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Financial Assets at Fair Value through Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Available For Sale Financial Assets And Financial Assets At Fair Value Through Other Comprehensive Income [Abstract] |
Schedule of financial assets |
|  | 2019 |  |  | 2020 |
|  | MCh$ |  |  | MCh$ |
Debt instruments at fair value through OCI |  |  | 1,357,846 |  |  |  | 1,060,523 |
Equity instruments valued at fair value through OCI |  |  | 8,497 |  |  |  | 7,630 |
Total |  |  | 1,366,343 |  |  |  | 1,068,153 |
Schedule of breakdown of the balance under the heading "Debt instruments at fair value through OCI |
|  | 2019 |  |  | 2020 |
|  | 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 |  |  | 76,358 |  |  |  | 109 |
Promissory notes issued by the Chilean Government and the Central Bank of Chile |  |  | 16,466 |  |  |  | — |
Other instruments |  |  | 16,238 |  |  |  | 163,491 |
Other instruments issued in Chile: |  |  |  |  |  |  |  |
Mortgage bonds from domestic banks |  |  | 122,291 |  |  |  | 128,763 |
Bonds from domestic banks |  |  | 15,927 |  |  |  | 15,887 |
Deposits from domestic banks |  |  | 1,020,842 |  |  |  | 685,392 |
Bonds from other Chilean companies |  |  | 1,395 |  |  |  | 34,539 |
Other instruments |  |  | 68,476 |  |  |  | 32,342 |
Instruments issued by foreign institutions: |  |  |  |  |  |  |  |
Other instruments |  |  | 19,853 |  |  |  | — |
Total |  |  | 1,357,846 |  |  |  | 1,060,523 |
Schedule of credit ratings of the issuers of debt instruments |
|  | As of December 31, 2019 |  |  | As of December 31, 2020 |
|  | 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 |  |  | 1,269,516 |  |  |  | — |  |  |  | — |  |  |  | 1,269,516 |  |  |  | 1,027,965 |  |  |  | 216 |  |  |  | — |  |  |  | 1,028,181 |
Non-investment grade |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Without rating |  |  | 88,330 |  |  |  | — |  |  |  | — |  |  |  | 88,330 |  |  |  | 32,342 |  |  |  | — |  |  |  | — |  |  |  | 32,342 |
Total |  |  | 1,357,846 |  |  |  | — |  |  |  | — |  |  |  | 1,357,846 |  |  |  | 1,060,307 |  |  |  | 216 |  |  |  | — |  |  |  | 1,060,523 |
Schedule of changes in the corresponding ECLs of debt instrument |
|  | Stage 1 Individual |  |  | Stage 2 Individual |  |  | Stage 3 Individual |  |  | Total |
|  | Fair value |  |  | ECL |  |  | Fair value |  |  | ECL |  |  | Fair value |  |  | ECL |  |  | Fair value |  |  | ECL |
|  | MCh$ |  |  | MCh$ |  |  | MCh$ |  |  | MCh$ |  |  | MCh$ |  |  | MCh$ |  |  | MCh$ |  |  | MCh$ |
Balance as of January 1, 2019 |  |  | 1,043,440 |  |  |  | 4,268 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,043,440 |  |  |  | 4,268 |
Net change on Balance * |  |  | 275,797 |  |  |  | 327 |  |  |  | (19 | ) |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | 275,778 |  |  |  | 326 |
Change in fair value |  |  | 32,995 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 32,995 |  |  |  | — |
Transfer to Stage 1 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Transfer to Stage 2 |  |  | (19 | ) |  |  | (1 | ) |  |  | 19 |  |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
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 |  |  | — |  |  |  | 3,102 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 3,102 |
Amounts written off |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Foreign exchange adjustments |  |  | 5,633 |  |  |  | 40 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,633 |  |  |  | 40 |
Balance as of December 31, 2019 |  |  | 1,357,846 |  |  |  | 7,736 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,357,846 |  |  |  | 7,736 |
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 |
Schedule of breakdown of the balance under the heading Equity instruments at fair value through OCI |
|  | 2019 |  |  | 2020 |
|  | MCh$ |  |  | MCh$ |
Equity instruments issued in Chile |  |  | 7,446 |  |  |  | 6,869 |
Equity instruments issued by foreign institutions |  |  | 1,051 |  |  |  | 761 |
Total |  |  | 8,497 |  |  |  | 7,630 |
Schedule of unrealised gain and loss on available for sale investments |
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | MCh$ |  |  | MCh$ |  |  | MCh$ |
Net gain (loss) on financial assets before income tax (1) |  |  | (13,878 | ) |  |  | 15,969 |  |  |  | (8,540 | )
Tax (expense) benefit |  |  | 3,757 |  |  |  | (4,328 | ) |  |  | 2,304 |
Net of tax amount (2) |  |  | (10,121 | ) |  |  | 11,641 |  |  |  | (6,236 | )

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