XML 12 R1.htm IDEA: XBRL DOCUMENT v3.25.1
Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Mar. 13, 2025
Jun. 30, 2024
Document Information [Line Items]      
Entity, Registrant Name FS BANCORP, INC.    
Current Fiscal Year End Date --12-31    
Document, Fiscal Period Focus FY    
Document, Fiscal Year Focus 2024    
Document, Type 10-K/A    
Document, Annual Report true    
Document, Period End Date Dec. 31, 2024    
Document, Transition Report false    
Entity, File Number 001-35589    
Entity, Incorporation, State or Country Code WA    
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    
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol FSBW    
Security Exchange Name NASDAQ    
Entity, Well-known Seasoned Issuer No    
Entity, Voluntary Filers No    
Entity, Current Reporting Status Yes    
Entity, Interactive Data, Current Yes    
Entity, Filer Category Accelerated Filer    
Entity, Small Business true    
Entity, Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document, Financial Statement Error Correction Flag false    
Entity, Shell Company false    
Entity, Public Float     $ 255,164,361
Entity, Common Stock Shares, Outstanding   7,762,827  
Amendment Description FS Bancorp, Inc. (the “Company”) is filing this 10-K/A (Amendment No. 1) (“Amendment No. 1”) to the Annual Report on Form 10-K for the year ended December 31, 2024 (the “Original Form 10-K”), as filed with the United States Securities and Exchange Commission (the “SEC”) on March 17, 2025 (the “Original Filing Date”), solely to correct a certain inadvertent typographical error contained in Item 8 related to the Opinion of the work completed by Moss Adams LLP, the Company's independent registered accounting firm.  The Opinion was provided timely by Moss Adams LLP and received by the Company at the time of the Original Filing Date. Pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, this Amendment No. 1 is signed by a duly authorized representative of the Company. It includes, as Exhibits 31.1 and 31.2, the certifications of the Principal Executive Officer and Principal Financial Officer of the Company pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, as well as the consent of the Company’s independent registered public accounting firm for the applicable period as Exhibits 23. Except as described above, no changes have been made to the Original Form 10-K, and this Amendment No. 1 does not modify, amend or update the financial or other information contained in the Original Form 10-K. This Amendment No. 1 does not reflect any events that have occurred on or after the Original Filing Date. Among other things, the Company has not revised forward-looking statements made in the Original Form 10-K to reflect events that occurred or facts that became known to the Company after the Original Filing Date. Therefore, this Amendment No. 1 should be read in conjunction with the Original Form 10-K and any other documents the Company has filed with the SEC on or after the Original Filing Date.    
Amendment Flag true    
Entity, Central Index Key 0001530249