v3.26.1
STOCK COMPENSATION - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to nonvested stock options granted $ 0   $ 0    
Shares granted (up to) (in shares)     0 0  
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense restricted stock awards 1,000,000.0 $ 645,000 $ 1,800,000 $ 1,100,000  
Unrecognized compensation cost related to nonvested restricted stock 6,400,000   6,400,000   $ 3,600,000
Fair value of shares vesting during period 14,000 9,000 2,700,000 1,500,000  
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Income tax benefit from share-based compensation $ 218,000 $ 135,000 $ 384,000 $ 231,000  
Granted (in shares) 0   170,302    
Performance Based Restricted Stock Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     3 years    
Granted (in shares)     48,848   55,575
Awards distributed (in shares)     15,294    
Fair value of awards distributed     $ 424,000    
Key Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock incentive plan, vesting per year     100.00%    
Award vesting period     1 year    
CNB Financial Corporation 2025 Omnibus Incentive Plan (the “2025 Stock Incentive Plan”)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized for issuance (shares) 782,246   782,246    
CNB Financial Corporation 2025 Omnibus Incentive Plan (the “2025 Stock Incentive Plan”) | Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock incentive plan, vesting per year     33.00%    
CNB Financial Corporation 2025 Omnibus Incentive Plan (the “2025 Stock Incentive Plan”) | Tranche Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock incentive plan, vesting per year     25.00%