Acquisitions - Summary of Rollforward of Restructuring and Integration Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Rollforward of restructuring and integration liabilities
Liability balance, beginning of period	$ 300	$ 1,000
Restructuring and integration costs	9	2,053
Settlement of liabilities	$ (300)	(1,700)
Liability balance, end of period		1,400
USAA AMCO
Rollforward of restructuring and integration liabilities
Integration costs		400
Severance expense | USAA AMCO
Rollforward of restructuring and integration liabilities
Severance expense		1,600
Severance expense | THB Acquisition
Rollforward of restructuring and integration liabilities
Severance expense		$ 100