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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 |

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