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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, 2018
Dec. 31, 2017
Assets    
Cash and due from banks $ 23,086 $ 57,563
Transactions in the course of collection 35,469 13,249
Financial assets held-for-trading 205  
Derivative instruments 415,683 323,186
Financial assets 14,690  
Other assets 80,569 114,536
Total 569,702 508,534
Liabilities    
Demand deposits 169,607 173,715
Transactions in the course of payment 58,987 16,116
Cash collateral on securities lent and repurchase agreements 84,465 25,227
Savings accounts and time deposits 124,362 169,322
Derivative instruments 337,299 370,356
Borrowings from financial institutions 228,269 251,555
Other liabilities 115,145 51,814
Total 1,118,134 1,058,105
Type of income or expense recognized    
Interest and revenue income 21,736 26,485
Interest and revenue expense 7,196 9,332
Fees and commission income 70,286 65,995
Fees and commission expense 74,205 69,843
Derivative instruments income 85,500 33,540
Derivative instruments expense 42,365 97,416
Other financial operations income   1
Release or established of provision for credit risk expense 28 252
Operating expenses 105,734 100,389
Other income 446 3,723
Other expense 45 56
Comder Contraparte Central S.A    
Type of income or expense recognized    
Net loss $ 71,297 $ 96,075