Premises and Equipment - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Depreciation and amortization	$ 652	$ 567	$ 1,878	$ 1,626
Property, plant and equipment, gross	55,738		55,738		$ 55,376
Leasehold Improvements
Property Plant And Equipment [Line Items]
Increase (decrease) in property, plant and equipment			295
Property, plant and equipment, gross	25,829		25,829		25,534
Building Improvements
Property Plant And Equipment [Line Items]
Increase (decrease) in property, plant and equipment			477
Property, plant and equipment, gross	16,873		16,873		17,350
Furniture, Fixtures and Equipment
Property Plant And Equipment [Line Items]
Increase (decrease) in property, plant and equipment			626
Property, plant and equipment, gross	9,139		9,139		8,513
Land
Property Plant And Equipment [Line Items]
Increase (decrease) in property, plant and equipment			82
Property, plant and equipment, gross	$ 3,897		$ 3,897		$ 3,979