Premises and Equipment and Leases - Summary of Premises and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 24,199	$ 22,629
Accumulated depreciation	(12,058)	(10,258)
Property plant and equipment net	12,141	12,371
Construction in progress
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	286	2,097
Land and land improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	33	33
Buildings
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	150	150
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	11,720	9,487
Furniture, fixtures, and equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	8,075	7,133
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	3,906	3,700
Automobiles
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 29	$ 29