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Fair Value of Financial Instruments (Significant Observable Inputs used in the Valuation of Privately held Securities and Credit Default Assets) (Details) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | 12 Months Ended |
|---|---|---|
|
Sep. 30, 2013
|
Dec. 31, 2012
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Trading securities | $ 39,333 | $ 59,982 |
| Derivative assets | 2 | 834 |
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Significant unobservable inputs
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Total | 298 | 2,322 |
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Significant unobservable inputs | Privately held equity securities | Discounted cash flow
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Trading securities | 0 | 1,224 |
|
Significant unobservable inputs | Privately held equity securities | Discounted cash flow | Minimum
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Swap rate | 0.239% | |
| Expected term | 1 year | |
| Expected qtrly cash flow streams | 52 | |
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Significant unobservable inputs | Privately held equity securities | Discounted cash flow | Maximum
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Swap rate | 0.30% | |
| Expected term | 4 years 9 months 15 days | |
| Expected qtrly cash flow streams | 1,574 | |
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Significant unobservable inputs | Privately held equity securities | Discounted cash flow | Weighted average
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Swap rate | 0.27% | |
| CMBS spread | 34.50% | |
| Expected term | 2 years 10 months 24 days | |
| Expected qtrly cash flow streams | 147 | |
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Significant unobservable inputs | Tax-exempt municipal | Discounted cash flow
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Trading securities | 298 | 264 |
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Significant unobservable inputs | Tax-exempt municipal | Discounted cash flow | Minimum
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Short and long term cash flows | 0.6294% | 0.8435% |
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Significant unobservable inputs | Tax-exempt municipal | Discounted cash flow | Maximum
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Short and long term cash flows | 33.73% | 37.469% |
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Significant unobservable inputs | Total derivative assets | Market comparable approach
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Derivative assets | $ 0 | $ 834 |
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Significant unobservable inputs | Total derivative assets | Market comparable approach | Minimum
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Offered quote | 88.28% | |
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Significant unobservable inputs | Total derivative assets | Market comparable approach | Maximum
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Offered quote | 96.66% | |
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Significant unobservable inputs | Total derivative assets | Market comparable approach | Weighted average
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Offered quote | 93.71% |