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Interest Revenue and Expenses (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CLP ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Interest revenue        
Commercial loans   $ 851,328 $ 786,794 $ 856,172
Consumer loans   613,293 614,393 613,962
Residential mortgage loans   502,832 401,862 447,582
Financial investments   52,909 35,403 30,725
Repurchase agreements   2,767 7,337 9,053
Loans and advances to banks   24,138 15,024 32,280
Gain (loss) from accounting hedges   (58,560) 20,722 (76,378)
Other interest revenue   11,910 5,165 3,596
Total $ 2,884,396 2,000,617 1,886,700 1,916,992
Interest received basis for impaired portfolio   5,113 6,426  
Interest expenses        
Savings accounts and time deposits   301,251 297,277 376,541
Debt issued   352,351 268,203 309,589
Other financial obligations   1,482 1,640 1,916
Repurchase agreements   8,901 5,193 6,223
Borrowings from financial institutions   29,275 19,255 13,504
(Gain) loss from accounting hedges   (23,694) 54,834 (24,190)
Demand deposits   9,380 5,350 6,241
Other interest expenses   694 253 435
Total $ 979,873 679,640 652,005 690,259
Loss from accounting hedge        
Total   (34,866) (34,112) (52,188)
Cash Flow hedge        
Loss from accounting hedge        
Cash Flow hedge   (33,031) (29,477) (45,559)
Fair value hedge        
Loss from accounting hedge        
Fair value hedge   $ (1,835) $ (4,635) $ (6,629)