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Related parties - Significant loan transactions with related parties (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
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’.