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Provisions for Loan Losses (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Provisions established:      
Individual provisions $ (20,611) $ (2,608) $ (5)
Group provisions (362,619) (310,492) (303,139)
Provisions established net (383,230) (313,100) (303,144)
Provisions released:      
Individual provisions 3,654 2,423 32,412
Group provisions 327
Provisions released net 3,654 2,750 32,412
Recovery of written-off assets 47,975 60,579 49,477
Provisions net allowances for credit risk (331,601) (249,771) (221,255)
Loans and advances to banks, net      
Provisions established:      
Individual provisions (240) (5)
Group provisions
Provisions established net (240) (5)
Provisions released:      
Individual provisions 902
Group provisions
Provisions released net 902
Recovery of written-off assets
Provisions net allowances for credit risk 902 (240) (5)
Loans to customer and loans and advances to banks Consolidated Statement of Cash Flow      
Allowances established of loans to customer (377,055) (310,732) (300,013)
Allowances released of loans to customer 902 871 28,571
Total allowances of loans to customer (376,153) (309,861) (271,442)
Commercial loans      
Provisions established:      
Individual provisions (17,143)
Group provisions (64,492) (61,702) (47,837)
Provisions established net (81,635) (61,702) (47,837)
Provisions released:      
Individual provisions 871 28,571
Group provisions
Provisions released net 871 28,571
Recovery of written-off assets 12,253 13,579 13,750
Provisions net allowances for credit risk (69,382) (47,252) (5,516)
Mortgage loans      
Provisions established:      
Individual provisions
Group provisions (17,168) (7,546) (4,361)
Provisions established net (17,168) (7,546) (4,361)
Provisions released:      
Individual provisions
Group provisions
Provisions released net
Recovery of written-off assets 5,114 4,572 3,246
Provisions net allowances for credit risk (12,054) (2,974) (1,115)
Consumer loans      
Provisions established:      
Individual provisions
Group provisions (278,252) (241,244) (247,810)
Provisions established net (278,252) (241,244) (247,810)
Provisions released:      
Individual provisions
Group provisions
Provisions released net
Recovery of written-off assets 30,608 42,428 32,481
Provisions net allowances for credit risk (247,644) (198,816) (215,329)
Total Loans to customers      
Provisions established:      
Individual provisions (17,143)
Group provisions (359,912) (310,492) (300,008)
Provisions established net (377,055) (310,492) (300,008)
Provisions released:      
Individual provisions 871 28,571
Group provisions
Provisions released net 871 28,571
Recovery of written-off assets 47,975 60,579 49,477
Provisions net allowances for credit risk (329,080) (249,042) (221,960)
Debt Instruments at fair value Through OCI [Member]      
Provisions established:      
Individual provisions (3,468)
Group provisions
Provisions established net (3,468)
Provisions released:      
Individual provisions 1,552
Group provisions
Provisions released net 1,552
Recovery of written-off assets
Provisions net allowances for credit risk (3,468) 1,552
Provisions for contingent loan risks      
Provisions established:      
Individual provisions (2,368)
Group provisions (2,707) (3,131)
Provisions established net (2,707) (2,368) (3,131)
Provisions released:      
Individual provisions 2,752 3,841
Group provisions 327
Provisions released net 2,752 327 3,841
Recovery of written-off assets
Provisions net allowances for credit risk $ 45 $ (2,041) $ 710