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13 Investment properties (Tables) | 12 Months Ended
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Dec. 31, 2020
Investment property [abstract] |
Schedule of investment properties |
| December 31, 2019 | Transfers | Depreciation | December 31, 2020
Investment properties | 47,562 | (1,240) | (48) | 46,274
| December 31, 2018 |  | Transfers |  | Depreciation |  | December 31, 2019
Investment properties | 47,620 |  | (9) |  | (49) |  | 47,562
| December 31, 2017 |  | Write-offs and disposals |  | Transfers |  | Depreciation |  | December 31, 2018
Investment properties | 57,652 |  | (9,995) |  | 13 |  | (50) |  | 47,620

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