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Investment Securities Available for Sale (Schedule Of Unrealized Loss On Investments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value $ 230,520 $ 1,995,846
Less than 12 Months, Gross Unrealized Losses (2,118) (20,560)
12 Months or Longer, Fair Value 3,259,401 1,445,859
12 Months or Longer, Gross Unrealized Losses (98,437) (36,717)
Total Fair Value 3,489,921 3,441,705
Total Gross Unrealized Losses (100,555) (57,277)
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 39,031 34,243
Less than 12 Months, Gross Unrealized Losses (118) (443)
12 Months or Longer, Fair Value 63,570 29,562
12 Months or Longer, Gross Unrealized Losses (1,241) (491)
Total Fair Value 102,601 63,805
Total Gross Unrealized Losses (1,359) (934)
Mortgage-backed securities issued by U.S. Government agencies    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 2,059 36,810
Less than 12 Months, Gross Unrealized Losses (2) (357)
12 Months or Longer, Fair Value 79,736 55,740
12 Months or Longer, Gross Unrealized Losses (3,025) (1,005)
Total Fair Value 81,795 92,550
Total Gross Unrealized Losses (3,027) (1,362)
Mortgage-backed securities issued by U.S. Government sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 130,432 1,238,464
Less than 12 Months, Gross Unrealized Losses (700) (10,014)
12 Months or Longer, Fair Value 2,105,358 929,223
12 Months or Longer, Gross Unrealized Losses (63,129) (21,091)
Total Fair Value 2,235,790 2,167,687
Total Gross Unrealized Losses (63,829) (31,105)
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 0 653,781
Less than 12 Months, Gross Unrealized Losses 0 (9,497)
12 Months or Longer, Fair Value 964,732 426,237
12 Months or Longer, Gross Unrealized Losses (29,885) (13,907)
Total Fair Value 964,732 1,080,018
Total Gross Unrealized Losses (29,885) (23,404)
Commercial mortgage-backed securities issued by U.S. Government sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 58,998 32,548
Less than 12 Months, Gross Unrealized Losses (1,298) (249)
12 Months or Longer, Fair Value 44,220 0
12 Months or Longer, Gross Unrealized Losses (942) 0
Total Fair Value 103,218 32,548
Total Gross Unrealized Losses (2,240) (249)
Corporate debt and other debt securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 0 0
Less than 12 Months, Gross Unrealized Losses 0 0
12 Months or Longer, Fair Value 1,785 5,097
12 Months or Longer, Gross Unrealized Losses (215) (223)
Total Fair Value 1,785 5,097
Total Gross Unrealized Losses $ (215) $ (223)