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Accrued Interest Receivable Schedule of Accounts, Notes, Loans and Financing Receivable (Details) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2013
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Dec. 31, 2012
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Interest Receivable | $ 47,089 | $ 42,613 |
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Loans Held-for-sale, Mortgages [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Interest Receivable | 1,400 | 247 |
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Loans Held-for-investment, Mortgages [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Interest Receivable | 1,401 | 0 |
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US Treasury Securities [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Interest Receivable | 173 | 1,119 |
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Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Interest Receivable | 13,088 | 11,888 |
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Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Interest Receivable | 18,296 | 17,101 |
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Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Interest Receivable | 8,910 | 8,962 |
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Mortgage-backed Securities, Issued by Private Enterprises [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Interest Receivable | 3,821 | 3,296 |
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Available-for-sale Securities [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Interest Receivable | $ 44,115 | $ 41,247 |