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Loans and Advances to Banks, Net - Changes in gross carrying amount and corresponding allowance for ECL (Details) - Individual [Member] - CLP ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Financial assets at beginning of period |  | $ 1,012 | $ 772
Net change on ECL allowances | [1] | (880) | 259
Transfer to Stage 1 |  |  |
Transfer to Stage 2 |  |  |
Transfer to Stage 3 |  |  |
Impact on year-end ECL of exposures transferred between stages during the year | [2] |  | 3
Amounts written off |  |  |
Foreign exchange adjustments |  | (22) | (22)
Financial assets at end of period |  | 110 | 1,012
Stage 1 [Member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Financial assets at beginning of period |  | 937 | 772
Net change on ECL allowances | [1] | (832) | 250
Transfer to Stage 1 |  | 26 |
Transfer to Stage 2 |  | (27) | (63)
Transfer to Stage 3 |  |  |
Impact on year-end ECL of exposures transferred between stages during the year | [2] |  |
Amounts written off |  |  |
Foreign exchange adjustments |  | (20) | (22)
Financial assets at end of period |  | 84 | 937
Stage 2 [Member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Financial assets at beginning of period |  | 75 |
Net change on ECL allowances | [1] | (48) | 9
Transfer to Stage 1 |  | (26) |
Transfer to Stage 2 |  | 27 | 63
Transfer to Stage 3 |  |  |
Impact on year-end ECL of exposures transferred between stages during the year | [2] |  | 3
Amounts written off |  |  |
Foreign exchange adjustments |  | (2) |
Financial assets at end of period |  | 26 | 75
Stage 3 [Member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Financial assets at beginning of period |  |  |
Net change on ECL allowances | [1] |  |
Transfer to Stage 1 |  |  |
Transfer to Stage 2 |  |  |
Transfer to Stage 3 |  |  |
Impact on year-end ECL of exposures transferred between stages during the year | [2] |  |
Amounts written off |  |  |
Foreign exchange adjustments |  |  |
Financial assets at end of period |  |  |
Gross Carrying Amount [Member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Financial assets at beginning of period |  | 1,495,396 | 760,285
Net change on ECL allowances | [1] | (327,712) | 748,184
Transfer to Stage 1 |  |  |
Transfer to Stage 2 |  |  |
Transfer to Stage 3 |  |  |
Impact on year-end ECL of exposures transferred between stages during the year | [2] |  |
Amounts written off |  |  |
Foreign exchange adjustments |  | (27,493) | (13,073)
Financial assets at end of period |  | 1,140,191 | 1,495,396
Gross Carrying Amount [Member] | Stage 1 [Member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Financial assets at beginning of period |  | 1,467,502 | 760,285
Net change on ECL allowances | [1] | (321,373) | 746,808
Transfer to Stage 1 |  | 16,405 |
Transfer to Stage 2 |  | (126,709) | (26,518)
Transfer to Stage 3 |  |  |
Impact on year-end ECL of exposures transferred between stages during the year | [2] |  |
Changes to models and assumptions |  |  |
Amounts written off |  |  |
Foreign exchange adjustments |  | (17,274) | (13,073)
Financial assets at end of period |  | 1,018,551 | 1,467,502
Gross Carrying Amount [Member] | Stage 2 [Member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Financial assets at beginning of period |  | 27,894 |
Net change on ECL allowances | [1] | (6,339) | 1,376
Transfer to Stage 1 |  | (16,405) |
Transfer to Stage 2 |  | 126,709 | 26,518
Transfer to Stage 3 |  |  |
Impact on year-end ECL of exposures transferred between stages during the year | [2] |  |
Amounts written off |  |  |
Foreign exchange adjustments |  | (10,219) |
Financial assets at end of period |  | 121,640 | 27,894
Gross Carrying Amount [Member] | Stage 3 [Member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Financial assets at beginning of period |  |  |
Net change on ECL allowances | [1] |  |
Transfer to Stage 1 |  |  |
Transfer to Stage 2 |  |  |
Transfer to Stage 3 |  |  |
Impact on year-end ECL of exposures transferred between stages during the year | [2] |  |
Amounts written off |  |  |
Foreign exchange adjustments |  |  |
Financial assets at end of period |  |  |
[1] | Net change between assets originated and assets repaid, excluding write offs.
[2] | Represents the change in the year-end ECLs of exposures that were transferred from one stage to another during the year.

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