TAX SITUATION - Deferred Income Tax (Details) - PEN (S/)
S/ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred asset    
Deferred asset S/ 520,953 S/ 463,717
Deferred liabilities    
Deferred liability (134,204) (108,603)
Buildings [member]    
Deferred liabilities    
Deferred liability (78) (3,076)
Buildings [member] | Other [Member]    
Deferred liabilities    
Deferred liability (66,818) (68,398)
Allowance for loan losses for loan portfolio [Member] | Other [Member]    
Deferred asset    
Deferred asset 699,970 674,689
Provision for profit sharing [Member]    
Deferred asset    
Deferred asset 57,351 8,852
Provision for sundry expenses and risks [Member]    
Deferred asset    
Deferred asset 5,313 3,761
Provision for sundry expenses and risks [Member] | Other [Member]    
Deferred asset    
Deferred asset 36,256 27,404
Provision for pending vacations [Member] | Other [Member]    
Deferred asset    
Deferred asset 24,378 16,817
Depreciation of improvements for leased premises [Member]    
Deferred asset    
Deferred asset 19,005 20,479
Carry forward tax losses [member]    
Deferred asset    
Deferred asset 14,309 20,369
Carry forward tax losses [member] | Other [Member]    
Deferred asset    
Deferred asset 4,773 6,790
Unrealized losses due to valuation of investments at fair value through other comprehensive income [Member]    
Deferred asset    
Deferred asset 6,229 11,893
Unrealized losses due to valuation of investments at fair value through other comprehensive income [Member] | Other [Member]    
Deferred asset    
Deferred asset 632 4,105
Others    
Deferred asset    
Deferred asset 27,913 5,126
Others | Other [Member]    
Deferred asset    
Deferred asset 51,541 35,122
Deferred liabilities    
Deferred liability (12,977) (12,694)
Intangibles net [Member]    
Deferred liabilities    
Deferred liability (50,048) (36,907)
Intangibles net [Member] | Other [Member]    
Deferred liabilities    
Deferred liability (223,101) (159,620)
Adjustment for difference in exchange of SUNAT and SBS [Member] | Other [Member]    
Deferred liabilities    
Deferred liability (30,846) (47,289)
Deferred acquisitions costs DAC [Member]    
Deferred liabilities    
Deferred liability (27,925) (28,581)
Deferred acquisitions costs DAC [Member] | Other [Member]    
Deferred liabilities    
Deferred liability (17,578) (14,913)
Unrealized gain due to valuation of investments at fair value through other comprehensive income [Member]    
Deferred liabilities    
Deferred liability (34,054) (20,790)
Unrealized gain due to valuation of investments at fair value through other comprehensive income [Member] | Other [Member]    
Deferred liabilities    
Deferred liability (12,387) (3,190)
Unrealized gain in valuation on fair value hedge derivatives [Member] | Other [Member]    
Deferred liabilities    
Deferred liability (9,451) (5,201)
Fluctuation of the fair value of the covered bonds [Member] | Other [Member]    
Deferred liabilities    
Deferred liability (7,971) (16,558)
Unrealized gain in valuation on cash flow hedge derivatives [Member] | Other [Member]    
Deferred liabilities    
Deferred liability (2,021) (6,608)
Unrealized losses due to valuation of investments available for sale [Member]    
Deferred asset    
Deferred asset 14,992 9,286
Technical reserves for premiums [Member]    
Deferred liabilities    
Deferred liability (23,180) (12,084)
Buildings revaluation [Member]    
Deferred liabilities    
Deferred liability (3,463) (1,694)
Buildings revaluation [Member] | Other [Member]    
Deferred liabilities    
Deferred liability (4,795) (5,356)
Deferred income due to commission [Member]    
Deferred asset    
Deferred asset 8,138 7,503
Allowance for loan losses for insurance [Member]    
Deferred asset    
Deferred asset 6,945 8,298
Gain generated in the reorganization of Pacfico EPS [Member]    
Deferred liabilities    
Deferred liability (39,515) (39,515)
Catastrophic insurance reserve [Member]    
Deferred liabilities    
Deferred liability (9,776) (9,950)
Leasing operations related to loans [Member]    
Deferred liabilities    
Deferred liability (3,810) (4,788)
Fluctuation due to valuation of investments at fair value through profit or loss investments [Member]    
Deferred liabilities    
Deferred liability 0 (3,061)
Fluctuation due to valuation of investments at fair value through profit or loss investments [Member] | Other [Member]    
Deferred liabilities    
Deferred liability S/ (11,202) S/ (5,107)