Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Feb. 24, 2025	Jun. 30, 2024
Document And Entity Information
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Document Transition Report	false
Entity File Number	0-16084
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 Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float				$ 263,572,799
Entity Common Stock, Shares Outstanding (in shares)			15,466,068
Entity Central Index Key	0000810958
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false
Auditor Name	Crowe LLP	Baker Tilly US, LLP
Auditor Location	Columbus, Ohio	Pittsburgh, Pennsylvania
Auditor Firm ID	173	23