Acquisitions - Acquisition-related costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Acquisitions        
Acquisition related costs $ 2,787 $ (5) $ 5,564 $ (5)
USAA Asset Management and USAA Shareholder Account Services        
Acquisitions        
Acquisition related costs 2,222   4,808  
Harvest        
Acquisitions        
Acquisition related costs 553   744  
Other        
Acquisitions        
Acquisition related costs $ 12 $ (5) $ 12 $ (5)