    <SEC-DOCUMENT>0001521951-22-000019-index.html : 20220308
    <SEC-HEADER>0001521951-22-000019.hdr.sgml : 20220308
    <ACCEPTANCE-DATETIME>20220308081916
    ACCESSION NUMBER:		0001521951-22-000019
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		24
    CONFORMED PERIOD OF REPORT:	20211231
    FILED AS OF DATE:		20220308
    DATE AS OF CHANGE:		20220308

    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:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-34095
    		FILM NUMBER:		22720387

    	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>DEF 14A
    <SEQUENCE>1
    <FILENAME>a0308222021def14aproxystmt.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: a0308222021def14aproxystmt.htm

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    <FILENAME>calendar.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: calendar.jpg

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    <FILENAME>cchambass_croppedandedited.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: cchambass_croppedandedited.jpg

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    <FILENAME>cchambassignature.jpg
    <DESCRIPTION>GRAPHIC
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    Document 4 - file: cchambassignature.jpg

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    <FILENAME>cchavarria_croppedandedited.jpg
    <DESCRIPTION>GRAPHIC
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    Document 5 - file: cchavarria_croppedandedited.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 6 - file: csanders_croppedandedited.jpg

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    <SEQUENCE>7
    <FILENAME>dolszewski_croppedandedited.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: dolszewski_croppedandedited.jpg

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    <FILENAME>fbb_logoxrgb.jpg
    <DESCRIPTION>GRAPHIC
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    Document 8 - file: fbb_logoxrgb.jpg

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    <FILENAME>image.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: image.jpg

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    <SEQUENCE>10
    <FILENAME>jeddy_croppedandedited.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: jeddy_croppedandedited.jpg

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    <SEQUENCE>11
    <FILENAME>jharris_croppedandedited.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: jharris_croppedandedited.jpg

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    <FILENAME>jkilcoyne_croppedandedited.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: jkilcoyne_croppedandedited.jpg

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    <FILENAME>jkilcoynesignature.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: jkilcoynesignature.jpg

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    <FILENAME>klorenz_croppedandedited.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: klorenz_croppedandedited.jpg

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    <FILENAME>laasignature.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: laasignature.jpg

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    <FILENAME>lbenson_croppedandedited.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: lbenson_croppedandedited.jpg

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    <FILENAME>mbugher_croppedandedited.jpg
    <DESCRIPTION>GRAPHIC
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    Document 17 - file: mbugher_croppedandedited.jpg

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    <SEQUENCE>18
    <FILENAME>mlicon.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: mlicon.jpg

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    <FILENAME>onlineicon.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: onlineicon.jpg

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    <FILENAME>phoneicon.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: phoneicon.jpg

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    <SEQUENCE>21
    <FILENAME>proxycard_pagex1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 21 - file: proxycard_pagex1.jpg

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    <SEQUENCE>22
    <FILENAME>proxycard_pagex2.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 22 - file: proxycard_pagex2.jpg

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    <SEQUENCE>23
    <FILENAME>rkauten_linkedin1.jpg
    <DESCRIPTION>GRAPHIC
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    Document 23 - file: rkauten_linkedin1.jpg

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    <SEQUENCE>24
    <FILENAME>tkeane_teams.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 24 - file: tkeane_teams.jpg

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