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Fair Value Disclosures - Significant Assumptions (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets [Abstract] |  |
Securities available for sale | $ 509,511 | $ 559,182
Loans held for sale, carried at fair value | 12,492 | 7,643
U.S. agency |  |
Assets [Abstract] |  |
Securities available for sale | 8,647 | 8,159
U.S. agency residential mortgage-backed |  |
Assets [Abstract] |  |
Securities available for sale | 71,796 | 71,137
U.S. agency commercial mortgage-backed |  |
Assets [Abstract] |  |
Securities available for sale | 11,166 | 11,641
Private label mortgage-backed |  |
Assets [Abstract] |  |
Securities available for sale | 44,929 | 70,035
Other asset backed |  |
Assets [Abstract] |  |
Securities available for sale | 33,917 | 38,516
Obligations of states and political subdivisions |  |
Assets [Abstract] |  |
Securities available for sale | 276,746 | 288,791
Corporate |  |
Assets [Abstract] |  |
Securities available for sale | 61,333 | 69,921
Trust preferred |  |
Assets [Abstract] |  |
Securities available for sale | 977 | 982
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Derivative financial instruments | 0 | 0
Liabilities |  |
Derivatives | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets [Abstract] |  |
Securities available for sale | 509,511 | 559,182
Derivative financial instruments | 34,191 | 37,059
Liabilities |  |
Derivatives | 20,754 | 18,623
Significant Un- observable Inputs (Level 3) |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Derivative financial instruments | 0 | 0
Liabilities |  |
Derivatives | 0 | 0
Measured at Fair Value on a Recurring Basis |  |
Assets [Abstract] |  |
Loans held for sale, carried at fair value | 12,492 | 7,643
Capitalized mortgage loan servicing rights | 32,053 | 46,796
Derivative financial instruments | 34,191 | 37,059
Liabilities |  |
Derivatives | 20,754 | 18,623
Measured at Fair Value on a Recurring Basis | U.S. agency |  |
Assets [Abstract] |  |
Securities available for sale | 8,647 | 8,159
Measured at Fair Value on a Recurring Basis | U.S. agency residential mortgage-backed |  |
Assets [Abstract] |  |
Securities available for sale | 71,796 | 71,137
Measured at Fair Value on a Recurring Basis | U.S. agency commercial mortgage-backed |  |
Assets [Abstract] |  |
Securities available for sale | 11,166 | 11,641
Measured at Fair Value on a Recurring Basis | Private label mortgage-backed |  |
Assets [Abstract] |  |
Securities available for sale | 44,929 | 70,035
Measured at Fair Value on a Recurring Basis | Other asset backed |  |
Assets [Abstract] |  |
Securities available for sale | 33,917 | 38,516
Measured at Fair Value on a Recurring Basis | Obligations of states and political subdivisions |  |
Assets [Abstract] |  |
Securities available for sale | 276,746 | 288,791
Measured at Fair Value on a Recurring Basis | Corporate |  |
Assets [Abstract] |  |
Securities available for sale | 61,333 | 69,921
Measured at Fair Value on a Recurring Basis | Trust preferred |  |
Assets [Abstract] |  |
Securities available for sale | 977 | 982
Measured at Fair Value on a Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets [Abstract] |  |
Loans held for sale, carried at fair value | 0 | 0
Capitalized mortgage loan servicing rights | 0 | 0
Derivative financial instruments | 0 | 0
Liabilities |  |
Derivatives | 0 | 0
Measured at Fair Value on a Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. agency |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Measured at Fair Value on a Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. agency residential mortgage-backed |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Measured at Fair Value on a Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. agency commercial mortgage-backed |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Measured at Fair Value on a Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Private label mortgage-backed |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Measured at Fair Value on a Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other asset backed |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Measured at Fair Value on a Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Obligations of states and political subdivisions |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Measured at Fair Value on a Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Measured at Fair Value on a Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Trust preferred |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Measured at Fair Value on a Recurring Basis | Significant Other Observable Inputs (Level 2) |  |
Assets [Abstract] |  |
Loans held for sale, carried at fair value | 12,492 | 7,643
Capitalized mortgage loan servicing rights | 0 | 0
Derivative financial instruments | 34,191 | 37,059
Liabilities |  |
Derivatives | 20,754 | 18,623
Measured at Fair Value on a Recurring Basis | Significant Other Observable Inputs (Level 2) | U.S. agency |  |
Assets [Abstract] |  |
Securities available for sale | 8,647 | 8,159
Measured at Fair Value on a Recurring Basis | Significant Other Observable Inputs (Level 2) | U.S. agency residential mortgage-backed |  |
Assets [Abstract] |  |
Securities available for sale | 71,796 | 71,137
Measured at Fair Value on a Recurring Basis | Significant Other Observable Inputs (Level 2) | U.S. agency commercial mortgage-backed |  |
Assets [Abstract] |  |
Securities available for sale | 11,166 | 11,641
Measured at Fair Value on a Recurring Basis | Significant Other Observable Inputs (Level 2) | Private label mortgage-backed |  |
Assets [Abstract] |  |
Securities available for sale | 44,929 | 70,035
Measured at Fair Value on a Recurring Basis | Significant Other Observable Inputs (Level 2) | Other asset backed |  |
Assets [Abstract] |  |
Securities available for sale | 33,917 | 38,516
Measured at Fair Value on a Recurring Basis | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
Assets [Abstract] |  |
Securities available for sale | 276,746 | 288,791
Measured at Fair Value on a Recurring Basis | Significant Other Observable Inputs (Level 2) | Corporate |  |
Assets [Abstract] |  |
Securities available for sale | 61,333 | 69,921
Measured at Fair Value on a Recurring Basis | Significant Other Observable Inputs (Level 2) | Trust preferred |  |
Assets [Abstract] |  |
Securities available for sale | 977 | 982
Measured at Fair Value on a Recurring Basis | Significant Un- observable Inputs (Level 3) |  |
Assets [Abstract] |  |
Loans held for sale, carried at fair value | 0 | 0
Capitalized mortgage loan servicing rights | 32,053 | 46,796
Derivative financial instruments | 0 | 0
Liabilities |  |
Derivatives | 0 | 0
Measured at Fair Value on a Recurring Basis | Significant Un- observable Inputs (Level 3) | U.S. agency |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Measured at Fair Value on a Recurring Basis | Significant Un- observable Inputs (Level 3) | U.S. agency residential mortgage-backed |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Measured at Fair Value on a Recurring Basis | Significant Un- observable Inputs (Level 3) | U.S. agency commercial mortgage-backed |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Measured at Fair Value on a Recurring Basis | Significant Un- observable Inputs (Level 3) | Private label mortgage-backed |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Measured at Fair Value on a Recurring Basis | Significant Un- observable Inputs (Level 3) | Other asset backed |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Measured at Fair Value on a Recurring Basis | Significant Un- observable Inputs (Level 3) | Obligations of states and political subdivisions |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Measured at Fair Value on a Recurring Basis | Significant Un- observable Inputs (Level 3) | Corporate |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Measured at Fair Value on a Recurring Basis | Significant Un- observable Inputs (Level 3) | Trust preferred |  |
Assets [Abstract] |  |
Securities available for sale | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Collateral dependent loans | Commercial | Commercial and industrial |  |
Assets |  |
Loans receivable, fair value disclosure | 3,702 | 4,205
Measured at Fair Value on a Non-recurring Basis: | Collateral dependent loans | Commercial | Commercial real estate |  |
Assets |  |
Loans receivable, fair value disclosure | 12,627 | 132
Measured at Fair Value on a Non-recurring Basis: | Collateral dependent loans | Mortgage | 1-4 family owner occupied - non-jumbo |  |
Assets |  |
Loans receivable, fair value disclosure | 601 | 627
Measured at Fair Value on a Non-recurring Basis: | Collateral dependent loans | Mortgage | 1-4 family non-owner occupied |  |
Assets |  |
Loans receivable, fair value disclosure | 61 |
Measured at Fair Value on a Non-recurring Basis: | Collateral dependent loans | Mortgage | 1-4 family - 2nd lien |  |
Assets |  |
Loans receivable, fair value disclosure | 194 | 170
Measured at Fair Value on a Non-recurring Basis: | Collateral dependent loans | Mortgage | Resort lending |  |
Assets |  |
Loans receivable, fair value disclosure | 37 | 92
Measured at Fair Value on a Non-recurring Basis: | Collateral dependent loans | Installment | Boat lending |  |
Assets |  |
Loans receivable, fair value disclosure | 431 | 56
Measured at Fair Value on a Non-recurring Basis: | Collateral dependent loans | Installment | Recreational vehicle lending |  |
Assets |  |
Loans receivable, fair value disclosure | 125 | 172
Measured at Fair Value on a Non-recurring Basis: | Collateral dependent loans | Installment | Other |  |
Assets |  |
Loans receivable, fair value disclosure | 23 | 59
Measured at Fair Value on a Non-recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral dependent loans | Commercial | Commercial and industrial |  |
Assets |  |
Loans receivable, fair value disclosure | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral dependent loans | Commercial | Commercial real estate |  |
Assets |  |
Loans receivable, fair value disclosure | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral dependent loans | Mortgage | 1-4 family owner occupied - non-jumbo |  |
Assets |  |
Loans receivable, fair value disclosure | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral dependent loans | Mortgage | 1-4 family non-owner occupied |  |
Assets |  |
Loans receivable, fair value disclosure | 0 |
Measured at Fair Value on a Non-recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral dependent loans | Mortgage | 1-4 family - 2nd lien |  |
Assets |  |
Loans receivable, fair value disclosure | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral dependent loans | Mortgage | Resort lending |  |
Assets |  |
Loans receivable, fair value disclosure | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral dependent loans | Installment | Boat lending |  |
Assets |  |
Loans receivable, fair value disclosure | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral dependent loans | Installment | Recreational vehicle lending |  |
Assets |  |
Loans receivable, fair value disclosure | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateral dependent loans | Installment | Other |  |
Assets |  |
Loans receivable, fair value disclosure | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Significant Other Observable Inputs (Level 2) | Collateral dependent loans | Commercial | Commercial and industrial |  |
Assets |  |
Loans receivable, fair value disclosure | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Significant Other Observable Inputs (Level 2) | Collateral dependent loans | Commercial | Commercial real estate |  |
Assets |  |
Loans receivable, fair value disclosure | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Significant Other Observable Inputs (Level 2) | Collateral dependent loans | Mortgage | 1-4 family owner occupied - non-jumbo |  |
Assets |  |
Loans receivable, fair value disclosure | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Significant Other Observable Inputs (Level 2) | Collateral dependent loans | Mortgage | 1-4 family non-owner occupied |  |
Assets |  |
Loans receivable, fair value disclosure | 0 |
Measured at Fair Value on a Non-recurring Basis: | Significant Other Observable Inputs (Level 2) | Collateral dependent loans | Mortgage | 1-4 family - 2nd lien |  |
Assets |  |
Loans receivable, fair value disclosure | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Significant Other Observable Inputs (Level 2) | Collateral dependent loans | Mortgage | Resort lending |  |
Assets |  |
Loans receivable, fair value disclosure | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Significant Other Observable Inputs (Level 2) | Collateral dependent loans | Installment | Boat lending |  |
Assets |  |
Loans receivable, fair value disclosure | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Significant Other Observable Inputs (Level 2) | Collateral dependent loans | Installment | Recreational vehicle lending |  |
Assets |  |
Loans receivable, fair value disclosure | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Significant Other Observable Inputs (Level 2) | Collateral dependent loans | Installment | Other |  |
Assets |  |
Loans receivable, fair value disclosure | 0 | 0
Measured at Fair Value on a Non-recurring Basis: | Significant Un- observable Inputs (Level 3) | Collateral dependent loans | Commercial | Commercial and industrial |  |
Assets |  |
Loans receivable, fair value disclosure | 3,702 | 4,205
Measured at Fair Value on a Non-recurring Basis: | Significant Un- observable Inputs (Level 3) | Collateral dependent loans | Commercial | Commercial real estate |  |
Assets |  |
Loans receivable, fair value disclosure | 12,627 | 132
Measured at Fair Value on a Non-recurring Basis: | Significant Un- observable Inputs (Level 3) | Collateral dependent loans | Mortgage | 1-4 family owner occupied - non-jumbo |  |
Assets |  |
Loans receivable, fair value disclosure | 601 | 627
Measured at Fair Value on a Non-recurring Basis: | Significant Un- observable Inputs (Level 3) | Collateral dependent loans | Mortgage | 1-4 family non-owner occupied |  |
Assets |  |
Loans receivable, fair value disclosure | 61 |
Measured at Fair Value on a Non-recurring Basis: | Significant Un- observable Inputs (Level 3) | Collateral dependent loans | Mortgage | 1-4 family - 2nd lien |  |
Assets |  |
Loans receivable, fair value disclosure | 194 | 170
Measured at Fair Value on a Non-recurring Basis: | Significant Un- observable Inputs (Level 3) | Collateral dependent loans | Mortgage | Resort lending |  |
Assets |  |
Loans receivable, fair value disclosure | 37 | 92
Measured at Fair Value on a Non-recurring Basis: | Significant Un- observable Inputs (Level 3) | Collateral dependent loans | Installment | Boat lending |  |
Assets |  |
Loans receivable, fair value disclosure | 431 | 56
Measured at Fair Value on a Non-recurring Basis: | Significant Un- observable Inputs (Level 3) | Collateral dependent loans | Installment | Recreational vehicle lending |  |
Assets |  |
Loans receivable, fair value disclosure | 125 | 172
Measured at Fair Value on a Non-recurring Basis: | Significant Un- observable Inputs (Level 3) | Collateral dependent loans | Installment | Other |  |
Assets |  |
Loans receivable, fair value disclosure | $ 23 | $ 59

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ibcp_InstallmentOtherMember
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Data Type: | na
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