Accounting Policies - Loan Revenue Recognition (Details)	12 Months Ended
Dec. 31, 2023 payment
Loan Revenue Recognition [Abstract]
Number of days past due	90 days
Number of consecutive payments for mortgage loans missed	4

Number of past due days for commercial loan, installment loans and payment plan receivables when accrual of interest income is discontinued, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter.

No definition available.

Name:	ibcp_NumberOfPastDueDaysForCommercialLoanInstallmentLoansAndPaymentPlanReceivables
Namespace Prefix:	ibcp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration