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v3.20.1

Summary of Significant Accounting Policies - Estimated useful life of assets (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Property and Equipment |  |
Estimated useful life | 6 years |
Buildings [Member] |  |
Property and Equipment |  |
Estimated useful life | 50 years | 50 years
Installations (in general) [Member] |  |
Property and Equipment |  |
Estimated useful life | 10 years | 10 years
Equipment [Member] |  |
Property and Equipment |  |
Estimated useful life | 5 years | 5 years
Office furniture [Member] |  |
Property and Equipment |  |
Estimated useful life | 5 years | 5 years

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- Definition Represents the information pertaining to estimated useful life of the assets, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | bch_UsefulLifeOfAssets
Namespace Prefix: | bch_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_BuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=bch_InstallationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=bch_EquipmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_OfficeEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |