Annual report pursuant to Section 13 and 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
Dec. 31, 2011
Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross Unrealized Gains $ 120,745 $ 30,811
Available-for-sale Securities, Gross Unrealized Losses 179,461 8,192
Available-for-sale Securities 6,249,252 1,354,405
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Face Value 5,692,754 1,306,655
Available-for-sale Securities, Unamortized Premium 279,640 41,651
Available-for-sale Securities, Designated Credit Reserve 0 0
Available-for-sale Securities, Net, Unamortized (1,008,780) (334,979)
Available-for-sale Securities, Amortized Cost Basis 4,963,614 1,013,327
Available-for-sale Securities, Gross Unrealized Gains 108,864 9,308
Available-for-sale Securities, Gross Unrealized Losses (19,321) (6,166)
Available-for-sale Securities 5,053,157 1,016,469
Mortgage-backed Securities, Issued by Private Enterprises [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Face Value 2,667,929 594,306
Available-for-sale Securities, Unamortized Premium 0 0
Available-for-sale Securities, Designated Credit Reserve (782,606) (145,855)
Available-for-sale Securities, Net, Unamortized (540,969) (129,992)
Available-for-sale Securities, Amortized Cost Basis 1,344,354 318,459
Available-for-sale Securities, Gross Unrealized Gains 11,881 21,503
Available-for-sale Securities, Gross Unrealized Losses (160,140) (2,026)
Available-for-sale Securities 1,196,095 337,936
Collateralized Mortgage Backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Face Value 8,360,683 1,900,961
Available-for-sale Securities, Unamortized Premium 279,640 41,651
Available-for-sale Securities, Designated Credit Reserve (782,606) (145,855)
Available-for-sale Securities, Net, Unamortized (1,549,749) (464,971)
Available-for-sale Securities, Amortized Cost Basis 6,307,968 1,331,786
Available-for-sale Securities, Gross Unrealized Gains 120,745 30,811
Available-for-sale Securities, Gross Unrealized Losses (179,461) (8,192)
Available-for-sale Securities $ 6,249,252 $ 1,354,405