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Fair Value Measurements and Disclosures - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | $ 209,928 | $ 247,171
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 2,929 | 4,389
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 206,999 | 242,782
Mortgage-backed securities - U.S. government sponsored enterprise (GSEs) [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 155,266 | 190,545
Mortgage-backed securities - U.S. government sponsored enterprise (GSEs) [Member] | Fair Value, Recurring [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 155,266 | 190,545
Mortgage-backed securities - U.S. government sponsored enterprise (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 | 155,266 | 190,545
Mortgage-backed securities - U.S. government sponsored enterprise (GSEs) [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 | 0 | 0
US Government Agencies Debt Securities [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 10,469 | 10,200
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 | 10,469 | 10,200
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value |  | 0
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 | 10,469 | 10,200
US Government Agencies Debt Securities [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 | 0 | 0
US States and Political Subdivisions Debt Securities [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 39,918 | 39,730
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 | 39,918 | 39,730
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 | 39,918 | 39,730
US States and Political Subdivisions Debt Securities [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 | 0 | 0
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 | 1,346 | 1,857
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 | 1,346 | 1,857
Small Business Association (SBA) securities [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 | 0 | 0
U.S. treasury securities [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 2,929 | 4,839
U.S. treasury securities [Member] | Fair Value, Recurring [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 2,929 | 4,839
U.S. treasury securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 2,929 | 4,839
U.S. treasury 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 | 0 | 0
U.S. treasury securities [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 | 0 | 0
Mortgage Servicings Rights [Member] | Fair Value, Recurring [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 707 | 1,060
Mortgage Servicings Rights [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value Assets Measured On Recurring Basis [Line Items] |  |
Securities available-for-sale, at fair value | 0 | 0
Mortgage Servicings Rights [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 | 707 | 1,060
Mortgage Servicings Rights [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 | $ 0 | $ 0

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