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FINANCIAL RISK MANAGEMENT - Sensitivity Analysis regarding Change in Interest Rates (Details) - Interest Rate Risk [Member]
S/ in Thousands
 12 Months Ended
Dec. 31, 2019
PEN (S/)
item
Dec. 31, 2018
PEN (S/)
item
Soles at 50 basis points change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Changes In Basis Points | item 50 50
Sensitivity Analysis, Net Profit S/ 7,696 S/ 10,463
Sensitivity Analysis, Net Economic Value S/ 520,389 S/ 439,964
Soles at 75 basis points change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Changes In Basis Points | item 75 75
Sensitivity Analysis, Net Profit S/ 11,544 S/ 15,695
Sensitivity Analysis, Net Economic Value S/ 780,584 S/ 659,946
Soles at 100 basis points change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Changes In Basis Points | item 100 100
Sensitivity Analysis, Net Profit S/ 15,392 S/ 20,926
Sensitivity Analysis, Net Economic Value S/ 1,040,778 S/ 879,928
Soles at 150 basis points change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Changes In Basis Points | item 150 150
Sensitivity Analysis, Net Profit S/ 23,088 S/ 31,389
Sensitivity Analysis, Net Economic Value S/ 1,561,167 S/ 1,319,893
US Dollar at 50 basis points change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Changes In Basis Points | item 50 50
Sensitivity Analysis, Net Profit S/ 52,276 S/ 48,325
Sensitivity Analysis, Net Economic Value S/ 50,253 S/ 6,718
US Dollar at 75 basis points change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Changes In Basis Points | item 75 75
Sensitivity Analysis, Net Profit S/ 78,413 S/ 72,487
Sensitivity Analysis, Net Economic Value S/ 75,379 S/ 10,078
US Dollar at 100 basis points change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Changes In Basis Points | item 100 100
Sensitivity Analysis, Net Profit S/ 104,551 S/ 96,650
Sensitivity Analysis, Net Economic Value S/ 100,506 S/ 13,437
US Dollar at 150 basis points change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Changes In Basis Points | item 150 150
Sensitivity Analysis, Net Profit S/ 156,827 S/ 144,975
Sensitivity Analysis, Net Economic Value S/ 150,759 S/ 20,155