v3.25.2
Cover Page - shares
6 Months Ended
Jun. 30, 2025
Jul. 31, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
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 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)   16,469,026
Entity Central Index Key 0000717538  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag false