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Period of time the maturity date of a troubled debt restructured loan is extended for.

No definition available.

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Period of time the maturity date of a troubled debt restructured loan is extended for in certain circumstances.

No definition available.

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Period of time an interest rate is modified for in a troubled debt restructuring.

No definition available.

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Period of time an interest rate is modified for in a troubled debt restructuring in certain circumstances.

No definition available.

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- References

No definition available.

Name:	ibcp_LoansClassifiedAsTroubledDebtRestructuringsAbstract
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Data Type:	xbrli:stringItemType
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The number of consecutive timely payments required to be received for non-accrual loans to be removed from inclusion with the non-performing troubled debt restructurings.

No definition available.

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Balance Type:	na
Period Type:	duration

The period when loan payment is considered to be in default.

No definition available.

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

Name:	ibcp_TdrThatSubsequentlyDefaultedAbstract
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Data Type:	xbrli:stringItemType
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Disclosure of troubled debt restructurings.

No definition available.

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Specific allowance for loan and lease losses on receivable financings that are classified as troubled debt restructurings.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of increase (decrease) of allowance reserve for credit loss.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Number of financing receivables that have been modified by troubled debt restructurings.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524

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Data Type:	xbrli:integerItemType
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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Reflects the amount of the write-down related to a troubled debt restructuring.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

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Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
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Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
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Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_NonperformingFinancingReceivableMember
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Data Type:	na
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Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Namespace Prefix:
Data Type:	na
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Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ibcp_CommercialLandLandDevelopmentRealEstateConstructionFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialLoanMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ibcp_Family14Member
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Data Type:	na
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Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ibcp_ResortLendingMember
Namespace Prefix:
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Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ibcp_HomeEquityFirstLienMember
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Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=ibcp_InstallmentPortfolioSegmentMember
Namespace Prefix:
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Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ibcp_BoatLendingMember
Namespace Prefix:
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