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Investment Securities Available for Sale (Amortized Cost And Estimated Fair Value By Contractual Maturity Of Investment Securities Available For Sale) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Amortized Cost    
Amortized Cost, Within One year $ 24,847  
Amortized Cost, 1 to 5 Years 118,760  
Amortized Cost, 5 to 10 Years 306,105  
Amortized Cost, More Than 10 years 7,352,152  
Amortized Cost 7,801,864 $ 6,647,791
Fair Value    
Fair Value, Within One year 24,870  
Fair Value, 1 to 5 Years 122,940  
Fair Value, 5 to 10 Years 318,539  
Fair Value, More Than 10 years 7,496,089  
Total Fair Value 7,962,438 6,778,670
U.S. Treasury securities    
Amortized Cost    
Amortized Cost, Within One year 20,257  
Amortized Cost, 1 to 5 Years 0  
Amortized Cost, 5 to 10 Years 0  
Amortized Cost, More Than 10 years 0  
Amortized Cost 20,257 19,855
Fair Value    
Fair Value, Within One year 20,257  
Fair Value, 1 to 5 Years 0  
Fair Value, 5 to 10 Years 0  
Fair Value, More Than 10 years 0  
Total Fair Value 20,257 19,855
U.S. Government agency securities    
Amortized Cost    
Amortized Cost, Within One year 430  
Amortized Cost, 1 to 5 Years 2,085  
Amortized Cost, 5 to 10 Years 77,123  
Amortized Cost, More Than 10 years 0  
Amortized Cost 79,638 35,499
Fair Value    
Fair Value, Within One year 432  
Fair Value, 1 to 5 Years 2,112  
Fair Value, 5 to 10 Years 79,776  
Fair Value, More Than 10 years 0  
Total Fair Value 82,320 36,541
Mortgage-backed securities issued by U.S. Government agencies    
Amortized Cost    
Amortized Cost, Within One year 0  
Amortized Cost, 1 to 5 Years 1,390  
Amortized Cost, 5 to 10 Years 232  
Amortized Cost, More Than 10 years 1,214,390  
Amortized Cost 1,216,012 56,328
Fair Value    
Fair Value, Within One year 0  
Fair Value, 1 to 5 Years 1,442  
Fair Value, 5 to 10 Years 242  
Fair Value, More Than 10 years 1,216,333  
Total Fair Value 1,218,017 56,816
Mortgage-backed securities issued by U.S. Government sponsored enterprises    
Amortized Cost    
Amortized Cost, Within One year 0  
Amortized Cost, 1 to 5 Years 231  
Amortized Cost, 5 to 10 Years 83,163  
Amortized Cost, More Than 10 years 4,782,464  
Amortized Cost 4,865,858 5,079,396
Fair Value    
Fair Value, Within One year 0  
Fair Value, 1 to 5 Years 236  
Fair Value, 5 to 10 Years 86,192  
Fair Value, More Than 10 years 4,913,618  
Total Fair Value 5,000,046 5,180,815
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises    
Amortized Cost    
Amortized Cost, Within One year 0  
Amortized Cost, 1 to 5 Years 0  
Amortized Cost, 5 to 10 Years 225  
Amortized Cost, More Than 10 years 1,245,419  
Amortized Cost 1,245,644 629,706
Fair Value    
Fair Value, Within One year 0  
Fair Value, 1 to 5 Years 0  
Fair Value, 5 to 10 Years 235  
Fair Value, More Than 10 years 1,250,142  
Total Fair Value 1,250,377 636,851
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises    
Amortized Cost    
Amortized Cost, Within One year 4,160  
Amortized Cost, 1 to 5 Years 105,549  
Amortized Cost, 5 to 10 Years 136,656  
Amortized Cost, More Than 10 years 107,879  
Amortized Cost 354,244 357,291
Fair Value    
Fair Value, Within One year 4,181  
Fair Value, 1 to 5 Years 109,813  
Fair Value, 5 to 10 Years 142,952  
Fair Value, More Than 10 years 113,975  
Total Fair Value 370,921 371,592
Corporate debt securities and other debt securities    
Amortized Cost    
Amortized Cost, Within One year 0  
Amortized Cost, 1 to 5 Years 9,505  
Amortized Cost, 5 to 10 Years 8,706  
Amortized Cost, More Than 10 years 2,000  
Amortized Cost 20,211 144,410
Fair Value    
Fair Value, Within One year 0  
Fair Value, 1 to 5 Years 9,337  
Fair Value, 5 to 10 Years 9,142  
Fair Value, More Than 10 years 2,021  
Total Fair Value $ 20,500 $ 146,725