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Summary of Significant Accounting Policies - Additional Information (Detail) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) | Sep. 20, 2017 | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Period for federal funds sold outstanding |  |  | 1 day |  |  |  |
Loan non-accrual classification period |  |  | 90 days |  |  |  |
Days to charged consumer loans to the value of the collateral |  |  | 90 days |  |  |  |
Maximum time for re-evaluation (in months) |  |  | 12 months |  |  |  |
Re-evaluation period for real estate |  |  | 2 years |  |  |  |
Amount of fair value of capital over carrying value |  |  |  | $ 57,800,000 |  |  |
Percentage of fair value of capital over carrying value |  |  |  | 26.80% |  |  |
Number of times fair value of capital in excess of carrying value of goodwill description |  |  | over 1.2 times |  |  |  |
Other real estate owned |  |  | $ 71,000 |  | $ 214,000 |  |
Percentage of likelihood of realization of recognized tax benefit, minimum |  |  | 50.00% |  |  |  |
Share stock split ratio |  | 2 |  |  |  |  |
Net effect on total stockholder's equity due to reclassification of tax effects |  |  | $ 249,160,000 |  | $ 230,258,000 | $ 143,287,000 | $ 134,107,000
Amount of reclassification effect |  |  | $ 0 |  |  |  |
ASU 2018-02 [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Reclassification of tax effects from AOCI due to adoption of new Tax Cuts and Job Acts | $ 359,000 |  |  |  |  |  |
ASU 2018-02 [Member] | Reclassification Adjustment [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Net effect on total stockholder's equity due to reclassification of tax effects | $ 0 |  |  |  |  |  |
ASU 2017-04 [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  |  | true |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  |  | Jan. 01, 2020 |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] |  |  | true |  |  |  |
ASU 2018-13 [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  |  | true |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  |  | Jan. 01, 2020 |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] |  |  | true |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Maturity period of cash equivalents |  |  | 3 months |  |  |  |

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