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Derivative Instruments and Hedging Activities - Cumulative Basis Adjustment for Fair Value Hedges (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
AFS debt securities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Amortized Cost | $ 22,500 | $ 22,500
Unamortized basis adjustments from interest rate swaps designated as fair value hedges of long-term advances from FHLB | (1,331) | 1,777
Deposits |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Amortized Cost | 300,000 | 0
Unamortized basis adjustments from interest rate swaps designated as fair value hedges of long-term advances from FHLB | 1,787 | 0
FHLB advances |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Amortized Cost | 700,000 | 0
Unamortized basis adjustments from interest rate swaps designated as fair value hedges of long-term advances from FHLB | $ (10,160) | $ 0

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