Quarterly report pursuant to Section 13 or 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
Jun. 30, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable $ 35,954 $ 23,437
Loans Held-for-sale, Mortgages [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 79 38
US Treasury Securities [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 1,101 1,003
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 9,089 5,844
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 16,049 9,770
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 6,869 4,454
Mortgage-backed Securities, Issued by Private Enterprises [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 2,767 2,328
Available-for-sale Securities [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable $ 34,774 $ 22,396