Investment securities available for sale - Additional Information (Details)	12 Months Ended
Dec. 31, 2021 USD ($) position	Dec. 31, 2020 USD ($) position
Schedule of Available-for-sale Securities [Line Items]
Proceeds from Sale of Available-for-sale Securities, Debt	$ 0	$ 7,936,000
Available-for-sale Securities, Gross Realized Gain (Loss)	$ 0	$ 12,000
Number of positions, more than 12 months \| position	5	5
Securities in a loss position for more than 12 Months, Fair Value	$ 4,988,000	$ 2,807,000
Securities in a loss Position for more than 12 Months, Unrealized Losses	195,000	125,000
Securities in a loss position for less than 12 Months, Fair Value	64,655,000	7,222,000
Securities in a loss position for less than 12 Months, Unrealized Losses	1,126,000	62,000
Available-for-sale Securities, Gross Unrealized Loss	195,000	125,000
Investment Pledged As Security For Debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank	$ 0	$ 0

Amount of unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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