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Derivative Instruments and Hedging Activities - Cumulative Basis Adjustment for Fair Value Hedges (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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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 | 941 | 1,777
Deposits |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Amortized Cost | 300,000 | 0
Cumulative Amount of Fair Value Hedging Adjustment to Hedged Items | 1,432 | 0
FHLB advances |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Amortized Cost | 700,000 | 0
Cumulative Amount of Fair Value Hedging Adjustment to Hedged Items | $ 3,206 | $ 0

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