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FINANCIAL RISK MANAGEMENT - Assets and Liabilities by Currencies (Details) - PEN (S/) S/ in Thousands | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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Disclosure of financial risks management [Line Items] |  |  |  |  |
Cash and due from banks | S/ 25,986,762 |  | S/ 22,168,516 |  |
Cash collateral, reverse repurchase agreements and securities borrowings | 4,288,524 |  | 4,082,942 | S/ 7,480,420 |
At fair value through profit or loss | 3,850,762 |  | 3,512,445 |  |
At fair value through other comprehensive income | 26,202,723 |  | 25,195,835 |  |
Available-for-sale | 25,370,413 |  | 24,331,543 |  |
Amortized cost | 1,907,738 |  | 1,292,203 |  |
Loans | 110,485,717 |  | 105,806,998 |  |
Financial assets designated at fair value through profit or loss | 620,544 |  | 521,186 |  |
Other assets | 2,792,968 |  | 3,072,777 |  |
Total monetary assets | 187,876,691 |  | 177,263,201 |  | S/ 170,472,000
Deposits and obligations | (112,005,385) |  | (104,551,310) |  |
Payables from repurchase agreements and security Lendings | (7,678,016) |  | (9,415,357) |  |
Due to bank and correspondents | (8,841,732) |  | (8,448,140) |  |
Lease liabilities | (847,504) | S/ (852,800) | 0 |  |
Financial liabilities at fair value through profit or loss | (493,700) |  | (362,310) |  |
Technical reserves for claims and insurance premiums | (9,950,233) |  | (8,452,671) |  |
Bonds and notes issued | (14,946,363) |  | (15,457,540) |  |
Other liabilities | (5,481,288) |  | (4,941,533) |  |
Total monetary liabilities | (161,130,381) |  | (152,997,125) |  | S/ (148,219,000)
Forwards position, net | 66,635 |  | (309) |  |
Currency swaps position, net | 0 |  | 0 |  |
Cross currency swaps position, net | (152,545) |  | 0 |  |
Options, net | 0 |  | 0 |  |
Net monetary position | 18,009,803 |  | 17,531,453 |  |
Monetary Assets [Member] |  |  |  |  |
Disclosure of financial risks management [Line Items] |  |  |  |  |
Cash and due from banks | 25,986,762 |  | 22,168,516 |  |
Cash collateral, reverse repurchase agreements and securities borrowings | 4,288,524 |  | 4,082,942 |  |
At fair value through profit or loss | 3,850,762 |  | 3,512,445 |  |
At fair value through other comprehensive income | 25,623,524 |  | 24,546,365 |  |
Amortized cost | 3,477,046 |  | 4,154,838 |  |
Loans | 110,485,717 |  | 105,806,998 |  |
Financial assets designated at fair value through profit or loss | 620,544 |  | 521,186 |  |
Other assets | 4,893,215 |  | 5,735,597 |  |
Total monetary assets | 179,226,094 |  | 170,528,887 |  |
Monetary Liabilities [Member] |  |  |  |  |
Disclosure of financial risks management [Line Items] |  |  |  |  |
Deposits and obligations | (112,005,385) |  | (104,551,310) |  |
Payables from repurchase agreements and security Lendings | (7,678,016) |  | (9,415,357) |  |
Due to bank and correspondents | (8,841,732) |  | (8,448,140) |  |
Financial liabilities at fair value through profit or loss | (493,700) |  | (362,310) |  |
Technical reserves for claims and insurance premiums | (9,950,233) |  | (8,452,671) |  |
Bonds and notes issued | (14,946,363) |  | (15,457,540) |  |
Other liabilities | (6,367,448) |  | (6,309,797) |  |
Total monetary liabilities | (161,130,381) |  | (152,997,125) |  |
Gains (losses) on net monetary position | 18,095,713 |  | 17,531,762 |  |
Lease liabilities [member] |  |  |  |  |
Disclosure of financial risks management [Line Items] |  |  |  |  |
Lease liabilities | (847,504) |  | 0 |  |
The Soles [Member] |  |  |  |  |
Disclosure of financial risks management [Line Items] |  |  |  |  |
Forwards position, net | 1,534,948 |  | 1,820,527 |  |
Currency swaps position, net | 281,672 |  | (199,746) |  |
Cross currency swaps position, net | (787,355) |  | (1,833,236) |  |
Options, net | 25,071 |  | (23,414) |  |
Net monetary position | 17,384,067 |  | 15,840,098 |  |
The Soles [Member] | Monetary Assets [Member] |  |  |  |  |
Disclosure of financial risks management [Line Items] |  |  |  |  |
Cash and due from banks | 3,960,190 |  | 3,582,390 |  |
Cash collateral, reverse repurchase agreements and securities borrowings | 150,009 |  | 6,654 |  |
At fair value through profit or loss | 800,370 |  | 541,649 |  |
At fair value through other comprehensive income | 18,221,102 |  | 16,757,917 |  |
Amortized cost | 3,355,579 |  | 3,239,330 |  |
Loans | 66,737,870 |  | 61,665,634 |  |
Financial assets designated at fair value through profit or loss | 44,223 |  | 44,109 |  |
Other assets | 2,072,867 |  | 2,561,684 |  |
Total monetary assets | 95,342,210 |  | 88,399,367 |  |
The Soles [Member] | Monetary Liabilities [Member] |  |  |  |  |
Disclosure of financial risks management [Line Items] |  |  |  |  |
Deposits and obligations | (56,769,748) |  | (51,559,266) |  |
Payables from repurchase agreements and security Lendings | (5,068,896) |  | (5,914,736) |  |
Due to bank and correspondents | (3,798,717) |  | (3,442,620) |  |
Financial liabilities at fair value through profit or loss | 0 |  | (35,220) |  |
Technical reserves for claims and insurance premiums | (5,642,772) |  | (4,318,973) |  |
Bonds and notes issued | (4,028,893) |  | (3,599,610) |  |
Other liabilities | (3,541,350) |  | (3,452,975) |  |
Total monetary liabilities | (79,012,479) |  | (72,323,400) |  |
Gains (losses) on net monetary position | 16,329,731 |  | 16,075,967 |  |
The Soles [Member] | Lease liabilities [member] |  |  |  |  |
Disclosure of financial risks management [Line Items] |  |  |  |  |
Lease liabilities | (162,103) |  | 0 |  |
US Dollars [Member] |  |  |  |  |
Disclosure of financial risks management [Line Items] |  |  |  |  |
Forwards position, net | (1,351,414) |  | (1,719,788) |  |
Currency swaps position, net | (281,672) |  | 199,512 |  |
Cross currency swaps position, net | 692,525 |  | 1,918,994 |  |
Options, net | (25,071) |  | 23,414 |  |
Net monetary position | 149,989 |  | 998,747 |  |
US Dollars [Member] | Monetary Assets [Member] |  |  |  |  |
Disclosure of financial risks management [Line Items] |  |  |  |  |
Cash and due from banks | 20,762,648 |  | 17,117,551 |  |
Cash collateral, reverse repurchase agreements and securities borrowings | 3,389,090 |  | 3,362,285 |  |
At fair value through profit or loss | 1,053,925 |  | 733,801 |  |
At fair value through other comprehensive income | 6,869,840 |  | 7,057,303 |  |
Amortized cost | 100,299 |  | 915,508 |  |
Loans | 35,598,141 |  | 37,032,752 |  |
Financial assets designated at fair value through profit or loss | 576,321 |  | 477,077 |  |
Other assets | 2,142,237 |  | 2,765,000 |  |
Total monetary assets | 70,492,501 |  | 69,461,277 |  |
US Dollars [Member] | Monetary Liabilities [Member] |  |  |  |  |
Disclosure of financial risks management [Line Items] |  |  |  |  |
Deposits and obligations | (46,319,179) |  | (44,122,875) |  |
Payables from repurchase agreements and security Lendings | (734,441) |  | (1,860,424) |  |
Due to bank and correspondents | (4,709,610) |  | (4,751,314) |  |
Financial liabilities at fair value through profit or loss | (94,475) |  | (58,031) |  |
Technical reserves for claims and insurance premiums | (4,301,468) |  | (4,131,263) |  |
Bonds and notes issued | (10,660,989) |  | (11,752,328) |  |
Other liabilities | (1,951,682) |  | (2,208,427) |  |
Total monetary liabilities | (69,376,880) |  | (68,884,662) |  |
Gains (losses) on net monetary position | 1,115,621 |  | 576,615 |  |
US Dollars [Member] | Lease liabilities [member] |  |  |  |  |
Disclosure of financial risks management [Line Items] |  |  |  |  |
Lease liabilities | (605,036) |  | 0 |  |
Other Currency [Member] |  |  |  |  |
Disclosure of financial risks management [Line Items] |  |  |  |  |
Forwards position, net | (116,899) |  | (101,048) |  |
Currency swaps position, net | 0 |  | 234 |  |
Cross currency swaps position, net | (57,715) |  | (85,758) |  |
Options, net | 0 |  | 0 |  |
Net monetary position | 475,747 |  | 692,608 |  |
Other Currency [Member] | Monetary Assets [Member] |  |  |  |  |
Disclosure of financial risks management [Line Items] |  |  |  |  |
Cash and due from banks | 1,263,924 |  | 1,468,575 |  |
Cash collateral, reverse repurchase agreements and securities borrowings | 749,425 |  | 714,003 |  |
At fair value through profit or loss | 1,996,467 |  | 2,236,995 |  |
At fair value through other comprehensive income | 532,582 |  | 731,145 |  |
Amortized cost | 21,168 |  | 0 |  |
Loans | 8,149,706 |  | 7,108,612 |  |
Financial assets designated at fair value through profit or loss | 0 |  | 0 |  |
Other assets | 678,111 |  | 408,913 |  |
Total monetary assets | 13,391,383 |  | 12,668,243 |  |
Other Currency [Member] | Monetary Liabilities [Member] |  |  |  |  |
Disclosure of financial risks management [Line Items] |  |  |  |  |
Deposits and obligations | (8,916,458) |  | (8,869,169) |  |
Payables from repurchase agreements and security Lendings | (1,874,679) |  | (1,640,197) |  |
Due to bank and correspondents | (333,405) |  | (254,206) |  |
Financial liabilities at fair value through profit or loss | (399,225) |  | (269,059) |  |
Technical reserves for claims and insurance premiums | (5,993) |  | (2,435) |  |
Bonds and notes issued | (256,481) |  | (105,602) |  |
Other liabilities | (874,416) |  | (648,395) |  |
Total monetary liabilities | (12,741,022) |  | (11,789,063) |  |
Gains (losses) on net monetary position | 650,361 |  | 879,180 |  |
Other Currency [Member] | Lease liabilities [member] |  |  |  |  |
Disclosure of financial risks management [Line Items] |  |  |  |  |
Lease liabilities | S/ (80,365) |  | S/ 0 |  |

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