Segment Reporting - Segment Information (Additional Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Goodwill	$ 142,685	$ 137,823	$ 0
Operating segments | Global Commercial Bank
Segment Reporting Information [Line Items]
Depreciation and amortization	25,300	$ 20,400	$ 21,800
Operating segments | SVB Leerink
Segment Reporting Information [Line Items]
Goodwill	$ 137,800