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Fair Value Measurements and Disclosure - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | $ 88,064 | $ 83,402
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 85,845 | 81,341
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 2,219 | 2,061
Fair Value, Recurring [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 88,064 | 83,402
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 85,845 | 81,341
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 2,219 | 2,061
Mortgage-backed securities—U.S. government sponsored enterprises (GSEs) [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 40,043 | 34,915
Mortgage-backed securities—U.S. government sponsored enterprises (GSEs) [Member] | Fair Value, Recurring [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 40,043 | 34,915
Mortgage-backed securities—U.S. government sponsored enterprises (GSEs) [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 40,043 | 34,915
US Government Agencies Debt Securities [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 4,904 | 5,085
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 4,904 | 5,085
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 4,904 | 5,085
US States and Political Subdivisions Debt Securities [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 37,627 | 41,341
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 37,627 | 41,341
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 37,627 | 41,341
Mortgage-Backed Securities, Issued by Private Enterprises [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 2,219 | 2,061
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | Fair Value, Recurring [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 2,219 | 2,061
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 0 | 0
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 2,219 | $ 2,061
Small Business Association (SBA) securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 2,818 |
Small Business Association (SBA) securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 2,818 |
Subordinated Debentures [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 453 |
Subordinated Debentures [Member] | Fair Value, Recurring [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 453 |
Subordinated Debentures [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | $ 453 |

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