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Fair Value (Details 1) (USD $) In Thousands, unless otherwise specified |  |  | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 Cusip One [Member] Number | Jun. 30, 2014 Cusip Two [Member] Number | Jun. 30, 2014 Cusip Three [Member] Number | Jun. 30, 2014 Cusip Four [Member] Number
Fair Value Pooled Trust Preferred Securities [Line Items] |  |  |  |  |  |  |  |  |  |
Cusip |  |  | 74043CAC1 |  | 74042TAJ0 |  | 01449TAB9 |  | 01450NAC6 |
Deal name |  |  | PreTSL XXIV |  | PreTSL XXVII |  | Alesco IX |  | Alesco XVII |
Class |  |  | B-1 |  | C-1 |  | A-2A |  | B |
Book value | $ 208,850 | $ 199,125 | $ 1,257 |  | $ 1,296 |  | $ 1,303 |  | $ 1,352 |
Fair value | 209,379 | 194,296 | 533 |  | 522 |  | 832 |  | 557 |
Unrealized gains/(losses) |  |  | (724) |  | (774) |  | (471) |  | (795) |
Lowest credit rating assigned |  |  | CC |  | C |  | BB |  | CC |
Number of performing banks |  |  | 53 |  | 30 |  | 55 |  | 46 |
Number of performing insurance companies |  |  | 13 |  | 7 |  | 10 |  |  |
Number of issuers in default |  |  | 17 |  | 9 |  | 1 |  | 3 |
Number of issuers in deferral |  |  | 10 |  | 3 |  | 10 |  | 7 |
Defaults & deferrals as a % of performing collateral |  |  | 40.78% |  | 25.75% |  | 17.22% |  | 22.89% |
Subordination: |  |  |  |  |  |  |  |  |  |
As a % of performing collateral |  |  | 6.65% |  | (2.41%) |  | 41.15% |  | 22.09% |
As a % of performing collateral - adjusted for projected future defaults |  |  | (0.92%) |  | (11.80%) |  | 37.39% |  | 17.38% |
Other-than-temporary impairment model assumptions: |  |  |  |  |  |  |  |  |  |
Year 1 - issuer average |  |  | 2.50% |  | 2.80% |  | 2.00% |  | 1.90% |
Year 2 - issuer average |  |  | 2.50% |  | 2.80% |  | 2.00% |  | 1.90% |
Year 3 - issuer average |  |  | 2.50% |  | 2.80% |  | 2.00% |  | 1.90% |
> 3 Years - issuer average |  |  |  | [1] |  | [1] |  | [1] |  | [1]
Discount rate - 3 month Libor, plus implicit yield spread at purchase |  |  | 1.48% |  | 1.23% |  | 1.27% |  | 1.44% |
Recovery assumptions |  |  |  | [2] |  | [2] |  | [2] |  | [2]
Prepayments |  |  | 0.00% |  | 0.00% |  | 0.00% |  | 0.00% |
Other-than-temporary impairment | $ 271 | $ 271 | $ 41 |  | $ 132 |  | $ 36 |  | $ 62 |
[1] | Default rates > 3 years are evaluated on a issuer by issuer basis and range from 0.25% to 5.00%.
[2] | Recovery assumptions are evaluated on a issuer by issuer basis and range from 0% to 15% with a five year lag.

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