance $ 45,000 $ 45,000 $ 355,000 $ 45,000 $ 355,000 422,000
PPP Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loan amount $ 710,000 $ 710,000   $ 710,000   $ 32,601,000