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, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable $ 50,110 $ 50,303
Loans Held-for-sale, Mortgages [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 1,673 4,136
Loans Held-for-investment, Mortgages [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 4,331 4,506
US Treasury Securities [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 2,348 2,361
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 10,488 10,583
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 17,157 15,034
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 10,160 10,007
Mortgage-backed Securities, Issued by Private Enterprises [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable 3,953 3,676
Available-for-sale Securities [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest Receivable $ 41,758 $ 39,300