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Summary of Significant Accounting Policies - Estimated useful life of assets (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Buildings
Property and Equipment
Estimated useful life	50 years	50 years
Installations (in general)
Property and Equipment
Estimated useful life	10 years	10 years
Equipment
Property and Equipment
Estimated useful life	5 years	5 years
Office furniture
Property and Equipment
Estimated useful life	5 years	5 years
Maximum | Software or computer programs
Property and Equipment
Estimated useful life	6 years

X

- 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

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Namespace Prefix:	bch_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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

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X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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X

- Details

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X

- Details

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X

- Details

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