<SEC-DOCUMENT>0000842517-26-000190-index.html : 20260827
<SEC-HEADER>0000842517-26-000190.hdr.sgml : 20260827
<ACCEPTANCE-DATETIME>20260827163234
ACCESSION NUMBER: 0000842517-26-000190
CONFORMED SUBMISSION TYPE: 8-K
PUBLIC DOCUMENT COUNT: 13
CONFORMED PERIOD OF REPORT: 20260827
ITEM INFORMATION: Other Events
ITEM INFORMATION: Financial Statements and Exhibits
FILED AS OF DATE: 20260827
DATE AS OF CHANGE: 20260827

FILER:

 COMPANY DATA: 
 COMPANY CONFORMED NAME: ISABELLA BANK CORP
 CENTRAL INDEX KEY: 0000842517
 STANDARD INDUSTRIAL CLASSIFICATION: STATE COMMERCIAL BANKS [6022]
 ORGANIZATION NAME: 02 Finance
 EIN: 382830092
 STATE OF INCORPORATION: MI
 FISCAL YEAR END: 1231

 FILING VALUES:
 FORM TYPE: 8-K
 SEC ACT: 1934 Act
 SEC FILE NUMBER: 001-42639
 FILM NUMBER: 261331075

 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: 20170403

 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>8-K
<SEQUENCE>1
<FILENAME>isba-20260827.htm
<DESCRIPTION>8-K
<TEXT>
Document 1 - file: isba-20260827.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-99.1 <SEQUENCE>2 <FILENAME>isba_2026q3xdivannxex991.htm <DESCRIPTION>EX-99.1 <TEXT> Document 2 - file: isba_2026q3xdivannxex991.htm
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</DOCUMENT> <DOCUMENT> <TYPE>EX-101.PRE <SEQUENCE>5 <FILENAME>isba-20260827_pre.xml <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT <TEXT> Document 5 - file: isba-20260827_pre.xml
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>6 <FILENAME>logo.jpg <DESCRIPTION>ISBA LOGO <TEXT> Document 6 - file: logo.jpg
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</DOCUMENT> <DOCUMENT> <TYPE>XML <SEQUENCE>10 <FILENAME>Show.js <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 10 - file: Show.js
</DOCUMENT> <DOCUMENT> <TYPE>XML <SEQUENCE>12 <FILENAME>FilingSummary.xml <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 12 - file: FilingSummary.html
Document 12 - RAW XML: FilingSummary.xml
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</DOCUMENT> <DOCUMENT> <TYPE>ZIP <SEQUENCE>15 <FILENAME>0000842517-26-000190-xbrl.zip <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 15 - file: 0000842517-26-000190-xbrl.zip
</DOCUMENT> <DOCUMENT> <TYPE>XML <SEQUENCE>16 <FILENAME>isba-20260827_htm.xml <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 16 - file: isba-20260827_htm.html
Document 16 - RAW XML: isba-20260827_htm.xml
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