Annual report pursuant to Section 13 and 15(d)

Accrued Interest Receivable Schedule of Accounts, Notes, Loans and Financing Receivable (Details)

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Accrued Interest Receivable Schedule of Accounts, Notes, Loans and Financing Receivable (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable $ 23,437 $ 5,383
US Treasury Securities [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 1,003 192
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 5,844 1,509
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 9,770 2,201
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 4,454 532
Mortgage-backed Securities, Issued by Private Enterprises [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 2,328 949
Available-for-sale Securities [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 22,396 5,191
Loans Held-for-sale, Mortgages [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable $ 38 $ 0