| a) | Derivative financial instruments assets |
| December 31, 2017 | | ||||||||||||||||||
| | | | | | Gross amounts offset in the consolidated | | Net amount of assets presented in the | | Gross amounts not offset in the consolidated statement of financial position | | | | | ||||||
| Description | | Gross amounts assets | | statement of financial position | | consolidated statement of financial position | | Financial instruments | | Cash collateral received | | Net Amount | | ||||||
| Derivative financial instruments used for hedging receivable at fair value | | | 13,338 | | | - | | | 13,338 | | | - | | | (22,304) | | | (8,966) | |
| Total | | | 13,338 | | | - | | | 13,338 | | | - | | | (22,304) | | | (8,966) | |
| December 31, 2016 | | ||||||||||||||||||
| | | | | | Gross amounts offset in the consolidated | | Net amount of assets presented in the | | Gross amounts not offset in the consolidated statement of financial position | | | | | ||||||
| Description | | Gross amounts assets | | statement of financial position | | consolidated statement of financial position | | Financial instruments | | Cash collateral received | | Net Amount | | ||||||
| Derivative financial instruments used for hedging receivable at fair value | | | 9,352 | | | - | | | 9,352 | | | - | | | - | | | 9,352 | |
| Total | | | 9,352 | | | - | | | 9,352 | | | - | | | - | | | 9,352 | |
| | | December 31, 2017 | | |||||||
| Description | | Gross amounts of assets | | Gross amounts offset in the consolidated statement of financial position | | Net amount of assets presented in the consolidated statement of financial position | | |||
| Derivative financial instruments used for hedging receivable at fair value | | | 13,338 | | | - | | | 13,338 | |
| Total | | | 13,338 | | | - | | | 13,338 | |
| | | December 31, 2016 | | |||||||
| Description | | Gross amounts of assets | | Gross amounts offset in the consolidated statement of financial position | | Net amount of assets presented in the consolidated statement of financial position | | |||
| Derivative financial instruments used for hedging receivable at fair value | | | 9,352 | | | - | | | 9,352 | |
| Total | | | 9,352 | | | - | | | 9,352 | |