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Note 7 - Use of Special Purpose Entities and Variable Interest Entities (Details) - Key Details of Financing VIEs (Parentheticals)
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12 Months Ended |
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Dec. 31, 2013
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Multi-Family Collateralized Mortgage Backed Securities [Member] | Minimum [Member]
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| Variable Interest Entity [Line Items] | |
| Pass-through rate | 5.35% |
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Collateralized Recourse Financing [Member] | Minimum [Member]
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| Variable Interest Entity [Line Items] | |
| Pass-through rate | 5.25% |
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Collateralized Recourse Financing [Member] | Maximum [Member]
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| Variable Interest Entity [Line Items] | |
| Pass-through rate | 6.50% |
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Residential Distressed Mortgage Loan Securitization [Member] | Minimum [Member]
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| Variable Interest Entity [Line Items] | |
| Pass-through rate | 4.25% |
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Residential Distressed Mortgage Loan Securitization [Member] | Maximum [Member]
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| Variable Interest Entity [Line Items] | |
| Pass-through rate | 4.85% |