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Financial assets - Nominal and fair value of financial assets (Details) ₺ in Thousands, € in Thousands, $ in Thousands | 12 Months Ended |
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Dec. 31, 2024 TRY (₺) | Dec. 31, 2023 TRY (₺) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 EUR (€)
Debt securities |  |  |  |
Financial assets |  |  |  |
Financial asset at fair value | ₺ 14,093,601 | ₺ 153,075 |  |
Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Financial asset at fair value | 3,573,688 | 12,806,149 |  |
15 May 2034 | USD | Debt securities |  |  |  |
Financial assets |  |  |  |
Notional amount | $ |  |  | $ 135,000 |
Financial asset at fair value | ₺ 4,712,855 |  |  |
Fair Value Maturity Date | 15 May 2034 |  |  |
16 October 2028 | USD | Debt securities |  |  |  |
Financial assets |  |  |  |
Notional amount | $ |  |  | 54,500 |
Financial asset at fair value | ₺ 2,109,168 |  |  |
Fair Value Maturity Date | 16 October 2028 |  |  |
12 August 2026 | TRY | Debt securities |  |  |  |
Financial assets |  |  |  |
Notional amount | ₺ 988,000 |  |  |
Financial asset at fair value | ₺ 1,108,232 |  |  |
Fair Value Maturity Date | 12 August 2026 |  |  |
12 September 2029 | TRY | Debt securities |  |  |  |
Financial assets |  |  |  |
Notional amount | ₺ 1,001,000 |  |  |
Financial asset at fair value | ₺ 1,066,790 |  |  |
Fair Value Maturity Date | 12 September 2029 |  |  |
21 May 2030 | EUR | Debt securities |  |  |  |
Financial assets |  |  |  |
Notional amount | € |  |  |  | € 24,500
Financial asset at fair value | ₺ 985,303 |  |  |
Fair Value Maturity Date | 21 May 2030 |  |  |
12 November 2026 | USD | Debt securities |  |  |  |
Financial assets |  |  |  |
Notional amount | $ |  |  | 22,500 |
Financial asset at fair value | ₺ 852,843 |  |  |
Fair Value Maturity Date | 12 November 2026 |  |  |
23 January 2025 | USD | Debt securities |  |  |  |
Financial assets |  |  |  |
Notional amount | $ |  |  | 20,000 |
Financial asset at fair value | ₺ 723,456 |  |  |
Fair Value Maturity Date | 23 January 2025 |  |  |
1 October 2025 | USD | Debt securities |  |  |  |
Financial assets |  |  |  |
Notional amount | $ |  |  | 15,000 |
Financial asset at fair value | ₺ 565,800 |  |  |
Fair Value Maturity Date | 1 October 2025 |  |  |
12 December 2025 | USD | Debt securities |  |  |  |
Financial assets |  |  |  |
Notional amount | $ |  |  | 13,000 |
Financial asset at fair value | ₺ 468,617 |  |  |
Fair Value Maturity Date | 12 December 2025 |  |  |
5 October 2034 | USD | Debt securities |  |  |  |
Financial assets |  |  |  |
Notional amount | $ |  |  | 11,500 |
Financial asset at fair value | ₺ 426,300 |  |  |
Fair Value Maturity Date | 5 October 2034 |  |  |
16 January 2029 | USD | Debt securities |  |  |  |
Financial assets |  |  |  |
Notional amount | $ |  |  | 11,000 |
Financial asset at fair value | ₺ 416,006 |  |  |
Fair Value Maturity Date | 16 January 2029 |  |  |
3 December 2025 | USD | Debt securities |  |  |  |
Financial assets |  |  |  |
Notional amount | $ |  |  | 10,000 |
Financial asset at fair value | ₺ 354,485 |  |  |
Fair Value Maturity Date | 3 December 2025 |  |  |
19 October 2028 | USD | Debt securities |  |  |  |
Financial assets |  |  |  |
Notional amount | $ |  |  | 4,500 |
Financial asset at fair value | ₺ 174,675 |  |  |
Fair Value Maturity Date | 19 October 2028 |  |  |
31 March 2025 | USD | Debt securities |  |  |  |
Financial assets |  |  |  |
Notional amount | $ |  |  | $ 3,620 |
Financial asset at fair value | ₺ 129,071 |  |  |
Fair Value Maturity Date | 31 March 2025 |  |  |
25 April 2025 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount | ₺ 1,644,192 |  |  |
Financial asset at fair value | ₺ 2,204,151 |  |  |
Fair Value Maturity Date | 25 April 2025 |  |  |
26 February 2025 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount | ₺ 505,259 |  |  |
Financial asset at fair value | ₺ 650,212 |  |  |
Fair Value Maturity Date | 26 February 2025 |  |  |
21 February 2025 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount | ₺ 246,418 |  |  |
Financial asset at fair value | ₺ 318,588 |  |  |
Fair Value Maturity Date | 21 February 2025 |  |  |
28 February 2025 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount | ₺ 155,895 |  |  |
Financial asset at fair value | ₺ 200,435 |  |  |
Fair Value Maturity Date | 28 February 2025 |  |  |
27 February 2025 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount | ₺ 155,646 |  |  |
Financial asset at fair value | ₺ 200,302 |  |  |
Fair Value Maturity Date | 27 February 2025 |  |  |
22 February 2024 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount |  | 1,191,635 |  |
Financial asset at fair value |  | ₺ 2,501,231 |  |
Fair Value Maturity Date |  | 22 February 2024 |  |
26 February 2024 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount |  | ₺ 1,071,635 |  |
Financial asset at fair value |  | ₺ 2,486,610 |  |
Fair Value Maturity Date |  | 26 February 2024 |  |
27 February 2024 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount |  | ₺ 955,742 |  |
Financial asset at fair value |  | ₺ 1,668,658 |  |
Fair Value Maturity Date |  | 27 February 2024 |  |
26 April 2024 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount |  | ₺ 599,368 |  |
Financial asset at fair value |  | ₺ 1,032,389 |  |
Fair Value Maturity Date |  | 26 April 2024 |  |
10 May 2024 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount |  | ₺ 972,020 |  |
Financial asset at fair value |  | ₺ 721,410 |  |
Fair Value Maturity Date |  | 10 May 2024 |  |
12 February 2024 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount |  | ₺ 207,853 |  |
Financial asset at fair value |  | ₺ 604,290 |  |
Fair Value Maturity Date |  | 12 February 2024 |  |
28 February 2024 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount |  | ₺ 700,000 |  |
Financial asset at fair value |  | ₺ 1,123,365 |  |
Fair Value Maturity Date |  | 28 February 2024 |  |
31 July 2024 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount |  | ₺ 428,045 |  |
Financial asset at fair value |  | ₺ 684,812 |  |
Fair Value Maturity Date |  | 31 July 2024 |  |
16 August 2024 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount |  | ₺ 269,857 |  |
Financial asset at fair value |  | ₺ 470,494 |  |
Fair Value Maturity Date |  | 16 August 2024 |  |
28 August 2024 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount |  | ₺ 274,462 |  |
Financial asset at fair value |  | ₺ 467,039 |  |
Fair Value Maturity Date |  | 28 August 2024 |  |
02 October 2024 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount |  | ₺ 229,780 |  |
Financial asset at fair value |  | ₺ 365,499 |  |
Fair Value Maturity Date |  | 2 October 2024 |  |
01 April 2024 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount |  | ₺ 140,639 |  |
Financial asset at fair value |  | ₺ 245,793 |  |
Fair Value Maturity Date |  | 1 April 2024 |  |
15 April 2024 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount |  | ₺ 94,501 |  |
Financial asset at fair value |  | ₺ 217,423 |  |
Fair Value Maturity Date |  | 15 April 2024 |  |
24 October 2024 | TRY | Currency protected time deposits |  |  |  |
Financial assets |  |  |  |
Notional amount |  | ₺ 94,501 |  |
Financial asset at fair value |  | ₺ 217,136 |  |
Fair Value Maturity Date |  | 24 October 2024 |  |
Indefinite | TRY | Debt securities |  |  |  |
Financial assets |  |  |  |
Notional amount |  | ₺ 73,426 |  |
Financial asset at fair value |  | ₺ 153,075 |  |
Fair Value Maturity Date |  | Indefinite |  |

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