<SEC-DOCUMENT>0001521951-21-000006-index.html : 20210128
<SEC-HEADER>0001521951-21-000006.hdr.sgml : 20210128
<ACCEPTANCE-DATETIME>20210128133016
ACCESSION NUMBER:		0001521951-21-000006
CONFORMED SUBMISSION TYPE:	13F-HR
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20201231
FILED AS OF DATE:		20210128
DATE AS OF CHANGE:		20210128
EFFECTIVENESS DATE:		20210128

FILER:

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

	FILING VALUES:
		FORM TYPE:		13F-HR
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	028-15585
		FILM NUMBER:		21563878

	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>13F-HR
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
Document 1 - file: primary_doc.html

Document 1 - RAW XML: primary_doc.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>INFORMATION TABLE
<SEQUENCE>2
<FILENAME>information_table.xml
<DESCRIPTION>INFORMATION TABLE
<TEXT>
Document 2 - file: information_table.html

Document 2 - RAW XML: information_table.xml

</DOCUMENT>
</SEC-DOCUMENT>