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Derivative Instruments and Accounting Hedges - Bank's Portfolio of Derivative Instruments (Details) - CLP ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |
Fair value assets | $ 2,786,215 | $ 1,513,947
Fair value liabilities | 2,818,421 | 1,528,234
Cross currency swap and interest rate swap |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount - trading | 18,575,756 | 13,982,890
Fair value assets - trading | 873,371 | 450,519
Fair value liabilities - trading | 1,210,059 | 569,868
Cross currency swap and interest rate swap | Fair value hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount - hedging | 8,166 | 11,132
Fair value assets - hedging |  |
Fair value liabilities - hedging | 2,547 | 3,012
Notional amount | 8,166 | 11,132
Interest rate swap |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount - trading | 61,411,254 | 72,330,827
Fair value assets - trading | 888,581 | 287,611
Fair value liabilities - trading | 886,963 | 284,840
Interest rate swap | Fair value hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount - hedging | 86,317 | 226,954
Fair value assets - hedging | 32 | 1,116
Fair value liabilities - hedging | 6,739 | 3,152
Notional amount | 86,317 | 226,954
Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount - trading | 114,823,568 | 122,425,909
Fair value assets - trading | 2,724,621 | 1,478,533
Fair value liabilities - trading | 2,774,692 | 1,490,252
Notional amount | 116,099,933 | 123,801,452
Fair value assets | 2,786,215 | 1,513,947
Fair value liabilities | 2,818,421 | 1,528,234
Derivatives | Fair value hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount - hedging | 94,483 | 238,086
Fair value assets - hedging | 32 | 1,116
Fair value liabilities - hedging | 9,286 | 6,164
Derivatives | Cash flow hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount - hedging | 1,181,882 | 1,137,457
Fair value assets - hedging | 61,562 | 34,298
Fair value liabilities - hedging | 34,443 | 31,818
Swaps | Cash flow hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount - hedging | 1,181,882 | 1,137,457
Fair value assets - hedging | 61,562 | 34,298
Fair value liabilities - hedging | 34,443 | 31,818
Currency forward |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount - trading | 34,499,472 | 35,690,464
Fair value assets - trading | 956,632 | 735,444
Fair value liabilities - trading | 673,932 | 631,089
Call Options |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount - trading | 178,414 | 229,175
Fair value assets - trading | 4,961 | 4,839
Fair value liabilities - trading | 1,529 | 2,921
Put Options |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount - trading | 158,672 | 192,553
Fair value assets - trading | 1,076 | 120
Fair value liabilities - trading | $ 2,209 | $ 1,534

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