Available-for-sale securities - By Maturity Date (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
Due Within 5 years	$ 6,932	$ 31,630
Due After 5 years through 10 years	25,127	5,171
Due After 10 years	73,546	59,746
Amortized Cost	105,605	96,547
Fair Value
Due Within 5 years	6,690	30,756
Due After 5 years through 10 years	18,633	5,188
Due After 10 years	59,197	58,397
Total	84,520	94,341
Available-for-sale securities with stated maturity dates
Amortized Cost
Due Within 5 years	6,932	17,754
Due After 5 years through 10 years	19,851	5,171
Due After 10 years	5,342	5,772
Amortized Cost	32,125	28,697
Fair Value
Due Within 5 years	6,690	16,921
Due After 5 years through 10 years	14,504	5,188
Due After 10 years	4,280	5,603
Total	25,474	27,712
Corporate bonds
Amortized Cost
Due Within 5 years	3,778	17,754
Due After 5 years through 10 years	15,995	0
Due After 10 years	0	0
Amortized Cost	19,773	17,754
Fair Value
Due Within 5 years	3,721	16,921
Due After 5 years through 10 years	10,934	0
Due After 10 years	0	0
Total	14,655	16,921
Subordinated notes
Amortized Cost
Due Within 5 years	3,000	0
Due After 5 years through 10 years	2,000	4,608
Due After 10 years	0	0
Amortized Cost	5,000	4,608
Fair Value
Due Within 5 years	2,830	0
Due After 5 years through 10 years	1,772	4,626
Due After 10 years	0	0
Total	4,602	4,626
SBA loan pools
Amortized Cost
Due Within 5 years	0	0
Due After 5 years through 10 years	1,449	0
Due After 10 years	5,342	5,772
Amortized Cost	6,791	5,772
Fair Value
Due Within 5 years	0	0
Due After 5 years through 10 years	1,438	0
Due After 10 years	4,280	5,603
Total	5,718	5,603
Municipal bonds
Amortized Cost
Due Within 5 years	154	0
Due After 5 years through 10 years	407	563
Due After 10 years	0	0
Amortized Cost	561	563
Fair Value
Due Within 5 years	139	0
Due After 5 years through 10 years	360	562
Due After 10 years	0	0
Total	499	562
U. S. Government agency and mortgage-backed securities
Amortized Cost
Due Within 5 years	0	13,876
Due After 5 years through 10 years	5,276	0
Due After 10 years	68,204	53,974
Amortized Cost	73,480	67,850
Fair Value
Due Within 5 years	0	13,835
Due After 5 years through 10 years	4,129	0
Due After 10 years	54,917	52,794
Total	$ 59,046	$ 66,629