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Accrued Interest Receivable Schedule of Accounts, Notes, Loans and Financing Receivable (Details) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2012
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Dec. 31, 2011
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Interest Receivable | $ 30,801 | $ 23,437 |
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Loans Held-for-sale, Mortgages [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Interest Receivable | 34 | 38 |
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US Treasury Securities [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Interest Receivable | 1,155 | 1,003 |
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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 | 7,203 | 5,844 |
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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 | 13,830 | 9,770 |
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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 | 5,725 | 4,454 |
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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 | 2,854 | 2,328 |
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Available-for-sale Securities [Member]
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| Accounts, Notes, Loans and Financing Receivable [Line Items] | ||
| Interest Receivable | $ 29,612 | $ 22,396 |