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Other comprehensive income - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Other comprehensive income
Net unrealized loss on investment securities available for sale	$ (34,113)	$ (48,959)
Income tax benefit	(7,443)	(10,681)
Net of income taxes	(26,670)	(38,278)
Benefit plan adjustments	(2,852)	(2,852)
Income tax benefit	(622)	(622)
Net of income taxes	(2,230)	(2,230)
Derivative adjustments	(353)	(239)
Income tax benefit	(77)	(52)
Net of income taxes	(276)	(187)
Accumulated other comprehensive loss	$ (29,176)	$ (40,695)

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