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Risk Management - Risk Management Structure (Details)	12 Months Ended
	Dec. 31, 2017 CLF ( ) director	Dec. 31, 2016
Risk Management
Number of directors in Finance, International and Financial Risk Committee	4
Minimum amount for review of approved application by Directors Credit Committee |	750,000
Number of directors in Portfolio Risk Committee	2
Maximum exposure to credit risk does not exceed (in percentage)	10.00%	10.00%

X

- Definition

Represents the percentage of maximum exposure to credit risk without taking into account guarantees or other credit enhancements by client or counterparty, does not exceed.

+ References

No definition available.

+ Details

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X

- Definition

Minimum amount for review of approved applications by the Directors Credit Committee.

+ References

No definition available.

+ Details

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Namespace Prefix:	bch_
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X

- Definition

Number of directors in Finance, International and Financial Risk Committee.

+ References

No definition available.

+ Details

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Namespace Prefix:	bch_
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X

- Definition

Number of directors in Portfolio Risk Committee.

+ References

No definition available.

+ Details

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Namespace Prefix:	bch_
Data Type:	xbrli:integerItemType
Balance Type:	na
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- References

No definition available.

+ Details

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