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INTEREST AND SIMILAR INCOME AND INTEREST AND SIMILAR EXPENSES (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest and similar income      
Interest on loans S/ 9,546,454 S/ 9,479,867 S/ 8,706,372
Interest on available-for-sale investments 951,981 828,004 716,786
Interest on held-to-maturity investments 234,380 190,466 136,579
Interest on trading securities 113,484 86,568 68,538
Interest on due from banks 88,359 48,626 32,818
Dividends received 52,906 51,831 55,594
Other interest and similar income 43,119 87,693 67,402
Total 11,030,683 10,773,055 9,784,089
Interest and similar expense      
Interest on deposits and obligations (1,132,041) (1,062,751) (859,797)
Interest on bonds and notes issued (835,255) (805,351) (753,174)
Interest on due to banks and correspondents (763,436) (822,514) (758,396)
Other interest and similar expense (228,464) (224,098) (155,766)
Total S/ (2,959,196) S/ (2,914,714) S/ (2,527,133)