 NEW YORK--BUSINESS WIRE--Kroll Bond Rating Agency KBRA assigns a senior unsecured debt rating of BBB, a subordinated debt rating of BBB-, and a short-term debt rating of K3 for Mountlake Terrace, Washington-based FS Bancorp, Inc. NASDAQ: FSBW the company. In addition, KBRA assigns deposit and senior unsecured debt ratings of BBB, a subordinated debt rating of BBB, and short-term deposit and debt ratings of K2 for the subsidiary bank, 1st Security Bank of Washington. The Outlook for a 