Acquisitions - Additional Information (Detail) - USD ($)		12 Months Ended
	Jan. 01, 2020	Dec. 31, 2022
Commercial Bancshares, Inc [Member]
Business Acquisition [Line Items]
Business acquisition, agreement date		Sep. 19, 2019
Payment for all outstanding shares of acquired entity by shares	6,275,574
Business acquisition, special dividend	$ 1,920,000
TB&T Bancshares, Inc. and The Bank & Trust of Bryan College Station, Texas [Member]
Business Acquisition [Line Items]
Payment for all outstanding shares of acquired entity by shares	6,275,574
Loans	$ 447,702,000
Total loans of contractual amounts	$ 455,181,000