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Financial Assets at Fair Value through Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2019
Available-for-sale financial assets [abstract] |
Schedule of financial assets |
|  | 2018 |  |  | 2019 |
|  | MCh$ |  |  | MCh$ |
Debt instruments at fair value through OCI |  |  | 1,043,440 |  |  |  | 1,357,846 |
Equity instruments valued at fair value through OCI |  |  | 9,751 |  |  |  | 8,497 |
Total |  |  | 1,053,191 |  |  |  | 1,366,343 |
Schedule of breakdown of the balance under the heading "Debt instruments at fair value through OCI |
|  | 2018 |  |  | 2019 |
|  | MCh$ |  |  | MCh$ |
Instruments issued by the Chilean Government and Central Bank: |  |  |  |  |  |
Bonds issued by the Chilean Government and Central Bank |  |  | 135,145 |  |  |  | 76,358 |
Promissory notes issued by the Chilean Government and Central Bank |  |  | — |  |  |  | 16,466 |
Other instruments |  |  | 29,077 |  |  |  | 16,238 |
Other instruments issued in Chile: |  |  |  |  |  |  |  |
Mortgage bonds from domestic banks |  |  | 92,491 |  |  |  | 122,291 |
Bonds from domestic banks |  |  | 5,351 |  |  |  | 15,927 |
Deposits from domestic banks |  |  | 559,108 |  |  |  | 1,020,842 |
Bonds from other Chilean companies |  |  | 6,599 |  |  |  | 1,395 |
Other instruments |  |  | 107,125 |  |  |  | 68,476 |
Instruments issued by foreign institutions: |  |  |  |  |  |  |  |
Other instruments |  |  | 108,544 |  |  |  | 19,853 |
Total |  |  | 1,043,440 |  |  |  | 1,357,846 |
Schedule of credit ratings of the issuers of debt instruments |
|  | As of December 31, 2018 |  |  | As of December 31, 2019 |
|  | 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 |  |  | 827,770 |  |  |  | — |  |  |  | — |  |  |  | 827,770 |  |  |  | 1,269,516 |  |  |  | — |  |  |  | — |  |  |  | 1,269,516 |
Non-investment grade |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Without rating |  |  | 215,670 |  |  |  | — |  |  |  | — |  |  |  | 215,670 |  |  |  | 88,330 |  |  |  | — |  |  |  | — |  |  |  | 88,330 |
Total |  |  | 1,043,440 |  |  |  | — |  |  |  | — |  |  |  | 1,043,440 |  |  |  | 1,357,846 |  |  |  | — |  |  |  | — |  |  |  | 1,357,846 |
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, 2018 |  |  | 1,516,063 |  |  |  | 5,820 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,516,063 |  |  |  | 5,820 |
Net change on Balance * |  |  | (515,343 | ) |  |  | (1,978 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (515,343 | ) |  |  | (1,978 | )
Change in fair value |  |  | 14,162 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 14,162 |  |  |  | — |
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 ** |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Impact of net re-measurement of year-end ECL |  |  | — |  |  |  | 258 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 258 |
Amounts written off |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Foreign exchange adjustments |  |  | 28,558 |  |  |  | 168 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 28,558 |  |  |  | 168 |
Balance as of December 31, 2018 |  |  | 1,043,440 |  |  |  | 4,268 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,043,440 |  |  |  | 4,268 |
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 |
| * | Net change between assets purchased and assets derecognized, excluding write offs.
| ** | Represents the change in the year-end ECLs of exposures that were transferred from one stage to another during the year.
Schedule of breakdown of the balance under the heading "Equity instruments at fair value through OCI" |
|  | 2018 |  |  | 2019 |
|  | MCh$ |  |  | MCh$ |
Equity instruments issued in Chile |  |  | 8,939 |  |  |  | 7,446 |
Equity instruments issued by foreign institutions |  |  | 812 |  |  |  | 1,051 |
Total |  |  | 9,751 |  |  |  | 8,497 |
Schedule of unrealised gain and loss on available for sale investments |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | MCh$ |  |  | MCh$ |  |  | MCh$ |
Net gain (loss) on financial assets before income tax (1) |  |  | 4,775 |  |  |  | (13,878 | ) |  |  | 15,969 |
Tax (expense) benefit |  |  | (1,299 | ) |  |  | 3,757 |  |  |  | (4,328 | )
Net of tax amount (2) |  |  | 3,476 |  |  |  | (10,121 | ) |  |  | 11,641 |
| (1) | As of December 31, 2017, 2018 and 2019, realized gains reclassified to the income statement line item "Net financial operating income" amounted to Ch$5,149 million, Ch$400 million and Ch$4,716 million, respectively.
| (2) | This amount corresponds to the unrealized gain or loss, net of deferred tax and which are included in "Consolidated Statement of Changes in Equity".

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