Other assets - Components of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Other real estate owned		$ 121
Mortgage servicing rights	$ 870	914
Prepaid shares tax	949	48
Prepaid pension	3,764	2,314
Prepaid expenses	4,840	3,038
Restricted equity securities (FHLB and other)	5,180	9,630
Investment in low income housing partnership	5,015	5,446
Interest rate floor and swaps	19,833	22,196
Other assets	2,353	2,765
Total	42,249	46,071
Interest rate swaps
Interest rate floor and swaps	$ 19,278	21,794
Interest rate floor
Interest rate floor and swaps		$ 1