Goodwill and Other Intangible Assets - Summary of Changes to Carrying Amount of Goodwill by Segment (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Goodwill And Other Intangible Assets [Line Items]
Balance as of December 31, 2019	$ 485,336
Impairment	(443,695)
Balance as of March 31, 2020	43,061
Wealth & Pension Acquisition
Goodwill And Other Intangible Assets [Line Items]
Acquisition and other goodwill	304
Other
Goodwill And Other Intangible Assets [Line Items]
Acquisition and other goodwill	1,116
Banking
Goodwill And Other Intangible Assets [Line Items]
Balance as of December 31, 2019	442,579
Impairment	(443,695)
Banking | Other
Goodwill And Other Intangible Assets [Line Items]
Acquisition and other goodwill	1,116
Financial Services
Goodwill And Other Intangible Assets [Line Items]
Balance as of December 31, 2019	42,757
Balance as of March 31, 2020	43,061
Financial Services | Wealth & Pension Acquisition
Goodwill And Other Intangible Assets [Line Items]
Acquisition and other goodwill	$ 304