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Investment securities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Jan. 01, 2023
Summary of significant accounting policies
Net unrealized losses on available-for-sale securities	$ 55,700	$ 52,000
Deferred income taxes on available-for-sale securities	15,300	$ 14,300
Proceeds from sale of available-for-sale investment securities	65,600
Net gain on available-for-sale securities	81
Allowance for credit loss on available-for-sale debt securities	0		$ 0
Allowance for credit loss on held-to-maturity	$ 0		$ 0

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Amount excluding accrued interest, of allowance for credit 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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