Quarterly report pursuant to Section 13 or 15(d)

Schedule of Available-for-sale Securities Reconciliation (Details)

v2.4.0.6
Schedule of Available-for-sale Securities Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross Unrealized Gains $ 292,608 $ 120,745
Available-for-sale Securities, Gross Unrealized Losses 89,810 179,461
Available-for-sale securities, at fair value 10,724,149 6,249,252
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Face Value 9,298,257 5,692,754
Available-for-sale Securities, Unamortized Premium 548,956 279,640
Available-for-sale Securities, Designated Credit Reserve 0 0
Available-for-sale Securities, Net, Unamortized (1,351,394) (1,008,780)
Available-for-sale Securities, Amortized Cost Basis 8,495,819 4,963,614
Available-for-sale Securities, Gross Unrealized Gains 230,117 108,864
Available-for-sale Securities, Gross Unrealized Losses (13,734) (19,321)
Available-for-sale securities, at fair value 8,712,202 5,053,157
Mortgage-backed Securities, Issued by Private Enterprises [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Face Value 4,291,928 2,667,929
Available-for-sale Securities, Unamortized Premium 0 0
Available-for-sale Securities, Designated Credit Reserve (1,322,098) (782,606)
Available-for-sale Securities, Net, Unamortized (944,298) (540,969)
Available-for-sale Securities, Amortized Cost Basis 2,025,532 1,344,354
Available-for-sale Securities, Gross Unrealized Gains 62,491 11,881
Available-for-sale Securities, Gross Unrealized Losses (76,076) (160,140)
Available-for-sale securities, at fair value 2,011,947 1,196,095
Collateralized Mortgage Backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Face Value 13,590,185 8,360,683
Available-for-sale Securities, Unamortized Premium 548,956 279,640
Available-for-sale Securities, Designated Credit Reserve (1,322,098) (782,606)
Available-for-sale Securities, Net, Unamortized (2,295,692) (1,549,749)
Available-for-sale Securities, Amortized Cost Basis 10,521,351 6,307,968
Available-for-sale Securities, Gross Unrealized Gains 292,608 120,745
Available-for-sale Securities, Gross Unrealized Losses (89,810) (179,461)
Available-for-sale securities, at fair value $ 10,724,149 $ 6,249,252