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EQUITY - Reserves within equity (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of equity [Line Items]      
Begining Balances S/ 708,453    
Increase (Decrease) in net unrealized gains on investments 0 S/ 0 S/ 873,868
Transfer of net realized gains on investments to profit or loss 0 0 (517,006)
Change in net unrealized gains on cash flow hedges (62,002) 73,263 (59,709)
Transfer of net realized losses on cash flow hedges to profit or loss 35,059 (43,643) 2,278
Foreign exchange translation (58,862) 45,634 (54,334)
Ending Balances 1,088,189 708,453  
Other reserves [Member]      
Disclosure of equity [Line Items]      
Begining Balances 708,453 1,455,594 1,209,731
Increase (Decrease) in net unrealized gains on investments 703,790 (562,545) 873,868
Transfer of net realized gains on investments to profit or loss 420,987 (38,983) (517,006)
Transfer of the recovery of the impairment loss on investments to profit or loss, Note 24 (745) (1,909) (766)
Change in net unrealized gains on cash flow hedges (62,002) 73,263 (59,709)
Transfer of net realized losses on cash flow hedges to profit or loss 35,059 (43,643) 2,278
Foreign exchange translation (58,862) 45,634 (54,334)
Balance at December 31, 2017 - Restated     1,236,636
Change in accounting policy, Note 3(a)(vii)     (218,958)
Other reserves (658,491)    
Ending Balances 1,088,189 708,453 1,455,594
Investments in equity instruments      
Disclosure of equity [Line Items]      
Begining Balances 452,551    
Increase (Decrease) in net unrealized gains on investments 97,514 20,840  
Balance at December 31, 2017 - Restated     431,711
Change in accounting policy, Note 3(a)(vii)     431,711
Other reserves 0    
Ending Balances 550,065 452,551  
Investments in debt instruments      
Disclosure of equity [Line Items]      
Begining Balances 229,470    
Increase (Decrease) in net unrealized gains on investments 606,276 (583,385)  
Transfer of net realized gains on investments to profit or loss 420,987 (38,983)  
Transfer of the recovery of the impairment loss on investments to profit or loss, Note 24 (745) (1,909)  
Balance at December 31, 2017 - Restated     853,747
Change in accounting policy, Note 3(a)(vii)     853,747
Other reserves 0    
Ending Balances 1,255,988 229,470  
Insurance reserves      
Disclosure of equity [Line Items]      
Other reserves (658,491)    
Ending Balances (658,491)    
Available-for-sale investments      
Disclosure of equity [Line Items]      
Begining Balances 0 1,504,416 1,146,788
Increase (Decrease) in net unrealized gains on investments 0 0 873,868
Transfer of net realized gains on investments to profit or loss 0 0 (517,006)
Transfer of the recovery of the impairment loss on investments to profit or loss, Note 24 0 0 (766)
Change in net unrealized gains on cash flow hedges 0 0 0
Transfer of net realized losses on cash flow hedges to profit or loss 0 0 0
Foreign exchange translation 0 0 0
Balance at December 31, 2017 - Restated     0
Change in accounting policy, Note 3(a)(vii)     (1,504,416)
Other reserves 0    
Ending Balances 0 0 1,504,416
Cash flow hedge reserve      
Disclosure of equity [Line Items]      
Begining Balances (3,161) (32,781) 24,650
Increase (Decrease) in net unrealized gains on investments 0 0 0
Transfer of net realized gains on investments to profit or loss 0 0 0
Transfer of the recovery of the impairment loss on investments to profit or loss, Note 24 0 0 0
Change in net unrealized gains on cash flow hedges (62,002) 73,263 (59,709)
Transfer of net realized losses on cash flow hedges to profit or loss 35,059 (43,643) 2,278
Foreign exchange translation 0 0 0
Balance at December 31, 2017 - Restated     (32,781)
Change in accounting policy, Note 3(a)(vii)     0
Other reserves 0    
Ending Balances (30,104) (3,161) (32,781)
Foreign currency translation reserve      
Disclosure of equity [Line Items]      
Begining Balances 29,593 (16,041) 38,293
Increase (Decrease) in net unrealized gains on investments 0 0 0
Transfer of net realized gains on investments to profit or loss 0 0 0
Transfer of the recovery of the impairment loss on investments to profit or loss, Note 24 0 0 0
Change in net unrealized gains on cash flow hedges 0 0 0
Transfer of net realized losses on cash flow hedges to profit or loss 0 0 0
Foreign exchange translation (58,862) 45,634 (54,334)
Balance at December 31, 2017 - Restated     (16,041)
Change in accounting policy, Note 3(a)(vii)     0
Other reserves 0    
Ending Balances S/ (29,269) S/ 29,593 S/ (16,041)