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Interest Revenue and Expenses (Details) $ in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 CLP ($) | Dec. 31, 2016 CLP ($) | Dec. 31, 2015 CLP ($)
Interest revenue |  |  |  |
Commercial loans |  | $ 786,794 | $ 856,172 | $ 852,202
Consumer loans |  | 614,393 | 613,962 | 573,306
Residential mortgage loans |  | 401,862 | 447,582 | 469,633
Financial investments |  | 35,403 | 30,725 | 62,860
Repurchase agreements |  | 7,337 | 9,053 | 9,389
Loans and advances to banks |  | 15,024 | 32,280 | 28,267
Gain (loss) from accounting hedges |  | 20,722 | (76,378) | (90,620)
Other interest revenue |  | 5,165 | 3,596 | 3,420
Total | $ 3,065,661 | 1,886,700 | 1,916,992 | 1,908,457
Interest income from impaired loans |  | 6,426 | 5,629 |
Interest expenses |  |  |  |
Savings accounts and time deposits |  | 297,277 | 376,541 | 341,955
Debt issued |  | 268,203 | 309,589 | 329,111
Other financial obligations |  | 1,640 | 1,916 | 2,249
Repurchase agreements |  | 5,193 | 6,223 | 7,216
Borrowings from financial institutions |  | 19,255 | 13,504 | 10,171
(Gain) loss from accounting hedges |  | 54,834 | (24,190) | (20,256)
Demand deposits |  | 5,350 | 6,241 | 8,658
Other interest expenses |  | 253 | 435 | 1,065
Total | $ 1,059,430 | 652,005 | 690,259 | 680,169
Loss from accounting hedge |  |  |  |
Cash Flow hedge |  | (29,477) | (45,559) | (64,821)
Fair value hedge |  | (4,635) | (6,629) | (5,543)
Total |  | $ (34,112) | $ (52,188) | $ (70,364)

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