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Loans and allowance for loan losses - Additional Information (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2022
loan
Dec. 31, 2021
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan amount   $ 524,707,000     $ 522,601,000
Loans pledged as collateral   37,009,000     $ 35,510,000
Defaults on TDRs that were modified as TDRs | loan       0 0
Provision for (recovery of) loan losses $ (500,000) (400,000) $ (500,000)    
Loans and leases receivable, allowance   $ 3,423,000     $ 3,423,000
Guaranteed student loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Percentage Of Recovery Loss On Portfolio From Historical Experience   98.00%      
Unallocated Financing Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and leases receivable, allowance $ 528,000 $ 195,000 $ 528,000   422,000
PPP Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan amount   $ 1,069,000     $ 32,601,000