v3.25.4
Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 05, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 0-7818    
Entity Registrant Name INDEPENDENT BANK CORPORATION    
Entity Incorporation, State or Country Code MI    
Entity Tax Identification Number 38-2032782    
Entity Address, Address Line One 4200 East Beltline    
Entity Address, City or Town Grand Rapids    
Entity Address, State or Province MI    
Entity Address, Postal Zip Code 49525    
City Area Code 616    
Local Phone Number 527-5820    
Security12bTitle Common Stock, No Par Value    
Trading Symbol IBCP    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 655,032,770
Entity Common Stock, Shares Outstanding   20,588,446  
Documents Incorporated by Reference
Documents incorporated by reference: Portions of our definitive proxy statement and annual report, to be delivered to shareholders in connection with the April 21, 2026 Annual Meeting of Shareholders, are incorporated by reference into Part I, Part II, Part III, and Part IV of this Form 10-K.
    
Entity central index key 0000039311    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Amendment flag false