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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Cumulative Basis Adjustment for Fair Value Hedges (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
AFS debt securities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Amortized Cost | $ 0 | $ 10,000
Cumulative Amount of Fair Value Hedging Adjustment to Hedged Items | 0 | 0
Deposits |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Amortized Cost | 1,697,282 | 1,794,923
Cumulative Amount of Fair Value Hedging Adjustment to Hedged Items | 22,495 | (6,042)
FHLB advances |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Amortized Cost | 750,000 | 1,200,000
Cumulative Amount of Fair Value Hedging Adjustment to Hedged Items | $ 5,437 | $ (1,648)

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