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Financial instruments with off-balance sheet risk or concentrations of credit risk (Tables) | 6 Months Ended
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Jun. 30, 2014
Guarantees [Abstract] |
Schedule of certain information related to the Company’s written credit derivatives | The following table sets forth certain information related to the Company’s written credit derivatives as of June 30, 2014 and December 31, 2013:
June 30, 2014 |  | Maximum Payout/ Notional Amount (by period of expiration) |  | Fair Value of Written Credit Derivatives (2)
Credit Spreads on underlying (basis points) |  | 0-5 years |  | 5 years or Greater Expiring Through 2047 |  | Total Written Credit Default Swaps (1) |  | Asset |  | Liability |  | Net Asset/(Liability)
|  | ($ in thousands)
Single name (0 - 250) |  | $ | — |  |  | $ | 4,555 |  |  | $ | 4,555 |  |  | $ | — |  |  | $ | 1,254 |  |  | $ | (1,254 | )
Single name (251-500) |  | 9,105 |  |  | 2,376 |  |  | 11,481 |  |  | 1,221 |  |  | — |  |  | 1,221 |
Index (0-250) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
|  | $ | 9,105 |  |  | $ | 6,931 |  |  | $ | 16,036 |  |  | $ | 1,221 |  |  | $ | 1,254 |  |  | $ | (33 | )
December 31, 2013 |  | Maximum Payout/ Notional Amount (by period of expiration) |  | Fair Value of Written Credit Derivatives (2)
Credit Spreads on underlying (basis points) |  | 0-5 years |  | 5 years or Greater Expiring Through 2046 |  | Total Written Credit Default Swaps (1) |  | Asset |  | Liability |  | Net Asset/(Liability)
|  | ($ in thousands)
Single name (0 - 250) |  | $ | 368 |  |  | $ | — |  |  | $ | 368 |  |  | $ | — |  |  | $ | (104 | ) |  | $ | (104 | )
Single name (251-500) |  | 9,514 |  |  | — |  |  | 9,514 |  |  | 1,136 |  |  | — |  |  | 1,136 |
Index (0-250) |  | — |  |  | 550 |  |  | 550 |  |  | 21 |  |  | (244 | ) |  | (223 | )
|  | $ | 9,882 |  |  | $ | 550 |  |  | $ | 10,432 |  |  | $ | 1,157 |  |  | $ | (348 | ) |  | $ | 809 |
(1) | As of June 30, 2014 and December 31, 2013, the Company did not hold any offsetting buy protection credit derivatives with the same underlying reference obligation.
(2) | Fair value amounts of derivative contracts are shown on a gross basis prior to cash collateral or counterparty netting.

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- Definition Schedule of Credit Derivatives [Table Text Block] + References No definition available. + Details
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- Details
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