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Document And Entity Information
Jan. 21, 2025
Document Information [Line Items]  
Entity, Registrant Name FS BANCORP, INC.
Document, Type 8-K
Document, Period End Date Jan. 21, 2025
Entity, Incorporation, State or Country Code WA
Entity, File Number 001-35589
Entity, Tax Identification Number 45-4585178
Entity, Address, Address Line One 6920 220th Street SW
Entity, Address, City or Town Mountlake Terrace
Entity, Address, State or Province WA
Entity, Address, Postal Zip Code ​98043
City Area Code 425
Local Phone Number 771-5299
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $.01 per share
Trading Symbol FSBW
Security Exchange Name NASDAQ
Entity, Emerging Growth Company false
Amendment Flag false
Entity, Central Index Key 0001530249