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Investment Securities - Summary of Securities Available For Sale By Contractual Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items] |  |
Amortized cost | $ 104,309 | $ 94,997
Fair value due in one year or less | 13,230 | 52,026
Fair value due after one year through five years | 65,958 | 25,574
Fair value | 88,064 | 83,402
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 | 0 |
Amortized cost due after one year through five years | 7,951 |
Amortized cost due after five years through ten years | 25,038 |
Amortized cost due after ten years | 17,787 |
Amortized cost | 104,309 |
Fair value due in one year or less | 0 |
Fair value due after one year through five years | 7,607 |
Fair value due after five years through ten years | 21,381 |
Fair value due after ten years | 13,996 |
Fair value | 88,064 |
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 | 47,917 | 41,515
Fair value due in one year or less | 4,695 | 15,605
Fair value due after one year through five years | 30,434 | 19,137
Fair value | 40,043 | 34,915
Mortgage-backed securities—U.S. government sponsored enterprises (GSEs) [Member] | Prepayment of Obligation [Member] |  |
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items] |  |
Amortized cost | 47,917 |
Fair value | 40,043 |
Small business association (SBA) securities [Member] |  |
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items] |  |
Amortized cost | 2,817 |
Fair value due in one year or less | 778 |
Fair value due after one year through five years | 0 |
Fair value | 2,818 |
Small business association (SBA) securities [Member] | Prepayment of Obligation [Member] |  |
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items] |  |
Amortized cost | 2,817 |
Fair value | 2,818 |
SBIC securities [Member] |  |
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items] |  |
Amortized cost | 2,799 | 2,061
Fair value due in one year or less | 0 |
Fair value due after one year through five years | 2,219 |
Fair value | 2,219 | $ 2,061
SBIC securities [Member] | Prepayment of Obligation [Member] |  |
Available For Sale Securities Amortized Cost and Debt Maturities Fair Value [Line Items] |  |
Amortized cost | 2,799 |
Fair value | $ 2,219 |

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