RESTRICTIONS ON CASH AND DUE FROM BANKS (Details) - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Restricted Cash and Investments [Abstract]
Average reserve balances maintained	$ 0	$ 0
Reserve balances held at unrelated financial institutions	$ 100,000	$ 0

Bank is required to maintain reserve balances in the form of vault cash and non-interest earning balances with the FRB. The amount refers to average reserve balances to be maintained.

No definition available.

Name:	ibcp_AverageReserveBalanceRequiredToBeMaintained
Namespace Prefix:	ibcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration