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Financial instruments with off-balance sheet risk or concentrations of credit risk (Details) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013
Guarantor Obligations [Line Items] |  |
Asset | $ 22,516,000 | $ 39,045,000
Liability | (10,528,000) | (8,819,000)
Written Credit Derivatives |  |
Guarantor Obligations [Line Items] |  |
Credit Derivative, Collateral | 363,300,000 | 689,500,000
0-5 years | 9,105,000 | 9,882,000
5 years or Greater Expiring Through 2047 | 6,931,000 | 550,000
Total Written Credit Default Swaps | 16,036,000 | 10,432,000
Asset | 1,221,000 | 1,157,000
Liability | (1,254,000) | (348,000)
Net Asset/(Liability) | (33,000) | 809,000
Written Credit Derivatives | Single name (0 - 250) |  |
Guarantor Obligations [Line Items] |  |
0-5 years | 0 | 368,000
5 years or Greater Expiring Through 2047 | 4,555,000 | 0
Total Written Credit Default Swaps | 4,555,000 | 368,000
Asset | 0 | 0
Liability | (1,254,000) | (104,000)
Net Asset/(Liability) | (1,254,000) | (104,000)
Written Credit Derivatives | Single name (251-500) |  |
Guarantor Obligations [Line Items] |  |
0-5 years | 9,105,000 | 9,514,000
5 years or Greater Expiring Through 2047 | 2,376,000 | 0
Total Written Credit Default Swaps | 11,481,000 | 9,514,000
Asset | 1,221,000 | 1,136,000
Liability | 0 | 0
Net Asset/(Liability) | 1,221,000 | 1,136,000
Written Credit Derivatives | Index (0-250) |  |
Guarantor Obligations [Line Items] |  |
0-5 years | 0 | 0
5 years or Greater Expiring Through 2047 | 0 | 550,000
Total Written Credit Default Swaps | 0 | 550,000
Asset | 0 | 21,000
Liability | 0 | (244,000)
Net Asset/(Liability) | 0 | (223,000)
Credit risk exposure |  |
Guarantor Obligations [Line Items] |  |
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure | 7,800,000 | 19,000,000
Estimate of Fair Value Measurement [Member] | Written Credit Derivatives |  |
Guarantor Obligations [Line Items] |  |
Credit Derivative, Collateral | $ 1,600,000 | $ 2,600,000

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- Definition Credit Derivative, Collateral + References No definition available. + Details
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- Definition Credit Derivative, Maximum Exposure, Undiscounted, After Year Five + References No definition available. + Details
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- Definition Credit Derivative , Maximum Exposure, Undiscounted, Through Year Five + References No definition available. + Details
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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 + Details
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- Definition Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5708775-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Credit Derivative -URI http://asc.fasb.org/extlink&oid=6854095 + Details
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- Definition Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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