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CASH AND DUE FROM BANKS - The composition of the funds (Details) - PEN (S/)
S/ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Legal cash requirements    
Deposits with Central Reserve Bank of Peru S/ 13,727,222 S/ 11,769,043
Cash in vaults of Bank 4,132,347 5,591,168
Total legal cash requirements 17,859,569 17,360,211
Additional funds    
Overnight deposits with Central Reserve Bank of Peru (ii) 4,640,429 1,437,842
Cash in vaults of Bank and others 785,327 578,627
Total additional funds 5,425,756 2,016,469
Total S/ 23,285,325 S/ 19,376,680