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Risk Management - Collateral and Other Enhancements (Details) $ in Millions | Dec. 31, 2017 CLP ($) item | Dec. 31, 2016 CLP ($)
--- | --- | ---
Guarantee values |  |
Number of collaterals | item | 215,400 |
Fair value of loans covered by collateral |  |
Value of guarantees, classified as impaired | $ 102,014 | $ 129,066
Value of guarantees, classified as non-impaired | 358,967 | 305,666
Loans to customers |  |
Guarantee values |  |
Maximum exposure to credit risk | 25,451,513 | 25,398,424
Fair value of loans covered by collateral |  |
Mortgages | 12,018,604 | 11,214,767
Pledge | 102,620 | 102,769
Securities | 472,672 | 472,490
Warrants | 3,381 | 3,493
Others | 320,810 | 421,446
Net collateral | 12,918,087 | 12,214,965
Net exposure | 12,533,426 | 13,183,459
Corporate lending |  |
Guarantee values |  |
Maximum exposure to credit risk | 9,775,740 | 10,663,260
Fair value of loans covered by collateral |  |
Mortgages | 2,269,716 | 2,240,502
Pledge | 72,893 | 69,466
Securities | 438,595 | 442,285
Warrants | 3,381 | 3,493
Others | 243,961 | 349,560
Net collateral | 3,028,546 | 3,105,306
Net exposure | 6,747,194 | 7,557,954
Small business loans |  |
Guarantee values |  |
Maximum exposure to credit risk | 4,185,078 | 3,835,775
Fair value of loans covered by collateral |  |
Mortgages | 2,543,343 | 2,301,924
Pledge | 28,699 | 32,138
Securities | 32,034 | 27,461
Others | 58,255 | 54,534
Net collateral | 2,662,331 | 2,416,057
Net exposure | 1,522,747 | 1,419,718
Consumer loans |  |
Guarantee values |  |
Maximum exposure to credit risk | 4,013,459 | 3,974,623
Fair value of loans covered by collateral |  |
Mortgages | 283,091 | 252,984
Pledge | 938 | 1,096
Securities | 1,776 | 2,492
Others | 18,594 | 17,352
Net collateral | 304,399 | 273,924
Net exposure | 3,709,060 | 3,700,699
Residential mortgage loans |  |
Guarantee values |  |
Maximum exposure to credit risk | 7,477,236 | 6,924,766
Fair value of loans covered by collateral |  |
Mortgages | 6,922,454 | 6,419,357
Pledge | 90 | 69
Securities | 267 | 252
Net collateral | 6,922,811 | 6,419,678
Net exposure | $ 554,425 | $ 505,088

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