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Related parties - Significant loan transactions with related parties (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning |  | ₩ 1,162,398 |  | ₩ 70,634 |
Collection |  | (1,746,803) |  | (370,536) |
Other |  | (33,330) | [1] | (32,229) | [2]
Ending |  | 738,657 |  | 1,162,398 |
Loan |  | 1,356,392 |  | 1,494,529 |
Nomura Rifa Private Real Estate Investment Trust No.19 |  |  |  |  |
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning |  | 11,700 |  | 11,529 |
Collection |  | (300) |  | (300) |
Other |  | 0 | [1] | 471 | [2]
Ending |  | 11,400 |  | 11,700 |
Loan |  | 0 |  | 0 |
Shinhan Global Active REIT Co.Ltd. [Member] |  |  |  |  |
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning | [3] | 0 |  | 0 |
Collection | [3] |  |  | (125,700) |
Other | [2],[3] |  |  | (39,700) |
Ending | [3] |  |  | 0 |
Loan | [3] |  |  | 165,400 |
SBC PFV Co., Ltd [Member] |  |  |  |  |
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning |  | 984,600 |  | 0 |
Collection |  | (1,735,100) |  | (185,100) |
Other |  | 0 | [1] | 0 | [2]
Ending |  | 519,800 |  | 984,600 |
Loan |  | 1,270,300 |  | 1,169,700 |
Goduck Gangil10 PFV Co., Ltd |  |  |  |  |
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning |  | 0 |  | 1,100 |
Collection |  |  |  | (1,100) |
Other | [2] |  |  | 0 |
Ending |  |  |  | 0 |
Loan |  |  |  | 0 |
Logisvalley Shinhan REIT Co., Ltd. |  |  |  |  |
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning |  | 33,000 |  | 33,000 |
Collection |  | 0 |  | (34,175) |
Other |  | 0 | [1] | 0 | [2]
Ending |  | 33,000 |  | 33,000 |
Loan |  | 0 |  | 34,175 |
CASCADETECH INC [Member] |  |  |  |  |
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning |  | 0 |  | 0 |
Collection |  |  |  | (66) |
Other | [2] |  |  | 0 |
Ending |  |  |  | 0 |
Loan |  |  |  | 66 |
Nomura-Rifa Private Real Estate Investment Trust 31 |  |  |  |  |
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning |  | 14,000 |  | 0 |
Collection |  | (140) |  | (14,000) |
Other |  | 0 | [1] | 0 | [2]
Ending |  | 13,860 |  | 14,000 |
Loan |  | 0 |  | 28,000 |
Pacific Private Placement Real Estate Fund No.40 |  |  |  |  |
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning |  | 14,000 |  | 0 |
Collection |  | 0 |  | 0 |
Other |  | 0 | [1] | 0 | [2]
Ending |  | 14,000 |  | 14,000 |
Loan |  | 0 |  | 14,000 |
KR Seocho Co., Ltd [Member] |  |  |  |  |
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning |  | 11,871 |  | 0 |
Collection |  | 0 |  | (7,000) |
Other |  | 0 | [1] | 7,000 | [2]
Ending |  | 11,871 |  | 11,871 |
Loan |  | 0 |  | 11,871 |
Songpa Biz Cluster PFV Co Ltd [Member] |  |  |  |  |
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning |  | 22,424 |  | 0 |
Collection |  | 0 |  | 0 |
Other |  | 0 | [1] | 0 | [2]
Ending |  | 70,272 |  | 22,424 |
Loan |  | 47,848 |  | 22,424 |
KB Distribution Private Real Estate 3-1 [Member] |  |  |  |  |
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning |  | 2,000 |  | 0 |
Collection |  | (2,000) |  | 0 |
Other |  | 0 | [1] | 0 | [2]
Ending |  | 0 |  | 2,000 |
Loan |  | 0 |  | 2,000 |
Capstone REITs No.26 [Member] |  |  |  |  |
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning |  | 20,000 |  | 0 |
Collection |  | 0 |  | 0 |
Other |  | 0 | [1] | 0 | [2]
Ending |  | 20,000 |  | 20,000 |
Loan |  | 0 |  | 20,000 |
EDNCENTRAL Co.,Ltd. [Member] |  |  |  |  |
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning |  | 25,400 |  | 0 |
Collection |  | 0 |  | 0 |
Other |  | (33,330) | [1] | 0 | [2]
Ending |  | 0 |  | 25,400 |
Loan |  | 7,930 |  | 25,400 |
Key management personnel and their immediate relatives |  |  |  |  |
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning |  | 3,403 |  | 5,005 |
Collection |  | (2,591) |  | (3,095) |
Other |  | 0 | [1] | 0 | [2]
Ending |  | 4,559 |  | 3,403 |
Loan |  | 3,747 |  | 1,493 |
IGIS Yongsan Office General Private Real Estate Investment Trust 518 [Member] |  |  |  |  |
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning |  | 20,000 |  | 20,000 |
Collection |  | 0 |  | 0 |
Other |  | 0 | [1] | 0 | [2]
Ending |  | 20,000 |  | 20,000 |
Loan |  | 0 |  | 0 |
Credila Financial Services [Member] |  |  |  |  |
Related parties - Significant loan transactions with related parties [Line Items] |  |  |  |  |
Beginning |  | 0 |  |  |
Collection |  | (6,672) |  |  |
Other | [1] | 0 |  |  |
Ending |  | 19,895 |  | ₩ 0 |
Loan |  | ₩ 26,567 |  |  |
[1] | Excluded from associates due to the loss of significant influence during the year ended December 31, 2025, and the year-end balance has been reclassified under ‘Others’.
[2] | The effect on changes in allowance for credit loss is included.
[3] | Excluded from associates due to the loss of significant influence during the year ended December 31, 2024, and the year-end balance has been reclassified under ‘Others’.

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- Definition The cash inflow from repayment to the entity of loans and advances made to related parties. [Refer: Total for all related parties [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2025-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_16&doctype=Standard -URIDate 2025-03-27 + Details
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Namespace Prefix: |
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