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Cover Page Document
Jan. 25, 2023
Cover Page [Abstract]  
Document Type 8-K
Document Period End Date Jan. 25, 2023
Entity Registrant Name WASHINGTON TRUST BANCORP, INC.
Entity Incorporation, State or Country Code RI
Entity File Number 001-32991
Entity Tax Identification Number 05-0404671
Entity Address, Address Line One 23 Broad Street
Entity Address, City or Town Westerly,
Entity Address, State or Province RI
Entity Address, Postal Zip Code 02891
City Area Code (401)
Local Phone Number 348-1200
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0000737468
Amendment Flag false