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Financial Assets at Fair Value through Other Comprehensive Income (Tables)

12 Months Ended

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	)