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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 |
6 Months Ended | 12 Months Ended |
|---|---|---|
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Jun. 30, 2014
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Dec. 31, 2013
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Trading securities | $ 34,129 | $ 35,991 |
| Derivative assets | 52 | |
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Significant unobservable inputs
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | ||
| Total | 193 | 274 |
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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 | $ 193 | $ 274 |
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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 | 0.54% | 0.58% |
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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 | 33.65% | 33.68% |