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Parent Company Only Financial Statements Parent Company Only Financial Statements, Condensed Balance Sheet Statement (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets [Abstract]        
Cash and cash equivalents $ 1,180,573 $ 1,258,821 $ 1,143,424 $ 2,317,054
Loan to bank subsidiary 22,618,880 21,540,228    
Other assets 907,218 547,995    
Total assets 46,671,088 42,172,021    
Liabilities [Abstract]        
Other liabilities 427,213 372,230    
Subordinated debentures 276,005 275,923    
Total liabilities 41,379,527 37,308,102    
Shareholders' equity: [Abstract]        
Common stock 5 5    
Capital surplus 1,368,062 1,350,995    
Retained earnings 3,973,675 3,729,778    
Treasury Stock, Value (411,344) (329,906)    
Accumulated other comprehensive income (loss) 335,868 104,923 (72,585) (36,174)
Total shareholders’ equity 5,266,266 4,855,795    
Total liabilities and shareholders’ equity 46,671,088 42,172,021    
Parent Company [Member]        
Assets [Abstract]        
Cash and cash equivalents 183,805 214,779 $ 167,093 $ 205,876
Loan to bank subsidiary 65,204 65,220    
Investment in bank subsidiaries 5,079,336 4,602,977    
Investment in non-bank subsidiaries 195,768 216,542    
Other assets 24,338 38,082    
Total assets 5,548,451 5,137,600    
Liabilities [Abstract]        
Other liabilities 6,180 5,882    
Subordinated debentures 276,005 275,923    
Total liabilities 282,185 281,805    
Shareholders' equity: [Abstract]        
Common stock 5 5    
Capital surplus 1,368,062 1,350,995    
Retained earnings 3,973,675 3,729,778    
Treasury Stock, Value (411,344) (329,906)    
Accumulated other comprehensive income (loss) 335,868 104,923    
Total shareholders’ equity 5,266,266 4,855,795    
Total liabilities and shareholders’ equity $ 5,548,451 $ 5,137,600