ACCOUNTING POLICIES - Nature of Operations (Details)	12 Months Ended
Dec. 31, 2025 facility
Accounting Policies [Abstract]
Number of loan production facilities	1
Percentage of loan portfolio secured by real estate	44.30%

Refers to percentage of loan portfolio which was secured by real estate as on balance sheet date.

No definition available.

Name:	ibcp_PercentageOfLoanPortfolioSecuredByRealEstate
Namespace Prefix:	ibcp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant