Deposits - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deposits [Abstract]
Time deposits, denominations amount	$ 250	$ 250
Aggregate amount of time deposits of $0.25 million or more	$ 176,600	$ 82,900

The denominations amount of aggregate domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 or more.

No definition available.

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