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Business Combinations - Additional Information (Detail) - USD ($)		1 Months Ended	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Common Stock Shares Issued			18,774,082	8,577,932
Options To Acquire Shares Of Common Stock On Post Stock Split Basis		148,758
Settlement of net debt				$ 349,000
Goodwill			26,826,000	19,620,000
Fair Value Adjustment Of Subordinated Notes			0
Bay Banks Of Virginia Inc [Member]
Business Acquisition [Line Items]
Cash per share received by share holders	$ 12.55	$ 12.55
Common stock shares received by shareholders	0.5000
Common Stock Shares Issued	6,634,495	6,634,495
Business acquisition, common stock issued post stock split basis	9,951,743
fair value of consideration transferred	$ 124,900,000
Cash in lieu of fractional shares	$ 3,400
Option To Purchase Additional Shares	198,362
Options To Acquire Shares Of Common	99,176
Options To Acquire Shares Of Common Stock On Post Stock Split Basis	148,764
Estimated fair value of common stock	$ 472,000
Settlement of net debt	650,000
Goodwill	7,206,000	$ 7,206,000
Merger-related expense			$ 11,900,000	$ 2,400,000
Bay Banks Of Virginia Inc [Member] | Subordinated Debt [Member]
Business Acquisition [Line Items]
Acquired subordinated notes	1,750,000
Bay Banks Of Virginia Inc [Member] | Subordinated Debt One [Member]
Business Acquisition [Line Items]
Acquired subordinated notes	$ 1,100,000
Core Deposits [Member]
Business Acquisition [Line Items]
Amortized over an estimated useful life			10 years

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