XML 5 R1.htm IDEA: XBRL DOCUMENT v3.24.0.1
Cover
Jan. 25, 2024
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jan. 25, 2024
Entity File Number 1-34095
Entity Registrant Name First Business Financial Services, Inc.
Entity Central Index Key 0001521951
Entity Tax Identification Number 39-1576570
Entity Incorporation, State or Country Code WI
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.01 par value
Trading Symbol FBIZ
Security Exchange Name NASDAQ
Entity Emerging Growth Company false