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Derivatives - Summary of Derivative Currency Swap Forward Contract List (Details) - 12 months ended Dec. 31, 2022 - Currency forward contracts
$ in Thousands, ₩ in Millions
KRW (₩)
USD ($)
Disclosure of Derivative Currency forward contract detail list [Line Items]    
Derivative Counterparty Busan Bank Busan Bank
Contract date Dec. 08, 2022 Dec. 08, 2022
Maturity date Jan. 09, 2023 Jan. 09, 2023
Contract Amount Pay | ₩ ₩ 9,237  
Contract Amount Receive | $   $ 7,000
Contract exchange rate 1,319.5 1,319.5
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 09, 2022 Dec. 09, 2022
Maturity date Jan. 06, 2023 Jan. 06, 2023
Contract Amount Pay | ₩ ₩ 13,165  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,316.45 1,316.45
Derivative Counterparty Nonghyup Bank Nonghyup Bank
Contract date Dec. 13, 2022 Dec. 13, 2022
Maturity date Jan. 10, 2023 Jan. 10, 2023
Contract Amount Pay | ₩ ₩ 10,430  
Contract Amount Receive | $   $ 8,000
Contract exchange rate 1,303.8 1,303.8
Derivative Counterparty Kookmin Bank Kookmin Bank
Contract date Dec. 15, 2022 Dec. 15, 2022
Maturity date Jan. 16, 2023 Jan. 16, 2023
Contract Amount Pay | ₩ ₩ 12,988  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,298.84 1,298.84
Derivative Counterparty Hana Bank Hana Bank
Contract date Dec. 15, 2022 Dec. 15, 2022
Maturity date Jan. 17, 2023 Jan. 17, 2023
Contract Amount Pay | ₩ ₩ 28,632  
Contract Amount Receive | $   $ 22,000
Contract exchange rate 1,301.45 1,301.45
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Dec. 16, 2022 Dec. 16, 2022
Maturity date Jan. 18, 2023 Jan. 18, 2023
Contract Amount Pay | ₩ ₩ 26,141  
Contract Amount Receive | $   $ 20,000
Contract exchange rate 1,307.05 1,307.05
Derivative Counterparty Mizuho Bank Mizuho Bank
Contract date Dec. 16, 2022 Dec. 16, 2022
Maturity date Jan. 19, 2023 Jan. 19, 2023
Contract Amount Pay | ₩ ₩ 26,096  
Contract Amount Receive | $   $ 20,000
Contract exchange rate 1,304.8 1,304.8
Derivative Counterparty JP Morgan JP Morgan
Contract date Dec. 19, 2022 Dec. 19, 2022
Maturity date Jan. 20, 2023 Jan. 20, 2023
Contract Amount Pay | ₩ ₩ 26,080  
Contract Amount Receive | $   $ 20,000
Contract exchange rate 1,304 1,304
Derivative Counterparty Korea Development Bank Korea Development Bank
Contract date Dec. 19, 2022 Dec. 19, 2022
Maturity date Jan. 26, 2023 Jan. 26, 2023
Contract Amount Pay | ₩ ₩ 26,010  
Contract Amount Receive | $   $ 20,000
Contract exchange rate 1,300.5 1,300.5
Derivative Counterparty Kookmin Bank Kookmin Bank
Contract date Dec. 19, 2022 Dec. 19, 2022
Maturity date Jan. 27, 2023 Jan. 27, 2023
Contract Amount Pay | ₩ ₩ 25,959  
Contract Amount Receive | $   $ 20,000
Contract exchange rate 1,297.93 1,297.93
Derivative Counterparty Busan Bank Busan Bank
Contract date Dec. 21, 2022 Dec. 21, 2022
Maturity date Jan. 25, 2023 Jan. 25, 2023
Contract Amount Pay | ₩ ₩ 12,853  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,285.25 1,285.25
Derivative Counterparty Nonghyup Bank Nonghyup Bank
Contract date Dec. 21, 2022 Dec. 21, 2022
Maturity date Jan. 26, 2023 Jan. 26, 2023
Contract Amount Pay | ₩ ₩ 14,134  
Contract Amount Receive | $   $ 11,000
Contract exchange rate 1,284.9 1,284.9
Derivative Counterparty Hana Bank Hana Bank
Contract date Dec. 27, 2022 Dec. 27, 2022
Maturity date Jan. 30, 2023 Jan. 30, 2023
Contract Amount Pay | ₩ ₩ 18,992  
Contract Amount Receive | $   $ 15,000
Contract exchange rate 1,266.15 1,266.15
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Dec. 28, 2022 Dec. 28, 2022
Maturity date Jan. 31, 2023 Jan. 31, 2023
Contract Amount Pay | ₩ ₩ 15,216  
Contract Amount Receive | $   $ 12,000
Contract exchange rate 1,268 1,268
Derivative Counterparty Morgan Stanley Morgan Stanley
Contract date Dec. 28, 2022 Dec. 28, 2022
Maturity date Feb. 01, 2023 Feb. 01, 2023
Contract Amount Pay | ₩ ₩ 15,205  
Contract Amount Receive | $   $ 12,000
Contract exchange rate 1,267.1 1,267.1
Derivative Counterparty Kookmin Bank Kookmin Bank
Contract date Dec. 29, 2022 Dec. 29, 2022
Maturity date Feb. 02, 2023 Feb. 02, 2023
Contract Amount Pay | ₩ ₩ 20,247  
Contract Amount Receive | $   $ 16,000
Contract exchange rate 1,265.44 1,265.44
Derivative Counterparty Mizuho Bank Mizuho Bank
Contract date Dec. 29, 2022 Dec. 29, 2022
Maturity date Feb. 03, 2023 Feb. 03, 2023
Contract Amount Pay | ₩ ₩ 20,255  
Contract Amount Receive | $   $ 16,000
Contract exchange rate 1,265.95 1,265.95
Derivative Counterparty Kookmin Bank Kookmin Bank
Contract date Dec. 30, 2022 Dec. 30, 2022
Maturity date Feb. 28, 2023 Feb. 28, 2023
Contract Amount Pay | ₩ ₩ 15,128  
Contract Amount Receive | $   $ 12,000
Contract exchange rate 1,260.7 1,260.7
Derivative Counterparty Hana Bank Hana Bank
Contract date Dec. 06, 2022 Dec. 06, 2022
Maturity date Jan. 06, 2023 Jan. 06, 2023
Contract Amount Pay | ₩ ₩ 13,091  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,309.05 1,309.05
Derivative Counterparty Mizuho Bank Mizuho Bank
Contract date Dec. 15, 2022 Dec. 15, 2022
Maturity date Jan. 13, 2023 Jan. 13, 2023
Contract Amount Pay | ₩ ₩ 26,001  
Contract Amount Receive | $   $ 20,000
Contract exchange rate 1,300.07 1,300.07
Derivative Counterparty MUFG MUFG
Contract date Dec. 19, 2022 Dec. 19, 2022
Maturity date Jan. 20, 2023 Jan. 20, 2023
Contract Amount Pay | ₩ ₩ 52,054  
Contract Amount Receive | $   $ 40,000
Contract exchange rate 1,301.35 1,301.35
Derivative Counterparty MUFG MUFG
Contract date Dec. 20, 2022 Dec. 20, 2022
Maturity date Jan. 13, 2023 Jan. 13, 2023
Contract Amount Pay | ₩ ₩ 25,952  
Contract Amount Receive | $   $ 20,000
Contract exchange rate 1,297.6 1,297.6
Derivative Counterparty MUFG MUFG
Contract date Dec. 29, 2022 Dec. 29, 2022
Maturity date Jan. 27, 2023 Jan. 27, 2023
Contract Amount Pay | ₩ ₩ 45,605  
Contract Amount Receive | $   $ 36,000
Contract exchange rate 1,266.8 1,266.8
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Nov. 03, 2022 Nov. 03, 2022
Maturity date Jan. 09, 2023 Jan. 09, 2023
Contract Amount Pay | ₩ ₩ 7,085  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,417 1,417
Derivative Counterparty JP Morgan JP Morgan
Contract date Nov. 07, 2022 Nov. 07, 2022
Maturity date Jan. 13, 2023 Jan. 13, 2023
Contract Amount Pay | ₩ ₩ 14,012  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,401.2 1,401.2
Derivative Counterparty JP Morgan JP Morgan
Contract date Nov. 25, 2022 Nov. 25, 2022
Maturity date Jan. 20, 2023 Jan. 20, 2023
Contract Amount Pay | ₩ ₩ 6,611  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,322.1 1,322.1
Derivative Counterparty JP Morgan JP Morgan
Contract date Dec. 29, 2022 Dec. 29, 2022
Maturity date Jan. 05, 2023 Jan. 05, 2023
Contract Amount Pay | ₩ ₩ 38,040  
Contract Amount Receive | $   $ 30,000
Contract exchange rate 1,268 1,268
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Dec. 29, 2022 Dec. 29, 2022
Maturity date Jan. 05, 2023 Jan. 05, 2023
Contract Amount Pay | ₩ ₩ 25,358  
Contract Amount Receive | $   $ 20,000
Contract exchange rate 1,267.9 1,267.9
Derivative Counterparty Mizuho Bank Mizuho Bank
Contract date Nov. 09, 2022 Nov. 09, 2022
Maturity date Jan. 06, 2023 Jan. 06, 2023
Contract Amount Pay | ₩ ₩ 13,681  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,368.1 1,368.1
Derivative Counterparty Nonghyup Bank Nonghyup Bank
Contract date Dec. 27, 2022 Dec. 27, 2022
Maturity date Jan. 16, 2023 Jan. 16, 2023
Contract Amount Pay | ₩ ₩ 6,334  
Contract Amount Receive | $   $ 5,000
Contract exchange rate 1,266.7 1,266.7
Derivative Counterparty Mizuho Bank Mizuho Bank
Contract date Nov. 11, 2022 Nov. 11, 2022
Maturity date Jan. 30, 2023 Jan. 30, 2023
Contract Amount Pay | ₩ ₩ 5,207  
Contract Amount Receive | $   $ 3,842
Contract exchange rate 1,355.05 1,355.05
Derivative Counterparty Mizuho Bank Mizuho Bank
Contract date Nov. 11, 2022 Nov. 11, 2022
Maturity date Jan. 30, 2023 Jan. 30, 2023
Contract Amount Pay | ₩ ₩ 34,001  
Contract Amount Receive | $   $ 25,000
Contract exchange rate 1,360.05 1,360.05
Derivative Counterparty Nonghyup Bank Nonghyup Bank
Contract date Dec. 21, 2022 Dec. 21, 2022
Maturity date Feb. 23, 2023 Feb. 23, 2023
Contract Amount Pay | ₩ ₩ 3,603  
Contract Amount Receive | $   $ 2,806
Contract exchange rate 1,283.7 1,283.7
Derivative Counterparty SMBC SMBC
Contract date Nov. 30, 2022 Nov. 30, 2022
Maturity date Jan. 20, 2023 Jan. 20, 2023
Contract Amount Pay | $   $ 10,000
Contract Amount Receive | ₩ ₩ 13,153  
Contract exchange rate 1,315.3 1,315.3
Derivative Counterparty SMBC SMBC
Contract date Nov. 30, 2022 Nov. 30, 2022
Maturity date Feb. 16, 2023 Feb. 16, 2023
Contract Amount Pay | $   $ 15,000
Contract Amount Receive | ₩ ₩ 19,783  
Contract exchange rate 1,318.85 1,318.85
Derivative Counterparty SMBC SMBC
Contract date Dec. 26, 2022 Dec. 26, 2022
Maturity date Mar. 23, 2023 Mar. 23, 2023
Contract Amount Pay | $   $ 8,000
Contract Amount Receive | ₩ ₩ 10,173  
Contract exchange rate 1,271.6 1,271.6
Derivative Counterparty SMBC SMBC
Contract date Dec. 29, 2022 Dec. 29, 2022
Maturity date Mar. 28, 2023 Mar. 28, 2023
Contract Amount Pay | $   $ 15,000
Contract Amount Receive | ₩ ₩ 18,933  
Contract exchange rate 1,262.2 1,262.2
Derivative Counterparty SMBC SMBC
Contract date Dec. 29, 2022 Dec. 29, 2022
Maturity date Jun. 13, 2023 Jun. 13, 2023
Contract Amount Pay | $   $ 15,000
Contract Amount Receive | ₩ ₩ 18,872  
Contract exchange rate 1,258.1 1,258.1
Derivative Counterparty MUFG MUFG
Contract date Nov. 25, 2022 Nov. 25, 2022
Maturity date Feb. 08, 2023 Feb. 08, 2023
Contract Amount Pay | ₩ ₩ 13,175  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,317.5 1,317.5
Derivative Counterparty MUFG MUFG
Contract date Dec. 12, 2022 Dec. 12, 2022
Maturity date Feb. 27, 2023 Feb. 27, 2023
Contract Amount Pay | ₩ ₩ 33,947  
Contract Amount Receive | $   $ 26,000
Contract exchange rate 1,305.64 1,305.64
Derivative Counterparty MUFG MUFG
Contract date Nov. 24, 2022 Nov. 24, 2022
Maturity date Jan. 30, 2023 Jan. 30, 2023
Contract Amount Pay | ₩ ₩ 13,234  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,323.4 1,323.4
Derivative Counterparty JP Morgan JP Morgan
Contract date Nov. 24, 2022 Nov. 24, 2022
Maturity date Jan. 30, 2023 Jan. 30, 2023
Contract Amount Pay | ₩ ₩ 13,830  
Contract Amount Receive | $   $ 10,406
Contract exchange rate 1,329.05 1,329.05
Derivative Counterparty JP Morgan JP Morgan
Contract date Nov. 30, 2022 Nov. 30, 2022
Maturity date Jan. 17, 2023 Jan. 17, 2023
Contract Amount Pay | ₩ ₩ 13,163  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,316.3 1,316.3
Derivative Counterparty HSBC HSBC
Contract date Nov. 09, 2022 Nov. 09, 2022
Maturity date Jan. 30, 2023 Jan. 30, 2023
Contract Amount Pay | ₩ ₩ 42,627  
Contract Amount Receive | $   $ 31,000
Contract exchange rate 1,375.05 1,375.05
Derivative Counterparty HSBC HSBC
Contract date Oct. 19, 2020 Oct. 19, 2020
Maturity date Oct. 29, 2024 Oct. 29, 2024
Contract Amount Pay | ₩ ₩ 140,913  
Contract Amount Receive | $   $ 125,000
Contract exchange rate 1,127.3 1,127.3
Derivative Counterparty Busan Bank Busan Bank
Contract date Oct. 25, 2022 Oct. 25, 2022
Maturity date Jan. 13, 2023 Jan. 13, 2023
Contract Amount Pay | ₩ ₩ 13,039  
Contract Amount Receive | $   $ 9,090
Contract exchange rate 1,434.5 1,434.5
Derivative Counterparty MUFG MUFG
Contract date Oct. 25, 2022 Oct. 25, 2022
Maturity date Jan. 13, 2023 Jan. 13, 2023
Contract Amount Pay | ₩ ₩ 1,433  
Contract Amount Receive | $   $ 1,000
Contract exchange rate 1,433.18 1,433.18
Derivative Counterparty Woori Bank Woori Bank
Contract date Nov. 08, 2022 Nov. 08, 2022
Maturity date Feb. 03, 2023 Feb. 03, 2023
Contract Amount Pay | ₩ ₩ 12,332  
Contract Amount Receive | $   $ 8,918
Contract exchange rate 1,382.8 1,382.8
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Nov. 09, 2022 Nov. 09, 2022
Maturity date Mar. 03, 2023 Mar. 03, 2023
Contract Amount Pay | ₩ ₩ 13,605  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,360.5 1,360.5
Derivative Counterparty MUFG MUFG
Contract date Nov. 10, 2022 Nov. 10, 2022
Maturity date Mar. 03, 2023 Mar. 03, 2023
Contract Amount Pay | ₩ ₩ 20,464  
Contract Amount Receive | $   $ 15,000
Contract exchange rate 1,364.27 1,364.27
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Nov. 24, 2022 Nov. 24, 2022
Maturity date Apr. 07, 2023 Apr. 07, 2023
Contract Amount Pay | ₩ ₩ 17,612  
Contract Amount Receive | $   $ 13,214
Contract exchange rate 1,332.8 1,332.8
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Dec. 01, 2022 Dec. 01, 2022
Maturity date May 12, 2023 May 12, 2023
Contract Amount Pay | ₩ ₩ 12,932  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,293.2 1,293.2
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Dec. 05, 2022 Dec. 05, 2022
Maturity date May 12, 2023 May 12, 2023
Contract Amount Pay | ₩ ₩ 3,121  
Contract Amount Receive | $   $ 2,425
Contract exchange rate 1,286.9 1,286.9
Derivative Counterparty Woori Bank Woori Bank
Contract date Dec. 08, 2022 Dec. 08, 2022
Maturity date May 12, 2023 May 12, 2023
Contract Amount Pay | ₩ ₩ 13,145  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,314.5 1,314.5
Derivative Counterparty HSBC HSBC
Contract date Dec. 12, 2022 Dec. 12, 2022
Maturity date Jun. 09, 2023 Jun. 09, 2023
Contract Amount Pay | ₩ ₩ 19,482  
Contract Amount Receive | $   $ 15,000
Contract exchange rate 1,298.8 1,298.8
Derivative Counterparty Busan Bank Busan Bank
Contract date Dec. 12, 2022 Dec. 12, 2022
Maturity date Jun. 09, 2023 Jun. 09, 2023
Contract Amount Pay | ₩ ₩ 19,479  
Contract Amount Receive | $   $ 15,000
Contract exchange rate 1,298.6 1,298.6
Derivative Counterparty MUFG MUFG
Contract date Dec. 15, 2022 Dec. 15, 2022
Maturity date Jun. 09, 2023 Jun. 09, 2023
Contract Amount Pay | ₩ ₩ 19,386  
Contract Amount Receive | $   $ 15,000
Contract exchange rate 1,292.41 1,292.41
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Dec. 15, 2022 Dec. 15, 2022
Maturity date Jun. 09, 2023 Jun. 09, 2023
Contract Amount Pay | ₩ ₩ 19,397  
Contract Amount Receive | $   $ 15,000
Contract exchange rate 1,293.1 1,293.1
Derivative Counterparty Standard Chartered Standard Chartered
Contract date Dec. 15, 2022 Dec. 15, 2022
Maturity date Jun. 09, 2023 Jun. 09, 2023
Contract Amount Pay | ₩ ₩ 19,397  
Contract Amount Receive | $   $ 15,000
Contract exchange rate 1,293.1 1,293.1
Derivative Counterparty HSBC HSBC
Contract date Dec. 22, 2022 Dec. 22, 2022
Maturity date Jun. 09, 2023 Jun. 09, 2023
Contract Amount Pay | ₩ ₩ 12,695  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,269.45 1,269.45
Derivative Counterparty Shinhan Bank Shinhan Bank
Contract date Dec. 22, 2022 Dec. 22, 2022
Maturity date Jun. 09, 2023 Jun. 09, 2023
Contract Amount Pay | ₩ ₩ 12,671  
Contract Amount Receive | $   $ 10,000
Contract exchange rate 1,267.1 1,267.1