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Related Party Transactions (Other assets and liabilities, Income and expenses with related parties) (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets      
Cash and due from banks $ 99,802 $ 23,086  
Transactions in the course of collection 63,969 35,469  
Financial assets held-for-trading 880 205  
Derivative instruments 495,378 415,683  
Investment instruments 12,141 14,690  
Other assets 76,548 80,569  
Total 748,718 569,702  
Liabilities      
Demand deposits 227,377 169,607  
Transactions in the course of payment 16,202 58,987  
Obligations under repurchase agreements 54,030 84,465  
Savings accounts and time deposits 396,028 219,322  
Derivative instruments 432,669 337,299  
Borrowings from financial institutions 292,172 228,269  
Lease liabilities 5,138  
Other liabilities 151,335 115,145  
Total 1,574,951 1,213,094  
Type of income or expense recognized      
Interest and revenue income 19,039 21,736 $ 26,485
Interest and revenue expense 2,619 7,196 9,332
Fees and commission income 72,931 70,286 65,995
Fees and commission expense 65,383 74,205 69,843
Derivative instruments income [1] 124,967 85,500 33,540
Derivative instruments expense [1] 73,252 42,365 97,416
Other financial operations income 87 1
Other financial operations expenses 119    
Release or established of provision for credit risk expense 106 34 252
Operating expenses 120,559 105,734 100,389
Other income 542 446 3,723
Other expense $ 26 $ 45 $ 56
[1] The outcome of derivative operations is presented net at each related counterparty level. Additionally, this line includes operations with local counterpart banks (unrelated) which have been novated by Comder Contraparte Central S.A. (Related entity) for centralized clearing purposes, which generated a net gain of Ch$123,461 million as of December 31, 2019 (net gain of Ch$71,297 million as of December 31, 2018 and net loss of Ch$96,075 as of December 31, 2017).