PARENT COMPANY ONLY - Condensed Income Statement and Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income before equity in undistributed income (excess distributions) of subsidiaries	$ 31,871	$ 30,483	$ 32,350
Net income	25,958	24,148	26,618
COMPREHENSIVE INCOME (LOSS)	27,634	35,589	(28,286)
Parent Company
Dividends from Citizens & Northern Bank	17,341	19,405	19,483
Expenses	(1,644)	(2,003)	(1,695)
Income before equity in undistributed income (excess distributions) of subsidiaries	17,197	19,202	17,788
Equity in undistributed income (excess distributions) of subsidiaries	8,761	4,946	8,830
Net income	25,958	24,148	26,618
COMPREHENSIVE INCOME (LOSS)	27,634	35,589	(28,286)
Citizens and Northern Investment Corporation [Member] | Citizens and Northern Investment Corporation [Member]
Dividends from Citizens & Northern Bank	$ 1,500	$ 1,800	$ 0