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Investment Securities - Summary of Securities Available For Sale By Contractual Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items] |  |
Amortized cost | $ 217,793 | $ 259,658
Fair value due in one year or less | 38,327 | 129,849
Fair value due after one year through five years | 64,711 | 69,181
Fair value | 209,928 | 247,171
Prepayment of Obligation [Member] |  |
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items] |  |
Amortized cost due in one year or less | 2,554 |
Amortized cost due after one year through five years | 10,849 |
Amortized cost due after five years through ten years | 41,234 |
Amortized cost due after ten years | 3,337 |
Amortized cost | 217,793 |
Fair value due in one year or less | 2,555 |
Fair value due after one year through five years | 10,776 |
Fair value due after five years through ten years | 38,397 |
Fair value due after ten years | 2,934 |
Fair value | 209,928 |
Mortgage-backed securities - U.S. Government Sponsored Enterprises (GSEs) [Member] |  |
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items] |  |
Amortized cost | 159,819 | 197,792
Fair value due in one year or less | 31,883 | 122,763
Fair value due after one year through five years | 27,639 | 29,229
Fair value | $ 155,266 | $ 190,545

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