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Financial Assets at Fair Value through Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure Of Available For Sale Financial Assets And Financial Assets At Fair Value Through Other Comprehensive Income [Abstract] |
Schedule of financial assets |
|  | 2020 |  |  | 2021 |
|  | MCh$ |  |  | MCh$ |
Debt instruments at fair value through OCI |  |  | 1,060,523 |  |  |  | 3,054,809 |
Equity instruments valued at fair value through OCI |  |  | 7,630 |  |  |  | 6,365 |
Total |  |  | 1,068,153 |  |  |  | 3,061,174 |
Schedule of breakdown of the balance under the heading "Debt instruments at fair value through OCI |
|  | 2020 |  |  | 2021 |
|  | MCh$ |  |  | MCh$ |
Instruments issued by the Chilean Government and the Central Bank of Chile: |  |  |  |  |  |
Bonds issued by the Chilean Government and the Central Bank of Chile |  |  | 109 |  |  |  | 102 |
Promissory notes issued by the Chilean Government and the Central Bank of Chile |  |  | — |  |  |  | — |
Other instruments |  |  | 163,491 |  |  |  | 2,488,748 |
Other instruments issued in Chile: |  |  |  |  |  |  |  |
Mortgage bonds from domestic banks |  |  | 128,763 |  |  |  | 111,656 |
Bonds from domestic banks |  |  | 15,887 |  |  |  | 2,411 |
Deposits from domestic banks |  |  | 685,392 |  |  |  | 424,419 |
Bonds from other Chilean companies |  |  | 34,539 |  |  |  | 27,473 |
Other instruments |  |  | 32,342 |  |  |  | — |
Instruments issued by foreign institutions: |  |  |  |  |  |  |  |
Other instruments |  |  | — |  |  |  | — |
Total |  |  | 1,060,523 |  |  |  | 3,054,809 |
Schedule of credit ratings of the issuers of debt instruments |
|  | As of December 31, 2020 |  |  | As of December 31, 2021 |
|  | Stage 1 Individual |  |  | Stage 2 Individual |  |  | Stage 3 Individual |  |  | Total Individual |  |  | Stage 1 Individual |  |  | Stage 2 Individual |  |  | Stage 3 Individual |  |  | Total Individual |
|  | MCh$ |  |  | MCh$ |  |  | MCh$ |  |  | MCh$ |  |  | MCh$ |  |  | MCh$ |  |  | MCh$ |  |  | MCh$ |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment grade |  |  | 1,027,965 |  |  |  | 216 |  |  |  | — |  |  |  | 1,028,181 |  |  |  | 3,054,795 |  |  |  | 14 |  |  |  | — |  |  |  | 3,054,809 |
Non-investment grade |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Without rating |  |  | 32,342 |  |  |  | — |  |  |  | — |  |  |  | 32,342 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  |  | 1,060,307 |  |  |  | 216 |  |  |  | — |  |  |  | 1,060,523 |  |  |  | 3,054,795 |  |  |  | 14 |  |  |  | — |  |  |  | 3,054,809 |
Schedule of changes in the corresponding ECLs of debt instrument |
|  | Stage 1 Individual |  |  | Stage 2 Individual |  |  | Stage 3 Individual |  |  | Total |
|  | Fair value MCh$ |  |  | ECL MCh$ |  |  | Fair value MCh$ |  |  | ECL MCh$ |  |  | Fair value MCh$ |  |  | ECL MCh$ |  |  | Fair value MCh$ |  |  | ECL MCh$ |
Balance as of January 1, 2020 |  |  | 1,357,846 |  |  |  | 7,736 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,357,846 |  |  |  | 7,736 |
Net change on Balance * |  |  | (306,649 | ) |  |  | 1,519 |  |  |  | (255 | ) |  |  | (7 | ) |  |  | — |  |  |  | — |  |  |  | (306,904 | ) |  |  | 1,512 |
Change in fair value |  |  | 14,217 |  |  |  | — |  |  |  | (6 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 14,211 |  |  |  | — |
Transfer to Stage 1 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Transfer to Stage 2 |  |  | (477 | ) |  |  | (12 | ) |  |  | 477 |  |  |  | 12 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Transfer to Stage 3 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Impact on year-end ECL of exposures transferred between stages during the year ** |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1 |
Impact of net re-measurement of year-end ECL |  |  | — |  |  |  | (6,120 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (6,120 | )
Amounts written off |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Foreign exchange adjustments |  |  | (4,630 | ) |  |  | (45 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (4,630 | ) |  |  | (45 | )
Balance as of December 31, 2020 |  |  | 1,060,307 |  |  |  | 3,078 |  |  |  | 216 |  |  |  | 6 |  |  |  | — |  |  |  | — |  |  |  | 1,060,523 |  |  |  | 3,084 |
Balance as of January 1, 2021 |  |  | 1,060,307 |  |  |  | 3,078 |  |  |  | 216 |  |  |  | 6 |  |  |  | — |  |  |  | — |  |  |  | 1,060,523 |  |  |  | 3,084 |
Net change on Balance * |  |  | 2,096,637 |  |  |  | (4,265 | ) |  |  | (276 | ) |  |  | (8 | ) |  |  | — |  |  |  | — |  |  |  | 2,096,361 |  |  |  | (4,273 | )
Change in fair value |  |  | (103,047 | ) |  |  | — |  |  |  | (60 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (103,107 | ) |  |  | — |
Transfer to Stage 1 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Transfer to Stage 2 |  |  | (134 | ) |  |  | (4 | ) |  |  | 134 |  |  |  | 4 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Transfer to Stage 3 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Impact on year-end ECL of exposures transferred between stages during the year ** |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Impact of net re-measurement of year-end ECL |  |  | — |  |  |  | 5,270 |  |  |  | — |  |  |  | (2 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,268 |
Amounts written off |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Foreign exchange adjustments |  |  | 1,032 |  |  |  | 6 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,032 |  |  |  | 6 |
Balance as of December 31, 2021 |  |  | 3,054,795 |  |  |  | 4,085 |  |  |  | 14 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,054,809 |  |  |  | 4,085 |
Schedule of breakdown of the balance under the heading Equity instruments at fair value through OCI |
|  | 2020 |  |  | 2021 |
|  | MCh$ |  |  | MCh$ |
Equity instruments issued in Chile |  |  | 6,869 |  |  |  | 5,499 |
Equity instruments issued by foreign institutions |  |  | 761 |  |  |  | 866 |
Total |  |  | 7,630 |  |  |  | 6,365 |
Schedule of unrealised gain and loss on available for sale investments |
|  | 2019 |  |  | 2020 |  |  | 2021 |
|  | MCh$ |  |  | MCh$ |  |  | MCh$ |
Net gain (loss) on financial assets before income tax (1) |  |  | 15,969 |  |  |  | (8,540 | ) |  |  | (52,913 | )
Tax (expense) benefit |  |  | (4,328 | ) |  |  | 2,304 |  |  |  | 4,171 |
Net of tax amount (2) |  |  | 11,641 |  |  |  | (6,236 | ) |  |  | (48,742 | )

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