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Derivative and Other Hedging Instruments (Effect Of Derivative Instruments Not Designated As Hedges On Comprehensive Income Statement) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Changes in Derivative and Other Hedge Portfolio [Roll Forward]                
Amount Gain/(Loss) Recognized in Income on Derivatives $ (680,000) $ (237,000) $ 763,000 $ (3,417,000)        
Gain (Loss) on Extinguishment of Debt       (146,000)        
Interest Rate Swaption [Member]                
Changes in Derivative and Other Hedge Portfolio [Roll Forward]                
Notional Amount (11,450,000) (9,350,000) (11,450,000) (9,350,000) $ (13,150,000) $ (10,400,000) $ (9,550,000)  
Additions 0 0 (4,250,000) (2,000,000)        
Settlement, Expirations or Exercise 1,700,000 200,000 3,200,000 1,500,000        
Notional Amount (11,450,000)   (11,450,000)          
Amount Gain/(Loss) Recognized in Income on Derivatives (313,000) (14,000) 74,000 (148,000)        
TBA and Forward Settling Agency Securities [Member]                
Changes in Derivative and Other Hedge Portfolio [Roll Forward]                
Notional Amount (26,567,000) (19,760,000) (26,567,000) (19,760,000) (24,518,000) (30,364,000) (20,279,000) $ (7,322,000)
Additions (94,248,000) (75,186,000) (187,584,000) (112,936,000)        
Settlement, Expirations or Exercise       100,498,000        
Amount Gain/(Loss) Recognized in Income on Derivatives 396,000 220,000 (530,000) 913,000        
Purchases Of TBAs And Forward Settling Agency Securities [Member]                
Changes in Derivative and Other Hedge Portfolio [Roll Forward]                
Settlement, Expirations or Exercise 92,199,000 75,705,000 191,381,000          
Interest Rate Swap [Member]                
Changes in Derivative and Other Hedge Portfolio [Roll Forward]                
Additions 0 (25,750,000) (7,000,000) (75,725,000)        
Settlement, Expirations or Exercise 0 30,150,000 500,000 112,725,000        
Notional Amount (49,725,000)   (49,725,000)          
Amount Gain/(Loss) Recognized in Income on Derivatives (400,000) (379,000) 724,000 (3,174,000)        
US Treasury Securities [Member]                
Changes in Derivative and Other Hedge Portfolio [Roll Forward]                
Amount Gain/(Loss) Recognized in Income on Derivatives (29,000) (8,000) 32,000 (112,000)        
Forward Settling non-Agency Securities                
Changes in Derivative and Other Hedge Portfolio [Roll Forward]                
Notional Amount (300,000)   (300,000)   0 0    
Additions (300,000)   (300,000)          
Amount Gain/(Loss) Recognized in Income on Derivatives 0   0          
Purchases Of Forward Settling non-Agency Securities                
Changes in Derivative and Other Hedge Portfolio [Roll Forward]                
Settlement, Expirations or Exercise 0   0          
Not Designated as Hedging Instrument [Member] | Interest Rate Swaption [Member]                
Changes in Derivative and Other Hedge Portfolio [Roll Forward]                
Notional Amount               (8,850,000)
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]                
Changes in Derivative and Other Hedge Portfolio [Roll Forward]                
Notional Amount (49,725,000) (42,075,000) (49,725,000) (42,075,000) (49,725,000) (43,225,000) (46,475,000) (79,075,000)
Short [Member] | US Treasury Securities [Member]                
Changes in Derivative and Other Hedge Portfolio [Roll Forward]                
Notional Amount (10,893,000) (7,247,000) (10,893,000) (7,247,000) (15,527,000) (11,287,000) (4,245,000) (9,224,000)
Additions (585,000) (4,187,000) (7,846,000) (10,232,000)        
Settlement, Expirations or Exercise (5,219,000) (1,185,000) (8,240,000) 12,209,000        
Amount Gain/(Loss) Recognized in Income on Derivatives (333,000) (60,000) 474,000 (997,000)        
Long [Member] | US Treasury Securities [Member]                
Changes in Derivative and Other Hedge Portfolio [Roll Forward]                
Amount Gain/(Loss) Recognized in Income on Derivatives (1,000) 4,000 (11,000) 101,000        
Debt Securities, Trading, and Equity Securities, FV-NI 397,000 1,132,000 397,000 1,132,000 0 0 3,569,000 95,000
Trading Securities Added During the Period 1,336,000 550,000 2,651,000 7,011,000        
Notional Amount Of Trading Securities Settlement Expiration During The Period (939,000) (2,987,000) (2,254,000) (5,974,000)        
Future [Member] | Short [Member] | US Treasury Securities [Member]                
Changes in Derivative and Other Hedge Portfolio [Roll Forward]                
Notional Amount (1,500,000) (1,000,000) (1,500,000) (1,000,000) $ (1,000,000) $ (1,000,000) $ (1,000,000) $ (1,000,000)
Additions 2,000,000 1,000,000 3,000,000 (2,000,000)        
Settlement, Expirations or Exercise $ (1,500,000) $ (1,000,000) $ (2,500,000) $ 2,000,000