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Securities Held-to-Maturity - Schedule of Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Schedule of Held-to-maturity Securities [Line Items] |  |
Debt instruments: Pass-through GSEs (amortized cost) | $ 245 | $ 259
Pass-through GSEs [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt instruments: Pass-through GSEs (amortized cost) | $ 245 | $ 259

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