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Condensed Financial Statements of Parent Company - Condensed Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets:        
Other Assets $ 344,269 $ 160,869    
Total assets 37,789,873 15,921,881    
Corporate and subordinated debentures 390,179 115,833    
Other Liabilities 430,054 225,487    
Shareholders' equity 4,647,880 2,373,013 $ 2,366,296 $ 2,308,920
Total liabilities and shareholders' equity 37,789,873 15,921,881    
Parent company | Reportable Legal Entities        
Assets:        
Cash 131,522 21,688    
Investment in subsidiaries 4,802,993 2,467,466    
Other Assets 108,086 204    
Total assets 5,042,601 2,482,982    
Corporate and subordinated debentures 390,179 115,833    
Other Liabilities 4,542 512    
Shareholders' equity 4,647,880 2,373,013    
Total liabilities and shareholders' equity $ 5,042,601 $ 2,482,982