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Acquisitions - Narrative (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 01, 2018
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]      
Goodwill   $ 808,322 $ 808,726
Grandpoint Capital, Inc.      
Business Acquisition [Line Items]      
Total assets acquired $ 3,051,567 3,076,224  
Gross loans acquired 2,400,000    
Total deposits acquired $ 2,506,663 2,506,929  
Equity issued, ratio 0.4750    
Consideration paid $ 602,152    
Aggregate cash consideration payable $ 28,100    
Company's common stock value (usd per share) | $ / shares $ 38.15    
Goodwill $ 312,600 312,639  
Net adjustment to loans, deferred tax assets and other assets since acquisition   $ 580  
Grandpoint Capital, Inc. | Common Stock      
Business Acquisition [Line Items]      
Common stock issued as consideration (in shares) | shares 15,758,089