Investment securities available for sale - Additional Information (Details)	3 Months Ended	6 Months Ended
Jun. 30, 2022 USD ($) item	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) item	Jun. 30, 2021 USD ($)	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	53		53
Number of positions, more than 12 months \| item	13		13
Securities in a loss position for more than 12 Months, Fair Value	$ 15,302,000		$ 15,302,000		$ 4,988,000
Securities in a loss Position for more than 12 Months, Unrealized Losses	2,598,000		2,598,000		195,000
Securities in a loss position for less than 12 Months, Fair Value	111,407,000		111,407,000		64,655,000
Securities in a loss position for less than 12 Months, Unrealized Losses	7,426,000		7,426,000		1,126,000
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		$ 0

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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