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Summary of Significant Accounting Policies - Additional Information (Detail) |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2020 USD ($) | Dec. 31, 2022 USD ($) Branch Segment shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | 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 |  | $ 2,400,000 | $ 1,900,000 |  |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] |  | Accrued interest | Accrued interest |  |
Increase to beginning balance of allowance for credit losses | $ 17,400,000 |  |  |  |
Decrease to beginning balance of allowance for off balance sheet items | 335,000 |  |  |  |
Retained earnings |  | $ 269,542,000 | $ 196,784,000 |  |
Impairment of intangible assets |  | 0 |  |  |
Goodwill impairment loss |  | 0 |  |  |
Bank-owned life insurance |  | $ 55,544,000 | 54,905,000 |  |
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 |  | 0 |  |  |
Shares repurchased |  |  | $ 6,135,000 | $ 2,196,000 |
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 |  | $ 3,000,000.0 |  |  |
Cumulative Effect Period of Adoption Adjustment | Impact of ASU 2016-13 Adoption |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Retained earnings | $ 12,200,000 |  |  |  |
Full Service |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Number of branches | Branch |  | 35 |  |  |
Loan Production |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Number of branches | Branch |  | 8 |  |  |

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