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, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable $ 54,080 $ 42,613
Loans Held-for-sale, Mortgages [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 5,353 247
Loans Held-for-investment, Mortgages [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 1,428 0
US Treasury Securities [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 1,101 1,119
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 13,660 11,888
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 19,732 17,101
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 8,880 8,962
Mortgage-backed Securities, Issued by Private Enterprises [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 3,926 3,296
Available-for-sale Securities [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable $ 46,198 $ 41,247