Bank segment - Gross Charge by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Credit risk profile by internally assigned grade for loans
Charge offs current fiscal year of origination	$ 166	$ 189
Charge offs one years prior of origination year	937	1,524
Charge offs two years prior of origination year	1,703	413
Charge offs three years prior of origination year	418	57
Charge offs four years prior of origination year	36	184
Charge offs more than five years prior of origination year	415	1,055
Total	3,675	3,422
Consumer
Credit risk profile by internally assigned grade for loans
Charge offs current fiscal year of origination	166	189
Charge offs one years prior of origination year	937	1,524
Charge offs two years prior of origination year	1,342	319
Charge offs three years prior of origination year	127	57
Charge offs four years prior of origination year	36	176
Charge offs more than five years prior of origination year	111	58
Total	2,719	2,323
Commercial
Credit risk profile by internally assigned grade for loans
Charge offs current fiscal year of origination	0	0
Charge offs one years prior of origination year	0	0
Charge offs two years prior of origination year	0	51
Charge offs three years prior of origination year	14	0
Charge offs four years prior of origination year	0	8
Charge offs more than five years prior of origination year	100	168
Total	114	227
Residential 1-4 family
Credit risk profile by internally assigned grade for loans
Charge offs current fiscal year of origination	0	0
Charge offs one years prior of origination year	0	0
Charge offs two years prior of origination year	361	0
Charge offs three years prior of origination year	277	0
Charge offs four years prior of origination year	0	0
Charge offs more than five years prior of origination year	204	809
Total	842	809
Home equity line of credit
Credit risk profile by internally assigned grade for loans
Charge offs current fiscal year of origination	0	0
Charge offs one years prior of origination year	0	0
Charge offs two years prior of origination year	0	43
Charge offs three years prior of origination year	0	0
Charge offs four years prior of origination year	0	0
Charge offs more than five years prior of origination year	0	20
Total	0	63
Residential land
Credit risk profile by internally assigned grade for loans
Charge offs current fiscal year of origination	0	0
Charge offs one years prior of origination year	0	0
Charge offs two years prior of origination year	0	0
Charge offs three years prior of origination year	0	0
Charge offs four years prior of origination year	0	0
Charge offs more than five years prior of origination year	0	0
Total	0	0
Residential construction
Credit risk profile by internally assigned grade for loans
Charge offs current fiscal year of origination	0	0
Charge offs one years prior of origination year	0	0
Charge offs two years prior of origination year	0	0
Charge offs three years prior of origination year	0	0
Charge offs four years prior of origination year	0	0
Charge offs more than five years prior of origination year	0	0
Total	0	0
Commercial real estate
Credit risk profile by internally assigned grade for loans
Charge offs current fiscal year of origination	0	0
Charge offs one years prior of origination year	0	0
Charge offs two years prior of origination year	0	0
Charge offs three years prior of origination year	0	0
Charge offs four years prior of origination year	0	0
Charge offs more than five years prior of origination year	0	0
Total	0	0
Commercial construction
Credit risk profile by internally assigned grade for loans
Charge offs current fiscal year of origination	0	0
Charge offs one years prior of origination year	0	0
Charge offs two years prior of origination year	0	0
Charge offs three years prior of origination year	0	0
Charge offs four years prior of origination year	0	0
Charge offs more than five years prior of origination year	0	0
Total	$ 0	$ 0