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Parent Company Only Financial Statements Parent Company Only Financial Statements, Condensed Balance Sheet Statement (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Assets [Abstract]        
Loan to bank subsidiary $ 22,321,446 $ 19,949,259    
Other assets 1,354,379 957,951    
Total assets 47,790,642 50,249,431    
Liabilities [Abstract]        
Other liabilities 484,849 435,221    
Subordinated debentures 131,205 131,226    
Total liabilities 43,103,284 44,881,060    
Shareholders' equity: [Abstract]        
Common stock 5 5    
Capital surplus 1,390,395 1,378,794    
Retained earnings 4,824,164 4,447,691    
Treasury Stock, Value (694,960) (535,129)    
Accumulated other comprehensive income (loss) (836,955) 72,371 $ 335,868 $ 104,923
Total shareholders’ equity 4,682,649 5,363,732    
Total liabilities and shareholders’ equity 47,790,642 50,249,431    
Parent Company [Member]        
Assets [Abstract]        
Cash and cash equivalents 165,395 230,647    
Loan to bank subsidiary 65,169 65,187    
Investment in bank subsidiary 4,351,280 4,951,405    
Investment in non-bank subsidiaries 217,011 228,447    
Other assets 18,302 22,011    
Total assets 4,817,157 5,497,697    
Liabilities [Abstract]        
Other liabilities 3,303 2,739    
Subordinated debentures 131,205 131,226    
Total liabilities 134,508 133,965    
Shareholders' equity: [Abstract]        
Common stock 5 5    
Capital surplus 1,390,395 1,378,794    
Retained earnings 4,824,164 4,447,691    
Treasury Stock, Value (694,960) (535,129)    
Accumulated other comprehensive income (loss) (836,955) 72,371    
Total shareholders’ equity 4,682,649 5,363,732    
Total liabilities and shareholders’ equity $ 4,817,157 $ 5,497,697