Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2025	May 07, 2025
Document And Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2025
Document Transition Report	false
Entity File Number	000-16084
Entity Registrant Name	CITIZENS & NORTHERN CORPORATION
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	23-2451943
Entity Address, Address Line One	90-92 MAIN STREET
Entity Address, City or Town	WELLSBORO
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	16901
City Area Code	570
Local Phone Number	724-3411
Title of 12(b) Security	Common Stock Par Value $1.00
Trading Symbol	CZNC
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		15,494,591
Entity Central Index Key	0000810958
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
Amendment Flag	false