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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, 2017
Dec. 31, 2016
Assets    
Cash and due from banks $ 57,563 $ 51,222
Transactions in the course of collection 13,249 7,537
Derivative instruments 323,186 147,046
Financial assets   15,115
Other assets 114,536 50,691
Total 508,534 271,611
Liabilities    
Demand deposits 173,715 194,503
Transactions in the course of payment 16,116 5,637
Cash collateral on securities lent and repurchase agreements 25,227 34,710
Savings accounts and time deposits 169,322 267,925
Derivative instruments 370,356 151,398
Borrowings from financial institutions 251,555 242,405
Other liabilities 51,814 60,307
Total 1,058,105 956,885
Type of income or expense recognized    
Interest and revenue income 28,140 19,354
Interest and revenue expense 9,332 15,941
Fees and commission income 65,995 66,387
Fees and commission expense 69,843 62,614
Derivative instruments income 33,540 33,814
Derivative instruments expense 97,416 42,898
Other financial operations income 1  
Provision for credit risk income   290
Provision for credit risk expense 252  
Operating expenses 100,389 85,979
Other income 3,723 458
Other expense 56 32
Comder Contraparte Central S.A    
Type of income or expense recognized    
Net loss $ 96,075 $ 31,649