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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)