Premises and Equipment - Schedule of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Total cost	$ 12,778	$ 12,159
Accumulated depreciation	(8,234)	(6,933)
Net book value	4,544	5,226
Leasehold Improvements
Property Plant And Equipment [Line Items]
Total cost	6,878	6,571
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Total cost	3,307	3,174
Equipment and Others
Property Plant And Equipment [Line Items]
Total cost	$ 2,593	$ 2,414