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Condensed Financial Statements of Parent Company - Condensed Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets:        
Other Assets. $ 438,827 $ 344,269    
Total assets 41,960,032 37,789,873    
Corporate and subordinated debentures 327,066 390,179    
Other Liabilities. 553,311 430,054    
Shareholders' equity 4,802,940 4,647,880 $ 2,373,013 $ 2,366,296
Total liabilities and shareholders' equity 41,960,032 37,789,873    
Parent company | Reportable Legal Entities        
Assets:        
Cash 81,051 131,522    
Investment in subsidiaries 5,039,776 4,802,993    
Other Assets. 10,556 108,086    
Total assets 5,131,383 5,042,601    
Corporate and subordinated debentures 327,066 390,179    
Other Liabilities. 1,377 4,542    
Shareholders' equity 4,802,940 4,647,880    
Total liabilities and shareholders' equity $ 5,131,383 $ 5,042,601