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Subsequent Events - Additional Information (Detail) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 17, 2021 $ / shares | Jan. 31, 2021 USD ($) shares | Jan. 07, 2021 $ / shares | Dec. 15, 2019 USD ($) shares | Dec. 31, 2020 $ / shares shares | Dec. 31, 2019 $ / shares shares
Subsequent Event [Line Items] |  |  |  |  |  |
Common stock dividends per share cash paid | $ / shares |  |  |  |  | $ 0.4275 | $ 0.57
Common stock shares received by shareholders |  |  |  | 3.05 |  |
Common stock, shares, issued |  |  |  |  | 5,718,621 | 5,658,585
Cash paid in lieu of fractional shares to common shareholders | $ |  |  |  | $ 16,646,000 |  |
Subsequent Event [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Quarterly cash dividend, declared date | Mar. 17, 2021 |  | Jan. 07, 2021 |  |  |
Common stock dividends per share cash paid | $ / shares |  |  | $ 0.1425 |  |  |
Dividend, payment date | Apr. 30, 2021 |  | Jan. 29, 2021 |  |  |
Dividend, record date | Apr. 20, 2021 |  | Jan. 19, 2021 |  |  |
Stock split, conversion ratio | 1.5 |  |  |  |  |
Stock split, description | On March 17, 2021, the Company announced that its board of directors had approved and declared a three-for-two stock split effected in the form of a 50% stock dividend on its common stock outstanding payable on April 30, 2021 to shareholders of record as of April 20, 2021 |  |  |  |  |
Percentage of stock dividend payable on stock split of common stock. | 50.00% |  |  |  |  |
Quarterly cash dividend per common share, declared | $ / shares | $ 0.15 |  |  |  |  |
Bay Banks [Member] | Subsequent Event [Member] |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Common stock shares received by shareholders |  | 0.5000 |  |  |  |
Common stock, shares, issued |  | 6,627,558 |  |  |  |
fair value of consideration transferred | $ |  | $ 124,800,000 |  |  |  |
Cash paid in lieu of fractional shares to common shareholders | $ |  | $ 3,400 |  |  |  |
Option to purchase additional shares |  | 198,362 |  |  |  |
Options to acquire shares of common. |  | 99,176 |  |  |  |
Estimated fair value of common stock | $ |  | $ 472,000 |  |  |  |

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