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Basis of Presentation and Summary of Significant Accounting Policies (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
segment
affiliate
market
Jun. 30, 2018
USD ($)
Dec. 31, 2017
segment
Jan. 01, 2019
USD ($)
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Number of reportable segments | segment 3   4  
Purchases, adjustment, securities available for sale $ 9,845 $ 9,985    
Sales, adjustment, securities available for sale 0 24    
Lease liabilities 126,740      
ROU assets $ 110,880      
Private Banking        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Number of geographic markets | market 3      
Affiliate Partners        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Number of consolidated entities | affiliate 4      
ASU 2016-02        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Lease liabilities       $ 124,000
ROU assets       $ 108,000
Restatement Adjustment        
Basis Of Presentation And Significant Accounting Policies [Line Items]        
Purchases, adjustment, securities available for sale   (22,700)    
Sales, adjustment, securities available for sale   $ (35,500)