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Financial Assets Available-for-Sale and Financial Assets at Fair Value through Other Comprehensive Income - Analysis of changes (Details) $ in Thousands, $ in Millions | 12 Months Ended |  |
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Dec. 31, 2018 CLP ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CLP ($) | Dec. 31, 2017 CLP ($)
Financial Assets Available-for-Sale and Financial Assets at Fair Value through Other Comprehensive Income |  |  |  |
Financial assets at beginning of period | $ 4,390,903 |  |  |
Financial assets at end of period | 4,312,504 |  |  |
Financial assets available-for-sale |  |  |  | $ 1,526,315
Financial assets at fair value through other comprehensive income |  | $ 1,518,441 | $ 1,053,191 |
Debt instruments valued at fair value |  |  |  |
Financial Assets Available-for-Sale and Financial Assets at Fair Value through Other Comprehensive Income |  |  |  |
Financial assets at fair value through other comprehensive income |  |  | 1,043,440 | 1,516,063
Debt instruments valued at fair value | Investment grade |  |  |  |
Financial Assets Available-for-Sale and Financial Assets at Fair Value through Other Comprehensive Income |  |  |  |
Financial assets at fair value through other comprehensive income |  |  | 827,770 | 1,433,057
Debt instruments valued at fair value | Without rating |  |  |  |
Financial Assets Available-for-Sale and Financial Assets at Fair Value through Other Comprehensive Income |  |  |  |
Financial assets at fair value through other comprehensive income |  |  | 215,670 | $ 83,006
Debt instruments valued at fair value | Gross Balance |  |  |  |
Financial Assets Available-for-Sale and Financial Assets at Fair Value through Other Comprehensive Income |  |  |  |
Financial assets at beginning of period | 1,516,063 |  |  |
Change in fair value | 14,162 |  |  |
Foreign exchange adjustments | 28,558 |  |  |
Net change on financial assets | (515,343) |  |  |
Financial assets at end of period | 1,043,440 |  |  |
Debt instruments valued at fair value | Accumulated Amortization |  |  |  |
Financial Assets Available-for-Sale and Financial Assets at Fair Value through Other Comprehensive Income |  |  |  |
Financial assets at beginning of period | 5,820 |  |  |
Impact of net re-measurement of year end ECL | 258 |  |  |
Foreign exchange adjustments | 168 |  |  |
Net change on financial assets | (1,978) |  |  |
Financial assets at end of period | 4,268 |  |  |
Debt instruments valued at fair value | 12-month expected credit losses | Individual | Financial instruments not credit-impaired |  |  |  |
Financial Assets Available-for-Sale and Financial Assets at Fair Value through Other Comprehensive Income |  |  |  |
Financial assets at fair value through other comprehensive income |  |  | 1,043,440 |
Debt instruments valued at fair value | 12-month expected credit losses | Individual | Financial instruments not credit-impaired | Investment grade |  |  |  |
Financial Assets Available-for-Sale and Financial Assets at Fair Value through Other Comprehensive Income |  |  |  |
Financial assets at fair value through other comprehensive income |  |  | 827,770 |
Debt instruments valued at fair value | 12-month expected credit losses | Individual | Financial instruments not credit-impaired | Without rating |  |  |  |
Financial Assets Available-for-Sale and Financial Assets at Fair Value through Other Comprehensive Income |  |  |  |
Financial assets at fair value through other comprehensive income |  |  | 215,670 |
Debt instruments valued at fair value | 12-month expected credit losses | Individual | Financial instruments not credit-impaired | Gross Balance |  |  |  |
Financial Assets Available-for-Sale and Financial Assets at Fair Value through Other Comprehensive Income |  |  |  |
Financial assets at beginning of period | 1,516,063 |  |  |
Change in fair value | 14,162 |  |  |
Foreign exchange adjustments | 28,558 |  |  |
Net change on financial assets | (515,343) |  |  |
Financial assets at end of period | 1,043,440 |  |  |
Debt instruments valued at fair value | 12-month expected credit losses | Individual | Financial instruments not credit-impaired | Accumulated Amortization |  |  |  |
Financial Assets Available-for-Sale and Financial Assets at Fair Value through Other Comprehensive Income |  |  |  |
Financial assets at beginning of period | 5,820 |  |  |
Impact of net re-measurement of year end ECL | 258 |  |  |
Foreign exchange adjustments | 168 |  |  |
Net change on financial assets | (1,978) |  |  |
Financial assets at end of period | $ 4,268 |  |  |
Equity instruments valued at fair value |  |  |  |
Financial Assets Available-for-Sale and Financial Assets at Fair Value through Other Comprehensive Income |  |  |  |
Financial assets at fair value through other comprehensive income |  |  | 9,751 |
Other instruments issued in Chile | Equity instruments valued at fair value |  |  |  |
Financial Assets Available-for-Sale and Financial Assets at Fair Value through Other Comprehensive Income |  |  |  |
Financial assets at fair value through other comprehensive income |  |  | 8,939 |
Instruments issued by foreign institutions | Equity instruments valued at fair value |  |  |  |
Financial Assets Available-for-Sale and Financial Assets at Fair Value through Other Comprehensive Income |  |  |  |
Financial assets at fair value through other comprehensive income |  |  | $ 812 |

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