    <SEC-DOCUMENT>0000842517-23-000062-index.html : 20230327
    <SEC-HEADER>0000842517-23-000062.hdr.sgml : 20230327
    <ACCEPTANCE-DATETIME>20230327090904
    ACCESSION NUMBER:		0000842517-23-000062
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		8
    CONFORMED PERIOD OF REPORT:	20230509
    FILED AS OF DATE:		20230327
    DATE AS OF CHANGE:		20230327

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			ISABELLA BANK Corp
    		CENTRAL INDEX KEY:			0000842517
    		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
    		IRS NUMBER:				382830092
    		STATE OF INCORPORATION:			MI
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-18415
    		FILM NUMBER:		23761600

    	BUSINESS ADDRESS:
    		STREET 1:		401 NORTH MAIN STREET
    		CITY:			MT PLEASANT
    		STATE:			MI
    		ZIP:			48858
    		BUSINESS PHONE:		9897729471

    	MAIL ADDRESS:
    		STREET 1:		401 NORTH MAIN STREET
    		CITY:			MT PLEASANT
    		STATE:			MI
    		ZIP:			48858

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	ISABELLA BANK CORP
    		DATE OF NAME CHANGE:	20080602

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	IBT BANCORP INC /MI/
    		DATE OF NAME CHANGE:	19920703
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>isba_2023xdef14a.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: isba_2023xdef14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>a2023proxycardpage1a.jpg
    <DESCRIPTION>PROXY CARD
    <TEXT>
    Document 2 - file: a2023proxycardpage1a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>a2023proxycardpage2a.jpg
    <DESCRIPTION>PROXY CARD
    <TEXT>
    Document 3 - file: a2023proxycardpage2a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>chart-7733153cbb604837865.jpg
    <DESCRIPTION>CHART
    <TEXT>
    Document 4 - file: chart-7733153cbb604837865.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>chart-fb642e839c00411ea6d.jpg
    <DESCRIPTION>CHART
    <TEXT>
    Document 5 - file: chart-fb642e839c00411ea6d.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>debracampbella04.jpg
    <DESCRIPTION>SIGNATURE
    <TEXT>
    Document 6 - file: debracampbella04.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>ibclogoa04.jpg
    <DESCRIPTION>ISBA LOGO
    <TEXT>
    Document 7 - file: ibclogoa04.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>proxycovervotea04.jpg
    <DESCRIPTION>VOTING
    <TEXT>
    Document 8 - file: proxycovervotea04.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>