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FINANCIAL RISK MANAGEMENT (Details 12) - Interest Rate Risk [Member]
S/ in Thousands
 12 Months Ended
Dec. 31, 2018
PEN (S/)
BasisPoints
Dec. 31, 2017
PEN (S/)
BasisPoints
Soles at 50 basis points change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Changes In Basis Points | BasisPoints 50 50
Sensitivity Analysis, Net Profit S/ 10,463 S/ 1,451
Sensitivity Analysis, Net Economic Value S/ 439,964 S/ 354,899
Soles at 75 basis points change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Changes In Basis Points | BasisPoints 75 75
Sensitivity Analysis, Net Profit S/ 15,695 S/ 2,176
Sensitivity Analysis, Net Economic Value S/ 659,946 S/ 532,348
Soles at 100 basis points change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Changes In Basis Points | BasisPoints 100 100
Sensitivity Analysis, Net Profit S/ 20,926 S/ 2,901
Sensitivity Analysis, Net Economic Value S/ 879,928 S/ 709,798
Soles at 150 basis points change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Changes In Basis Points | BasisPoints 150 150
Sensitivity Analysis, Net Profit S/ 31,389 S/ 4,352
Sensitivity Analysis, Net Economic Value S/ 1,319,893 S/ 1,064,696
US Dollar at 50 basis points change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Changes In Basis Points | BasisPoints 50 50
Sensitivity Analysis, Net Profit S/ 48,325 S/ 8,068
Sensitivity Analysis, Net Economic Value S/ 6,718 S/ 129,876
US Dollar at 75 basis points change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Changes In Basis Points | BasisPoints 75 75
Sensitivity Analysis, Net Profit S/ 72,487 S/ 12,103
Sensitivity Analysis, Net Economic Value S/ 10,078 S/ 194,813
US Dollar at 100 basis points change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Changes In Basis Points | BasisPoints 100 100
Sensitivity Analysis, Net Profit S/ 96,650 S/ 16,137
Sensitivity Analysis, Net Economic Value S/ 13,437 S/ 259,751
US Dollar at 150 basis points change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Changes In Basis Points | BasisPoints 150 150
Sensitivity Analysis, Net Profit S/ 144,975 S/ 24,205
Sensitivity Analysis, Net Economic Value S/ 20,155 S/ 389,627