PARENT COMPANY ONLY - Condensed Income Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income before equity in undistributed income (excess distributions) of subsidiaries	$ 30,483	$ 32,350	$ 37,687
Net income	24,148	26,618	30,554
Parent Company
Dividends from Citizens & Northern Bank	19,405	19,483	20,200
Expenses	(2,003)	(1,695)	(1,691)
Income before equity in undistributed income (excess distributions) of subsidiaries	19,202	17,788	18,509
Equity in undistributed income (excess distributions) of subsidiaries	4,946	8,830	12,045
Net income	24,148	26,618	30,554
Citizens and Northern Investment Corporation [Member] | Citizens and Northern Investment Corporation [Member]
Dividends from Citizens & Northern Bank	$ 1,800	$ 0	$ 0