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Investment securities available for sale - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
item
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
item
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Schedule of Available-for-sale Securities [Line Items]          
Proceeds from Sale of Available-for-sale Securities, Debt $ 0 $ 0 $ 0 $ 0  
Number of positions, less than 12 months | item 47   47    
Number of positions, more than 12 months | item 24   24    
Securities in a loss position for more than 12 Months, Fair Value $ 57,528,000   $ 57,528,000   $ 4,988,000
Securities in a loss Position for more than 12 Months, Unrealized Losses 8,223,000   8,223,000   195,000
Securities in a loss position for less than 12 Months, Fair Value 71,859,000   71,859,000   64,655,000
Securities in a loss position for less than 12 Months, Unrealized Losses 6,443,000   6,443,000   1,126,000
Investment Pledged As Security For Debt [Member] | FHLB advances          
Schedule of Available-for-sale Securities [Line Items]          
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank $ 0   $ 0   $ 0