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Business Combinations - Additional Information (Details)
 3 Months Ended 9 Months Ended
Mar. 01, 2025
USD ($)
Loan
shares
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Business Acquisition [Line Items]          
Acquisition related expense       $ 12,000,000  
Provision for credit losses on acquired loans         $ 9,500,000
Intangible amortization   $ 1,728,000 $ 198,000 4,140,000 604,000
Fair value on acquired loans   1,600,000   1,600,000  
Business acquisitions adjustment to net income loss after tax     649,000 $ 433,000 1,900,000
Fair value marks on acquired loans, which increased net interest income     $ 2,400,000   $ 4,800,000
Fentura Financial, Inc. [Member]          
Business Acquisition [Line Items]          
Business acquisition description       On March 1, 2025, ChoiceOne completed the Merger, in an all stock transaction, of Fentura, the former parent company of The State Bank, with and into ChoiceOne, with ChoiceOne surviving the Merger.  
Reason for business combination       The primary reason for the Merger was to expand ChoiceOne's market presence and enhance its financial strength by integrating Fentura's substantial customer base.  
Number of branch offices | Loan 20        
Number of loan production offices | Loan 1        
Total assets $ 1,751,629,000        
Total loans 1,400,000,000        
Total deposits $ 1,431,881,000        
Number of shares issued (in shares) | shares 6,070,836        
Consideration $ 192,992,000        
Acquisition related expense   $ 0   $ 13,900,000