Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Goodwill And Other Intangible Assets [Line Items]
Interim goodwill impairment	$ 443,695
Goodwill	43,061	$ 485,336
State Bank Acquisition
Goodwill And Other Intangible Assets [Line Items]
Increased in goodwill related to acquisition	1,100
Wealth & Pension Services Group, Inc.
Goodwill And Other Intangible Assets [Line Items]
Increased in goodwill related to acquisition	$ 300