Regulatory Matters - Narrative (Details) $ in Millions	Dec. 31, 2022 USD ($)
Regulatory Matters [Abstract]
Undivided profits	$ 137.2

The cumulative amount of the subsidiary reporting entity's undistributed earnings or deficit.

No definition available.

Name:	ibcp_RetainedEarningsAccumulatedDeficitSubsidiary
Namespace Prefix:	ibcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant