DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Derivative [Line Items]
Notional amount	$ 15,488,000,000		$ 15,924,000,000
Additional amount in excess of posted collateral required in case of breached agreements	$ 900,000		200,000
Interest rate contracts
Derivative [Line Items]
Maximum length of time hedged in interest rate cash flow hedge	4 years 3 months 18 days
Period to reclassification of cash flow hedge gain loss	12 months
Derivative gain to be reclassified within twelve months	$ 3,200,000
Derivative gain to be reclassified within twelve months, net of tax	2,500,000
Derivative gain or losses excluded from assessment of hedge effectiveness	0
Amount of gain (loss) reclassified from AOCI into net income	0	$ 0
Credit risk contracts
Derivative [Line Items]
Notional amount	623,000,000
Maximum exposure under credit risk agreement assuming customer default	0		0
Credit risk derivatives, purchased at fair value	200,000		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	16 years