XML 12 R1.htm IDEA: XBRL DOCUMENT v3.25.0.1
Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Feb. 24, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Document Transition Report false    
Entity File Number 001-34095    
Entity Registrant Name FIRST BUSINESS FINANCIAL SERVICES, INC.    
Entity Incorporation, State or Country Code WI    
Entity Tax Identification Number 39-1576570    
Entity Address, Address Line One 401 Charmany Drive    
Entity Address, City or Town Madison    
Entity Address, State or Province WI    
Entity Address, Postal Zip Code 53719    
City Area Code 608    
Local Phone Number 238-8008    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol FBIZ    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag true    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   8,301,126  
Entity Central Index Key 0001521951    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2024    
Documents Incorporated by Reference

Part III – Portions of the Proxy Statement for the Annual Meeting of Shareholders to be held on April 25, 2025 are incorporated by reference into Part III hereof.

    
Document Fiscal Period Focus FY    
Entity Public Float     $ 306.8
Amendment Flag false    
Auditor Name Crowe LLP    
Auditor Location Oakbrook Terrace, Illinois    
Auditor Firm ID 173    
Auditor Opinion

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets of First Business Financial Services, Inc. (the "Corporation") as of December 31, 2024 and 2023, the related consolidated statements of income, comprehensive income, changes in stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2024, and the related notes (collectively referred to as the "financial statements"). We also have audited the Corporation’s internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control – Integrated Framework: (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the financial statements referred to above present fairly, in all material respects, the financial position of the Corporation as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the years in the three-year period ended December 31, 2024 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Corporation maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control – Integrated Framework: (2013) issued by COSO.