<SEC-DOCUMENT>0000950170-25-062084-index.html : 20250502
<SEC-HEADER>0000950170-25-062084.hdr.sgml : 20250502
<ACCEPTANCE-DATETIME>20250501175712
ACCESSION NUMBER:		0000950170-25-062084
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		25
CONFORMED PERIOD OF REPORT:	20250425
ITEM INFORMATION:		Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year
ITEM INFORMATION:		Submission of Matters to a Vote of Security Holders
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20250502
DATE AS OF CHANGE:		20250501

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FIRST BUSINESS FINANCIAL SERVICES, INC.
		CENTRAL INDEX KEY:			0001521951
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		ORGANIZATION NAME:           	02 Finance
		EIN:				391576570
		STATE OF INCORPORATION:			WI
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34095
		FILM NUMBER:		25904703

	BUSINESS ADDRESS:	
		STREET 1:		401 CHARMANY DRIVE
		CITY:			MADISON
		STATE:			WI
		ZIP:			53719
		BUSINESS PHONE:		608-238-8008

	MAIL ADDRESS:	
		STREET 1:		401 CHARMANY DRIVE
		STREET 2:		PO BOX 44961
		CITY:			MADISON
		STATE:			WI
		ZIP:			53744

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	First Business Financial Services, Inc.
		DATE OF NAME CHANGE:	20110527
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>fbiz-20250425.htm
<DESCRIPTION>8-K
<TEXT>
Document 1 - file: fbiz-20250425.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-3.1
<SEQUENCE>2
<FILENAME>fbiz-ex3_1.htm
<DESCRIPTION>EX-3.1
<TEXT>
Document 2 - file: fbiz-ex3_1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-3.2
<SEQUENCE>3
<FILENAME>fbiz-ex3_2.htm
<DESCRIPTION>EX-3.2
<TEXT>
Document 3 - file: fbiz-ex3_2.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>4
<FILENAME>fbiz-ex99_1.htm
<DESCRIPTION>EX-99.1
<TEXT>
Document 4 - file: fbiz-ex99_1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>fbiz-ex99_1s1.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: fbiz-ex99_1s1.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>fbiz-ex99_1s2.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: fbiz-ex99_1s2.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>fbiz-ex99_1s3.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: fbiz-ex99_1s3.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>fbiz-ex99_1s4.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: fbiz-ex99_1s4.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>fbiz-ex99_1s5.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: fbiz-ex99_1s5.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>fbiz-ex99_1s6.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: fbiz-ex99_1s6.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>11
<FILENAME>fbiz-ex99_1s7.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 11 - file: fbiz-ex99_1s7.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>12
<FILENAME>fbiz-ex99_1s8.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 12 - file: fbiz-ex99_1s8.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>13
<FILENAME>fbiz-ex99_1s9.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 13 - file: fbiz-ex99_1s9.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>14
<FILENAME>fbiz-ex99_1s10.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 14 - file: fbiz-ex99_1s10.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>15
<FILENAME>fbiz-ex99_1s11.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 15 - file: fbiz-ex99_1s11.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.SCH
<SEQUENCE>16
<FILENAME>fbiz-20250425.xsd
<DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA WITH EMBEDDED LINKBASES DOCUMENT
<TEXT>
Document 16 - file: fbiz-20250425.xsd

</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>18
<FILENAME>R1.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 18 - file: R1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EXCEL
<SEQUENCE>19
<FILENAME>Financial_Report.xlsx
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 19 - file: Financial_Report.xlsx

</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>20
<FILENAME>Show.js
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 20 - file: Show.js

</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>21
<FILENAME>report.css
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 21 - file: report.css

</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>23
<FILENAME>FilingSummary.xml
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 23 - file: FilingSummary.html

Document 23 - RAW XML: FilingSummary.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>JSON
<SEQUENCE>25
<FILENAME>MetaLinks.json
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 25 - file: MetaLinks.json

</DOCUMENT>
<DOCUMENT>
<TYPE>ZIP
<SEQUENCE>26
<FILENAME>0000950170-25-062084-xbrl.zip
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 26 - file: 0000950170-25-062084-xbrl.zip

</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>27
<FILENAME>fbiz-20250425_htm.xml
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 27 - file: fbiz-20250425_htm.html

Document 27 - RAW XML: fbiz-20250425_htm.xml

</DOCUMENT>
</SEC-DOCUMENT>