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Related Party Transaction
 12 Months Ended
Dec. 31, 2023
Related Party Transactions [Abstract]  
Related Party Transaction RELATED PARTY TRANSACTION
A member of the GFNB Board of Directors, is the Chief Executive Officer of the general contractor leading the multi-year renovation project to enhance and improve the downtown Glens Falls Main Campus. The reconstruction provided added energy efficiency and more collaborative work space. In 2023, Arrow paid $2.8 million to this general contractor. GFNB is a subsidiary of Arrow Financial Corporation.