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Interest Revenue and Expenses (Tables)
 12 Months Ended
Dec. 31, 2019
Interest Revenue and Expenses [abstract]  
Schedule of interest revenue

   2017   2018   2019 
   MCh$   MCh$   MCh$ 
Commercial loans   786,794    851,328    910,229 
Consumer loans   614,393    613,293    638,198 
Residential mortgage loans   401,862    502,832    532,009 
Financial investments   35,403    52,909    45,294 
Repurchase agreements   7,337    2,767    2,480 
Loans and advances to banks   15,024    24,138    27,457 
Gain (loss) from accounting hedges   20,722    (58,560)   (59,874)
Other interest revenue   5,165    11,910    17,755 
Total   1,886,700    2,000,617    2,113,548 
Schedule of interest expenses

   2017   2018   2019 
   MCh$   MCh$   MCh$ 
Savings accounts and time deposits   297,277    301,251    313,142 
Debt issued   268,203    352,351    386,015 
Other financial obligations   1,640    1,482    918 
Repurchase agreements   5,193    8,901    7,048 
Borrowings from financial institutions   19,255    29,275    43,570 
(Gain) loss from accounting hedges   54,834    (23,694)   (25,888)
Demand deposits   5,350    9,380    14,408 
Lease liabilities   —    —    2,574 
Other interest expenses   253    694    483 
Total   652,005    679,640    742,270 
Schedule of loss from accounting hedge

   2017   2018   2019 
   MCh$   MCh$   MCh$ 
Cash Flow hedge   (29,477)   (33,031)   (28,690)
Fair value hedge   (4,635)   (1,835)   (5,296)
Total   (34,112)   (34,866)   (33,986)