DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Derivative [Line Items]
Notional amount	$ 9,189,000,000		$ 6,942,000,000
Additional amount in excess of posted collateral required in case of breached agreements	$ 200,000		700,000
Interest rate contracts [Member]
Derivative [Line Items]
Maximum length of time hedged in interest rate cash flow hedge	5 years 2 months 12 days
Period to reclassification of cash flow hedge gain loss	12 months
Derivative gains to be reclassified within twelve months	$ 4,000,000.0
Derivative gains to be reclassified within twelve months, net of tax	3,100,000
Derivative gain or loses excluded from assessment of hedge effectiveness	0
Amount of gain (loss) reclassified from AOCI into net income	0
Gains or losses from cash flow hedge derivatives reclassified to earnings		$ 0
Credit risk contracts - not designated [Member]
Derivative [Line Items]
Notional amount	212,900,000
Maximum exposure under credit risk agreement assuming customer default	400,000		100,000
Credit risk derivatives, purchased at fair value	100,000		50,000.00
Credit risk derivatives, sold at fair value	$ 400,000		$ 110,000
Credit risk contracts - not designated [Member] | Minimum [Member]
Derivative [Line Items]
Risk participation agreements, term	3 months
Credit risk contracts - not designated [Member] | Maximum [Member]
Derivative [Line Items]
Risk participation agreements, term	9 years