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Loans to Customers, net - Loans by industry sector (Details) $ in Thousands, $ in Millions | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CLP ($) | Dec. 31, 2016 CLP ($) | Dec. 31, 2015 CLP ($)
--- | --- | --- | --- | ---
Financial instrument disclosures |  |  |  |
Loans to customers | $ 40,550,009 | $ 24,955,692 | $ 24,843,655 | $ 24,022,983
Nominal value of loans acquired |  | 1,495 | 54,969 |
Commercial loans |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | 13,739,589 | 14,226,761 | 14,101,661
Residential mortgage loans |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | 7,445,221 | 6,892,019 | 6,374,981
Consumer loans |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | 3,770,882 | 3,724,875 | 3,546,341
Gross Balance |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 25,451,513 | $ 25,398,424 | 24,573,426
% | 100.00% | 100.00% | 100.00% |
Gross Balance | Domestic banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 25,393,211 | $ 25,288,046 |
Gross Balance | Foreign banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | 58,302 | 110,378 |
Gross Balance | Commercial loans |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 13,960,818 | $ 14,499,035 | 14,421,165
% | 54.85% | 54.85% | 57.09% |
Gross Balance | Commercial loans | Domestic banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 13,902,516 | $ 14,388,657 |
Gross Balance | Commercial loans | Foreign banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | 58,302 | 110,378 |
Gross Balance | Commerce |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 2,035,129 | $ 2,243,474 |
% | 7.99% | 7.99% | 8.83% |
Gross Balance | Commerce | Domestic banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 2,013,411 | $ 2,191,018 |
Gross Balance | Commerce | Foreign banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | 21,718 | 52,456 |
Gross Balance | Services |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 1,964,238 | $ 1,937,428 |
% | 7.72% | 7.72% | 7.63% |
Gross Balance | Services | Domestic banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 1,964,238 | $ 1,937,428 |
Gross Balance | Financial services |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 1,851,649 | $ 2,116,203 |
% | 7.27% | 7.27% | 8.33% |
Gross Balance | Financial services | Domestic banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 1,845,464 | $ 2,102,582 |
Gross Balance | Financial services | Foreign banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | 6,185 | 13,621 |
Gross Balance | Transportation and telecommunications |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 1,612,930 | $ 1,636,994 |
% | 6.34% | 6.34% | 6.45% |
Gross Balance | Transportation and telecommunications | Domestic banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 1,612,930 | $ 1,636,994 |
Gross Balance | Construction |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 1,493,373 | $ 1,647,862 |
% | 5.87% | 5.87% | 6.49% |
Gross Balance | Construction | Domestic banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 1,493,373 | $ 1,647,862 |
Gross Balance | Manufacturing |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 1,399,692 | $ 1,561,737 |
% | 5.50% | 5.50% | 6.15% |
Gross Balance | Manufacturing | Domestic banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 1,369,293 | $ 1,517,436 |
Gross Balance | Manufacturing | Foreign banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | 30,399 | 44,301 |
Gross Balance | Agriculture and livestock |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 1,354,069 | $ 1,184,869 |
% | 5.32% | 5.32% | 4.67% |
Gross Balance | Agriculture and livestock | Domestic banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 1,354,069 | $ 1,184,869 |
Gross Balance | Electricity, gas and water |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 565,695 | $ 566,438 |
% | 2.22% | 2.22% | 2.23% |
Gross Balance | Electricity, gas and water | Domestic banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 565,695 | $ 566,438 |
Gross Balance | Mining |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 422,176 | $ 432,822 |
% | 1.66% | 1.66% | 1.70% |
Gross Balance | Mining | Domestic banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 422,176 | $ 432,822 |
Gross Balance | Fishing |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 145,266 | $ 264,042 |
% | 0.57% | 0.57% | 1.04% |
Gross Balance | Fishing | Domestic banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 145,266 | $ 264,042 |
Gross Balance | Other |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 1,116,601 | $ 907,166 |
% | 4.39% | 4.39% | 3.57% |
Gross Balance | Other | Domestic banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 1,116,601 | $ 907,166 |
Gross Balance | Residential mortgage loans |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 7,477,236 | $ 6,924,766 | 6,404,986
% | 29.38% | 29.38% | 27.26% |
Gross Balance | Residential mortgage loans | Domestic banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 7,477,236 | $ 6,924,766 |
Gross Balance | Consumer loans |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 4,013,459 | $ 3,974,623 | $ 3,747,275
% | 15.77% | 15.77% | 15.65% |
Gross Balance | Consumer loans | Domestic banks |  |  |  |
Financial instrument disclosures |  |  |  |
Loans to customers |  | $ 4,013,459 | $ 3,974,623 |

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