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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Derivative [Line Items]    
Derivative asset, statement of financial position [extensible enumeration] Other assets Other assets
Derivative liability, statement of financial position [extensible enumeration] Other liabilities Other liabilities
Notional amount $ 15,349,000,000 $ 15,924,000,000
Additional amount in excess of posted collateral required in case of breached agreements $ 100,000 200,000
Interest rate contracts    
Derivative [Line Items]    
Maximum length of time hedged in interest rate cash flow hedge 4 years  
Period to reclassification of cash flow hedge gain loss 12 months  
Derivative gain to be reclassified within twelve months $ 5,600,000  
Derivative gain to be reclassified within twelve months, net of tax 4,400,000  
Derivative gain or losses excluded from assessment of hedge effectiveness 0  
Amount of gain (loss) reclassified from AOCI into net income $ 0 0
Interest rate lock commitments | Minimum    
Derivative [Line Items]    
Lock in period for interest rates 30 days  
Interest rate lock commitments | Maximum    
Derivative [Line Items]    
Lock in period for interest rates 360 days  
Credit risk contracts    
Derivative [Line Items]    
Notional amount $ 604,000,000  
Maximum exposure under credit risk agreement assuming customer default 0 0
Credit risk derivatives, purchased at fair value 100,000 100,000
Credit risk derivatives, sold at fair value $ 100,000 $ 0
Credit risk contracts | Minimum    
Derivative [Line Items]    
Risk participation agreements, term 3 months  
Credit risk contracts | Maximum    
Derivative [Line Items]    
Risk participation agreements, term 15 years