FS Bancorp, Inc. operates as a bank holding company, which engages in the provision of banking and financial services through its subsidiary. It operates through the Commercial and Consumer Banking, and Home Lending segments. The Commercial and Consumer Banking segment focuses on diversified financial products and services to its commercial and consumer customers through bank branches, automated teller machines (ATM), online banking platforms, mobile banking apps, and telephone banking. The Home Lending segment offers one-to-four-family residential mortgage loans primarily for sale in the secondary markets as well as originating adjustable rate mortgage. The company was founded in September 2011 and is headquartered in Mountlake Terrace, WA.