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Other comprehensive income (loss) - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Other comprehensive income (loss)    
Net unrealized loss on investment securities available-for-sale $ (55,495) $ (66,250)
Income tax benefit (11,950) (14,266)
Net of income taxes (43,545) (51,984)
Benefit plan adjustments (5,499) (5,499)
Income tax benefit 1,184 1,184
Net of income taxes (4,315) (4,315)
Derivative adjustments (2,017) (47)
Income tax (benefit) expense (434) (10)
Net of income taxes (1,583) (37)
Accumulated other comprehensive loss $ (49,442) $ (56,336)