DERIVATIVE INSTRUMENTS - Schedule of Effects of Fair Value Hedge Relationships Reported in Interest Income on Securities on Consolidated Statements of Income (Detail) - Interest Rate Swap Aagreements - Securities - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on fair value hedging relationship - Hedged items	$ 13,362	$ 1,118
Gain (loss) on fair value hedging relationship - Derivative designated as hedging instrument	$ (13,362)	$ (1,118)