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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Effect of Derivative Financial Instruments on Net Income and Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivatives designated as fair value hedges: | Fair Value Hedging        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Income (Loss) Recognized in Earnings $ 151 $ 0 $ 487 $ 0
Derivatives designated as fair value hedges: | Interest rate swaps | Fair Value Hedging        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Income (Loss) Recognized in Earnings (2,245) 42,717 (6,535) 54,453
Derivatives designated as fair value hedges: | AFS debt securities | Fair Value Hedging        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Income (Loss) Recognized in Earnings 0 (306) 0 (739)
Derivatives designated as fair value hedges: | Deposits | Fair Value Hedging        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Income (Loss) Recognized in Earnings 1,452 (23,444) 4,188 (25,130)
Derivatives designated as fair value hedges: | FHLB advances | Fair Value Hedging        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Income (Loss) Recognized in Earnings 944 (18,967) 2,834 (28,584)
Derivatives not designated as hedging instruments: | Interest rate swaps, caps and collars        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Income (Loss) Recognized in Earnings $ 340 $ 374 $ (2,011) $ 1,109