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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Jan. 31, 2021	Mar. 31, 2021	Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Non-cash equity compensation		$ 167	$ 79
Restricted stock awards outstanding		115,617
Unrecognized compensation expense		$ 1,400
Share-based compensation arrangement by share-based payment award, converted options to purchase common stock	198,362
Share-based compensation arrangement by share-based payment award options to acquire common stock	99,176
Options to acquire shares of common stock on post stock split basis	148,764
Estimated fair value	$ 472
Stock option exercises, Shares		44,688
Stock options outstanding		54,488
Bay Banks [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options to acquire shares of common stock on post stock split basis	148,764
Weighted-average exercise price per stock option	$ 14.83
Remaining contractual life (in years)	5 years 5 months 19 days
Post Stock Split basis [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock awards outstanding		173,425
Stock option exercises, Shares		67,031
Stock options outstanding		81,732
Post Stock Split basis [Member] | Bay Banks [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average exercise price per stock option	$ 9.89

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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