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Loans to Customers at Amortized Cost - Credit quality and the maximum exposure to credit risk (Details) - CLP ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]    
Total $ 30,033,272 $ 27,926,632
Normal [Member]    
Statement Line Items [Line Items]    
Commercial loans 15,800,666 14,969,565
Mortgage loans 9,031,624 7,887,217
Consumer loans 4,241,342 4,166,767
Substandard [Member]    
Statement Line Items [Line Items]    
Commercial loans 71,718 94,894
Non-complying [Member]    
Statement Line Items [Line Items]    
Commercial loans 421,828 373,939
Mortgage loans 175,103 164,856
Consumer loans 290,991 269,394
Subtotal [Member]    
Statement Line Items [Line Items]    
Commercial loans 16,294,212 15,438,398
Mortgage loans 9,206,727 8,052,073
Consumer loans 4,532,333 4,436,161
Stage 1 [Member] | Individual [Member]    
Statement Line Items [Line Items]    
Total 9,880,799 9,426,420
Stage 1 [Member] | Individual [Member] | Normal [Member]    
Statement Line Items [Line Items]    
Commercial loans 9,880,799 9,426,420
Mortgage loans
Consumer loans
Stage 1 [Member] | Individual [Member] | Substandard [Member]    
Statement Line Items [Line Items]    
Commercial loans
Stage 1 [Member] | Individual [Member] | Non-complying [Member]    
Statement Line Items [Line Items]    
Commercial loans
Mortgage loans
Consumer loans
Stage 1 [Member] | Individual [Member] | Subtotal [Member]    
Statement Line Items [Line Items]    
Commercial loans 9,880,799 9,426,420
Mortgage loans
Consumer loans
Stage 1 [Member] | Group [Member]    
Statement Line Items [Line Items]    
Total 15,439,567 13,109,173
Stage 1 [Member] | Group [Member] | Normal [Member]    
Statement Line Items [Line Items]    
Commercial loans 3,369,494 3,049,264
Mortgage loans 8,209,100 6,893,619
Consumer loans 3,860,973 3,166,290
Stage 1 [Member] | Group [Member] | Substandard [Member]    
Statement Line Items [Line Items]    
Commercial loans
Stage 1 [Member] | Group [Member] | Non-complying [Member]    
Statement Line Items [Line Items]    
Commercial loans
Mortgage loans
Consumer loans
Stage 1 [Member] | Group [Member] | Subtotal [Member]    
Statement Line Items [Line Items]    
Commercial loans 3,369,494 3,049,264
Mortgage loans 8,209,100 6,893,619
Consumer loans 3,860,973 3,166,290
Stage 2 [Member] | Individual [Member]    
Statement Line Items [Line Items]    
Total 2,059,481 2,134,848
Stage 2 [Member] | Individual [Member] | Normal [Member]    
Statement Line Items [Line Items]    
Commercial loans 1,987,763 2,039,954
Mortgage loans
Consumer loans
Stage 2 [Member] | Individual [Member] | Substandard [Member]    
Statement Line Items [Line Items]    
Commercial loans 71,718 94,894
Stage 2 [Member] | Individual [Member] | Non-complying [Member]    
Statement Line Items [Line Items]    
Commercial loans
Mortgage loans
Consumer loans
Stage 2 [Member] | Individual [Member] | Subtotal [Member]    
Statement Line Items [Line Items]    
Commercial loans 2,059,481 2,134,848
Mortgage loans
Consumer loans
Stage 2 [Member] | Group [Member]    
Statement Line Items [Line Items]    
Total 1,757,169 2,429,234
Stage 2 [Member] | Group [Member] | Normal [Member]    
Statement Line Items [Line Items]    
Commercial loans 561,831 447,225
Mortgage loans 822,524 993,085
Consumer loans 372,814 975,898
Stage 2 [Member] | Group [Member] | Substandard [Member]    
Statement Line Items [Line Items]    
Commercial loans
Stage 2 [Member] | Group [Member] | Non-complying [Member]    
Statement Line Items [Line Items]    
Commercial loans 13,026
Mortgage loans
Consumer loans
Stage 2 [Member] | Group [Member] | Subtotal [Member]    
Statement Line Items [Line Items]    
Commercial loans 561,831 460,251
Mortgage loans 822,524 993,085
Consumer loans 372,814 975,898
Stage 3 [Member] | Individual [Member]    
Statement Line Items [Line Items]    
Total 152,972 120,564
Stage 3 [Member] | Individual [Member] | Normal [Member]    
Statement Line Items [Line Items]    
Commercial loans
Mortgage loans
Consumer loans
Stage 3 [Member] | Individual [Member] | Substandard [Member]    
Statement Line Items [Line Items]    
Commercial loans
Stage 3 [Member] | Individual [Member] | Non-complying [Member]    
Statement Line Items [Line Items]    
Commercial loans 152,972 120,564
Mortgage loans
Consumer loans
Stage 3 [Member] | Individual [Member] | Subtotal [Member]    
Statement Line Items [Line Items]    
Commercial loans 152,972 120,564
Mortgage loans
Consumer loans
Stage 3 [Member] | Group [Member]    
Statement Line Items [Line Items]    
Total 741,560 705,778
Stage 3 [Member] | Group [Member] | Normal [Member]    
Statement Line Items [Line Items]    
Commercial loans 779 6,702
Mortgage loans 513
Consumer loans 7,555 24,579
Stage 3 [Member] | Group [Member] | Substandard [Member]    
Statement Line Items [Line Items]    
Commercial loans
Stage 3 [Member] | Group [Member] | Non-complying [Member]    
Statement Line Items [Line Items]    
Commercial loans 267,220 239,734
Mortgage loans 175,103 164,856
Consumer loans 290,903 269,394
Stage 3 [Member] | Group [Member] | Subtotal [Member]    
Statement Line Items [Line Items]    
Commercial loans 267,999 246,436
Mortgage loans 175,103 165,369
Consumer loans 298,458 293,973
POCI [Member]    
Statement Line Items [Line Items]    
Total 1,724 615
POCI [Member] | Normal [Member]    
Statement Line Items [Line Items]    
Commercial loans
Mortgage loans
Consumer loans
POCI [Member] | Substandard [Member]    
Statement Line Items [Line Items]    
Commercial loans
POCI [Member] | Non-complying [Member]    
Statement Line Items [Line Items]    
Commercial loans 1,636 615
Mortgage loans
Consumer loans 88
POCI [Member] | Subtotal [Member]    
Statement Line Items [Line Items]    
Commercial loans 1,636 615
Mortgage loans
Consumer loans $ 88