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Investment Securities - Summary of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities Available for Sale (Detail) - USD ($) | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
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Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |  |  |  |  |
Amortized Cost | $ 175,857,000 |  | $ 153,102,000 |  |  |
Gross Unrealized Gains | 746,000 |  | 167,000 |  |  |
Gross Unrealized Losses | (7,034,000) |  | (7,679,000) |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 169,569,000 |  | 145,590,000 |  |  |
Held-to-Maturity, Amortized Cost | 27,284,000 |  | 31,967,000 |  |  |
Gross Unrecognized Gain | 6,000 |  | 6,000 |  |  |
Gross Unrecognized Losses | (1,186,000) |  | (1,689,000) |  |  |
Held-to-maturity, Fair value | 26,104,000 |  | 30,284,000 |  |  |
Allowance for Credit Losses | (475,000) |  | (459,000) |  |  |
US Government Agency securities [Member] |  |  |  |  |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |  |  |  |  |
Amortized Cost | 13,177,000 |  | 13,017,000 |  |  |
Gross Unrealized Gains | 186,000 |  | 96,000 |  |  |
Gross Unrealized Losses | (18,000) |  | (40,000) |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 13,345,000 |  | 13,073,000 |  |  |
Obligations of state and political subdivisions [Member] |  |  |  |  |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |  |  |  |  |
Amortized Cost | 50,758,000 |  | 51,254,000 |  |  |
Gross Unrealized Gains | 16,000 |  | 10,000 |  |  |
Gross Unrealized Losses | (4,455,000) |  | (4,063,000) |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 46,319,000 |  | 47,201,000 |  |  |
Mortgage-backed securities in government-sponsored entities [Member] |  |  |  |  |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |  |  |  |  |
Amortized Cost | 111,564,000 |  | 88,289,000 |  |  |
Gross Unrealized Gains | 544,000 |  | 61,000 |  |  |
Gross Unrealized Losses | (2,554,000) |  | (3,567,000) |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 109,554,000 |  | 84,783,000 |  |  |
Other securities [Member] |  |  |  |  |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |  |  |  |  |
Amortized Cost | 358,000 |  | 542,000 |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross Unrealized Losses | (7,000) |  | (9,000) |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Fair Value | 351,000 |  | 533,000 |  |  |
Corporate Debentures [Member] |  |  |  |  |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |  |  |  |  |
Held-to-Maturity, Amortized Cost | 12,250,000 |  | 15,250,000 |  |  |
Gross Unrecognized Gain | 0 |  | 0 |  |  |
Gross Unrecognized Losses | (728,000) |  | (984,000) |  |  |
Held-to-maturity, Fair value | 11,522,000 |  | 14,266,000 |  |  |
Allowance for Credit Losses | (475,000) | $ (421,000) | (459,000) | $ (502,000) | $ (507,000) | $ (512,000)
Structured Mortgage-backed Securities [Member] |  |  |  |  |  |
Debt Securities Available For Sale Reconciliation Of Fair Value To Amortized Cost [Line Items] |  |  |  |  |  |
Held-to-Maturity, Amortized Cost | 15,034,000 |  | 16,717,000 |  |  |
Gross Unrecognized Gain | 6,000 |  | 6,000 |  |  |
Gross Unrecognized Losses | (458,000) |  | (705,000) |  |  |
Held-to-maturity, Fair value | 14,582,000 |  | 16,018,000 |  |  |
Allowance for Credit Losses | $ 0 |  | $ 0 |  |  |

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