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Summary of Significant Accounting Policies - Loans (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 CLP ($) item
Loans written off
Threshold nonperforming period for substandard loans	30 days
Minimum number of installments overdue to be classified as non-compliant	1
Threshold past due period for non-complying loans	90 days
Cut off amount for individual evaluation for corporate customers | $	$ 536
Number of components of loss	2
Consumer loans
Loans written off
Maximum period allowed to written off loans	6 months
Other transactions - unsecured
Loans written off
Maximum period allowed to written off loans	24 months
Commercial loans - secured
Loans written off
Maximum period allowed to written off loans	36 months
Residential mortgage loans
Loans written off
Maximum period allowed to written off loans	48 months
Consumer leases
Loans written off
Maximum period allowed to written off loans	6 months
Other non-real estate lease transactions
Loans written off
Maximum period allowed to written off loans	12 months
Real estate leases (commercial or residential)
Loans written off
Maximum period allowed to written off loans	36 months

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- Definition

The cut off evaluation for corporate customers.

+ References

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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.

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- Definition

The maximum period in which loans are written off, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Represents the minimum number of installments overdue to be classified as non-compliant.

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- Definition

The number of components of loss reported by the entity.

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- Definition

The threshold non-performing period for loans to be classified as Substandard.

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- Definition

The threshold past due period for loans to be classified as Non-complying.

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