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Financial risk management, objectives and policies (Details 3) - PEN (S/) S/ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of financial liabilities [line items] |  |  |
Net | S/ 11,865 | S/ 100,680 |
Discounted at the applicable interbank rates | 489 | 69,912 | S/ 124,770
Not later than one month [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net |  |  |
Discounted at the applicable interbank rates |  |  |
Not later than three months [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net | (2,841) | (2,942) |
Discounted at the applicable interbank rates | (2,836) | (2,933) |
Not later than one year [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net | (13,032) | (13,556) |
Discounted at the applicable interbank rates | (12,885) | (13,341) |
Later than one year and not later than five years [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net | (100,102) | (105,069) |
Discounted at the applicable interbank rates | (94,939) | (97,541) |
Later than five years [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net | 127,840 | 222,247 |
Discounted at the applicable interbank rates | 111,149 | 183,727 |
Inflows [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net | 139,785 | 259,195 |
Inflows [Member] | Not later than one month [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net |  |  |
Inflows [Member] | Not later than three months [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net |  |  |
Inflows [Member] | Not later than one year [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net |  |  |
Inflows [Member] | Later than one year and not later than five years [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net |  |  |
Inflows [Member] | Later than five years [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net | 139,785 | 259,195 |
Outflows [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net | (127,920) | (158,515) |
Outflows [Member] | Not later than one month [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net |  |  |
Outflows [Member] | Not later than three months [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net | (2,841) | (2,942) |
Outflows [Member] | Not later than one year [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net | (13,032) | (13,556) |
Outflows [Member] | Later than one year and not later than five years [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net | (100,102) | (105,069) |
Outflows [Member] | Later than five years [Member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Net | S/ (11,945) | S/ (36,948) |

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