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Provisions for Loan Losses (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CLP ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Provisions established:        
Individual provisions   $ (2,608) $ (5) $ (5,944)
Group provisions   (310,492) (303,139) (314,232)
Provisions established net   (313,100) (303,144) (320,176)
Provisions released:        
Individual provisions   871 32,412 10,593
Group provisions   327   3,478
Provisions released net   1,198 32,412 14,071
Recovery of written-off assets   60,579 49,477 46,842
Provisions net allowances for credit risk $ (362,346) (251,323) (221,255) (259,263)
Loans and advances to banks, net        
Provisions established:        
Individual provisions   (240) (5)  
Provisions established net   (240) (5)  
Provisions released:        
Individual provisions       94
Provisions released net       94
Provisions net allowances for credit risk   (240) (5) 94
Loans to customer and loans and advances to banks Consolidated Statement of Cash Flow        
Allowances established of loans to customer   (310,732) (300,013) (314,232)
Allowances released of loans to customer   871 28,571 8,018
Total allowances of loans to customer   (309,861) (271,442) (306,214)
Total Loans to customers        
Provisions established:        
Group provisions   (310,492) (300,008) (314,232)
Provisions established net   (310,492) (300,008) (314,232)
Provisions released:        
Individual provisions   871 28,571 7,924
Provisions released net   871 28,571 7,924
Recovery of written-off assets   60,579 49,477 46,842
Provisions net allowances for credit risk   (249,042) (221,960) (259,466)
Commercial loans        
Provisions established:        
Group provisions   (61,702) (47,837) (45,462)
Provisions established net   (61,702) (47,837) (45,462)
Provisions released:        
Individual provisions   871 28,571 7,924
Provisions released net   871 28,571 7,924
Recovery of written-off assets   13,579 13,750 13,017
Provisions net allowances for credit risk   (47,252) (5,516) (24,521)
Mortgage loans        
Provisions established:        
Group provisions   (7,546) (4,361) (6,932)
Provisions established net   (7,546) (4,361) (6,932)
Provisions released:        
Recovery of written-off assets   4,572 3,246 2,350
Provisions net allowances for credit risk   (2,974) (1,115) (4,582)
Consumer loans        
Provisions established:        
Group provisions   (241,244) (247,810) (261,838)
Provisions established net   (241,244) (247,810) (261,838)
Provisions released:        
Recovery of written-off assets   42,428 32,481 31,475
Provisions net allowances for credit risk   (198,816) (215,329) (230,363)
Provisions for contingent loan risks        
Provisions established:        
Individual provisions   (2,368)   (5,944)
Group provisions     (3,131)  
Provisions established net   (2,368) (3,131) (5,944)
Provisions released:        
Individual provisions     3,841 2,575
Group provisions   327   3,478
Provisions released net   327 3,841 6,053
Provisions net allowances for credit risk   $ (2,041) $ 710 $ 109