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Derivative Instruments and Hedging Activities - Cumulative Basis Adjustment for Fair Value Hedges (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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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 | 764 | 941
Deposits |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Amortized Cost | 300,000 | 300,000
Unamortized basis adjustments from interest rate swaps designated as fair value hedges of long-term advances from FHLB | 1,079 | 1,432
FHLB advances |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Amortized Cost | 700,000 | 700,000
Unamortized basis adjustments from interest rate swaps designated as fair value hedges of long-term advances from FHLB | $ (4,912) | $ 3,206

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