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Derivative instruments (Cross-currency Interest Rate Swap) (Details) - Cross-Currency Interest Rate Swaps - Cash Flow Hedging R$ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2018 BRL (R$) | Dec. 31, 2018 USD ($) | Apr. 30, 2017 BRL (R$) | Apr. 30, 2017 USD ($)
JP Morgan Chase Bank, N.A. |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Payments for derivative instrument | $ 2,689 |  |  |  |
Amount deferred in accumulated other comprehensive (loss) income | $ 677 |  |  |  |
Cross-Currency Interest Rate Swap Originated November 2013 | JP Morgan Chase Bank, N.A. | Payable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | R$ |  | R$ 108,000 |  |  |
Cross-Currency Interest Rate Swap Originated November 2013 | JP Morgan Chase Bank, N.A. | Receivable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  |  | $ 35,400 |  |
Interest rate (as a percent) |  | 4.38% | 4.38% |  |
Cross-Currency Interest Rate Swap Originated November 2013 | Brazil Real | JP Morgan Chase Bank, N.A. | Payable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest rate (as a percent) |  | 13.00% | 13.00% |  |
Cross-Currency Interest Rate Swap Originated June 2017 | JP Morgan Chase Bank, N.A. | Payable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | R$ |  | R$ 98,670 |  |  |
Cross-Currency Interest Rate Swap Originated June 2017 | JP Morgan Chase Bank, N.A. | Receivable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  |  | $ 30,000 |  |
Interest rate (as a percent) |  | 6.02% | 6.02% |  |
Cross-Currency Interest Rate Swap Originated June 2017 | Brazil Real | JP Morgan Chase Bank, N.A. | Payable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest rate (as a percent) |  | 13.00% | 13.00% |  |
Cross-Currency Interest Rate Swap Originated July 2017 | Citibank N.A. | Payable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | R$ |  | R$ 94,200 |  |  |
Cross-Currency Interest Rate Swap Originated July 2017 | Citibank N.A. | Receivable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  |  | $ 30,000 |  |
Interest rate (as a percent) |  | 6.29% | 6.29% |  |
Cross-Currency Interest Rate Swap Originated July 2017 | Brazil Real | Citibank N.A. | Payable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest rate (as a percent) |  | 13.00% | 13.00% |  |
Subsidiaries | Banco Santander (Brasil) S.A., Cayman Islands Branch | Payable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | R$ |  |  |  | R$ 155,500 |
Subsidiaries | Banco Santander (Brasil) S.A., Cayman Islands Branch | Receivable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  |  |  |  | $ 50,000
Interest rate (as a percent) |  |  |  | 6.91% | 6.91%
Subsidiaries | Brazil Real | Banco Santander (Brasil) S.A., Cayman Islands Branch | Payable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest rate (as a percent) |  |  |  | 13.77% | 13.77%
Subsidiaries | Cross-Currency Interest Rate Swap Originated November 2013 | BAML [Member] | Payable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | R$ |  |  |  | R$ 156,250 |
Subsidiaries | Cross-Currency Interest Rate Swap Originated November 2013 | BAML [Member] | Receivable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  |  |  |  | $ 50,000
Interest rate (as a percent) |  |  |  | 6.91% | 6.91%
Subsidiaries | Cross-Currency Interest Rate Swap Originated November 2013 | Brazil Real | BAML [Member] | Payable |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest rate (as a percent) |  |  |  | 13.64% | 13.64%

X
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- Definition The cash outflow for derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3505-108585 + Details
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