Segment Information - Summary of Segment Information (Detail) - USD ($)		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net interest income		$ 5,091,000	$ 4,425,000
Provision (credit) for loan losses		(213,000)	724,000
Net interest income after provision (credit) for loan losses		5,304,000	3,701,000
Non-interest income:
Customer service fees		367,000	306,000
Gain on loan origination and sale activities, net	[1]	11,674,000	7,472,000
Mortgage servicing fees, net		779,000	(1,254,000)
Other		284,000	255,000
Total non-interest income		13,104,000	6,779,000
Non-interest expenses:
Salaries and employee benefits		8,437,000	8,126,000
Occupancy and equipment		744,000	698,000
Other non-interest expenses		2,770,000	2,135,000
Total non-interest expenses		11,951,000	10,959,000
Income before income taxes and elimination of inter-segment profit		6,457,000	(479,000)
Elimination of inter-segment profit		(681,000)	(328,000)
Income (loss) before income taxes		5,776,000	(807,000)
Income tax expense		1,664,000	11,000
Net income (loss)		4,112,000	(818,000)
Total assets		738,188,000	652,886,000	$ 721,072,000
Envision Bank [Member]
Segment Reporting Information [Line Items]
Net interest income		4,201,000	3,994,000
Provision (credit) for loan losses		(213,000)	724,000
Net interest income after provision (credit) for loan losses		4,414,000	3,270,000
Non-interest income:
Customer service fees		340,000	273,000
Mortgage servicing fees, net		(94,000)	(87,000)
Other		151,000	140,000
Total non-interest income		397,000	326,000
Non-interest expenses:
Salaries and employee benefits		1,802,000	3,098,000
Occupancy and equipment		443,000	404,000
Other non-interest expenses		1,087,000	1,146,000
Total non-interest expenses		3,332,000	4,648,000
Income before income taxes and elimination of inter-segment profit		1,479,000	(1,052,000)
Total assets		581,954,000	543,586,000
Envision Mortgage [Member]
Segment Reporting Information [Line Items]
Net interest income		890,000	431,000
Net interest income after provision (credit) for loan losses		890,000	431,000
Non-interest income:
Customer service fees		27,000	33,000
Gain on loan origination and sale activities, net	[1]	11,674,000	7,472,000
Mortgage servicing fees, net		873,000	(1,167,000)
Other		133,000	115,000
Total non-interest income		12,707,000	6,453,000
Non-interest expenses:
Salaries and employee benefits		6,635,000	5,028,000
Occupancy and equipment		301,000	294,000
Other non-interest expenses		1,683,000	989,000
Total non-interest expenses		8,619,000	6,311,000
Income before income taxes and elimination of inter-segment profit		4,978,000	573,000
Total assets		$ 156,234,000	$ 109,300,000

[1] Before elimination of inter-segment profit.