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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) Branch Segment shares | Dec. 31, 2023 USD ($) | Jan. 24, 2019 shares
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Number of reportable segments | Segment | 1 |  |
Accrued interest receivable on available-for-sale debt securities | $ 3,600,000 | $ 3,300,000 |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Accrued interest | Accrued interest |
Retained earnings | $ 350,869,000 | $ 319,048,000 |
Impairment of intangible assets | 0 |  |
Goodwill impairment loss | 0 |  |
Bank-owned life insurance | $ 57,168,000 | 56,335,000 |
Stock options, expiration term from date of grant | 10 years |  |
Number of shares authorized for repurchase (percent) |  |  | 5.00%
Number of shares authorized for repurchase under program (shares) | shares |  |  | 1,500,000
Shares repurchased (shares) | shares | 369,500 |  |
Shares repurchased | $ 6,314,000 | 4,084,000 |
Unrealized loss on sale of debt securities | 0 |  |
Allowance for credit loss on available for sale securities | $ 0 | $ 0 |
Minimum |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Period of continuous service | 3 years |  |
Maximum |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Period of continuous service | 5 years |  |
Split Dollar Death Benefit Agreement |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Bank-owned life insurance | $ 4,300,000 |  |
Full Service |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Number of branches | Branch | 32 |  |
Loan Production |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Number of branches | Branch | 8 |  |

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