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Loans and Advances to Banks, Net - Credit quality and the maximum exposure to credit risk (Details) - CLP ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]    
Normal $ 150,007 $ 100,023
Substandard
Non-complying
Subtotal 150,007 100,023
Normal 360,131 294,542
Substandard
Non-complying
Subtotal 360,131 294,542
Normal 630,053 1,100,831
Substandard
Non-complying
Subtotal 630,053 1,100,831
Total 1,140,191 1,495,396
Stage 1 [Member] | Individual [Member]    
Statement Line Items [Line Items]    
Normal 150,007 100,023
Substandard
Non-complying
Subtotal 150,007 100,023
Normal 238,491 266,648
Substandard
Non-complying
Subtotal 238,491 266,648
Normal 630,053 1,100,831
Substandard
Non-complying
Subtotal 630,053 1,100,831
Total 1,018,551 1,467,502
Stage 2 [Member] | Individual [Member]    
Statement Line Items [Line Items]    
Normal
Substandard
Non-complying
Subtotal
Normal 121,640 27,894
Substandard
Non-complying
Subtotal 121,640 27,894
Normal
Substandard
Non-complying
Subtotal
Total 121,640 27,894
Stage 3 [Member] | Individual [Member]    
Statement Line Items [Line Items]    
Normal
Substandard
Non-complying
Subtotal
Normal
Substandard
Non-complying
Subtotal
Normal
Substandard
Non-complying
Subtotal
Total