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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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