Statements of income of Salisbury Bancorp, Inc. (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Net income	$ 16,473	$ 11,940	$ 11,136
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiary	3,994	3,787	3,546
Interest income	11	6	10
Interest expense	1,000	618	624
Non-interest expenses	574	495	417
Income before taxes and equity in undistributed net income of subsidiary	2,431	2,680	2,515
Income tax benefit	386	273	252
Income before equity in undistributed net income of subsidiary	2,817	2,953	2,767
Equity in undistributed net income of subsidiary	13,656	8,987	8,369
Net income	$ 16,473	$ 11,940	$ 11,136

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