DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Cumulative Basis Adjustment for Fair Value Hedges (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
AFS debt securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amortized Cost	$ 22,500	$ 22,500
Cumulative Amount of Fair Value Hedging Adjustment to Hedged Items	202	941
Deposits
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amortized Cost	1,614,617	300,000
Cumulative Amount of Fair Value Hedging Adjustment to Hedged Items	22,191	1,432
FHLB advances
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amortized Cost	1,200,000	700,000
Cumulative Amount of Fair Value Hedging Adjustment to Hedged Items	$ 12,229	$ 3,206