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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 29, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 0-12507    
Entity Registrant Name ARROW FINANCIAL CORPORATION    
Entity Incorporation, State or Country Code NY    
Entity Tax Identification Number 22-2448962    
Entity Address, Address Line One 250 Glen Street,    
Entity Address, City or Town Glens Falls    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 12801    
City Area Code 518    
Local Phone Number 745-1000    
Title of 12(b) Security Common Stock, Par Value $1.00 per share    
Trading Symbol AROW    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status No    
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 false    
Entity Shell Company false    
Entity Public Float     $ 333,303,608
Entity Common Stock, Shares Outstanding (in shares)   16,553,058  
Documents Incorporated by Reference
Portions of the Registrant’s Proxy Statement for Annual Meeting of Shareholders to be held June 5, 2024 are incorporated by reference into Part III of this Form 10-K.
    
Auditor Name KPMG LLP    
Auditor Location Albany, New York    
Auditor Firm ID 185    
Entity Central Index Key 0000717538    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false