v3.26.1
Risk management - Market, structural and liquidity risk (Details)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
EUR (€)
remuneration_component
scenario
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Transactional deposits (in percentage) 75.00%    
Deposit insured with deposit guarantee systems, retail deposits (in percentage) 80.00%    
Loans and advances to customers € 1,867,515,000 € 1,837,081,000 € 1,797,062,000
Market risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Risk management, VaR calculation, time frame 2 years    
VaR € 18,700 18,700 13,500
Increase (decrease) compared to last year increase in fair value of financial liability € (30)    
VaR confidence level, percent 99.00%    
VaE confidence level, percent 99.00%    
Loans and advances to customers € 1,867,515,000    
Market risk | Weighted average      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
VaR € 17,600 17,100 11,700
Market risk | Minimum      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Risk management, VaR calculation, time frame 520 days    
Interest rate risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
VaR € 15,300 20,200 11,100
Interest rate risk | NII risk concentration | US      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Increase in profit due to reasonably possible increase in designated risk component 49,000    
Interest rate risk | NII risk concentration | Brazil      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Increase in profit due to reasonably possible increase in designated risk component 57,000    
Interest rate risk | NII risk concentration | Euro | Total Europe      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Increase in profit due to reasonably possible increase in designated risk component 561,000    
Interest rate risk | NII risk concentration | Pound sterling | Total Europe      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Increase in profit due to reasonably possible increase in designated risk component 169,000    
Interest rate risk | NII risk concentration | US dollar | Total Europe      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Increase in profit due to reasonably possible increase in designated risk component 50,000    
Interest rate risk | EVE risk concentration | US      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Increase in profit due to reasonably possible increase in designated risk component 570,000    
Interest rate risk | EVE risk concentration | Brazil      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Increase in profit due to reasonably possible increase in designated risk component 257,000    
Interest rate risk | EVE risk concentration | Chile      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Increase in profit due to reasonably possible increase in designated risk component 225,000    
Interest rate risk | EVE risk concentration | Pound sterling | Total Europe      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Increase in profit due to reasonably possible increase in designated risk component 1,087,000    
Interest rate risk | EVE risk concentration | US dollar | Total Europe      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Increase in profit due to reasonably possible increase in designated risk component 104,000    
Interest rate risk | EVE risk concentration | Polish zloty | Total Europe      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Increase in profit due to reasonably possible increase in designated risk component 614,000    
Interest rate risk | Weighted average      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
VaR 16,500 17,000 12,200
Currency risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
VaR € 6,300 5,900 4,800
Core capital ratio for foreign exchange rate risk 100.00%    
Currency risk | Weighted average      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
VaR € 7,400 5,800 5,300
Equities      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
VaR 8,100 9,500 6,000
Equities | Equity instruments      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
VaR € 147,000 127,000 171,000
VaR confidence level, percent 99.00%    
Time frame, historical simulation 1 day    
Equities | Weighted average      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
VaR € 6,500 € 6,000 € 3,200
Liquidity risk      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Number of standard scenarios defined | scenario 5    
Percent of total assets encumbered 23.10%    
Total assets encumbered € 2,122,932,000    
Liquidity risk | Of which property collateral      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Number of categories of encumbered assets | remuneration_component 2    
Assets, collateral received and own debt securities issued other than covered bonds and ABSs encumbered € 491,519,000    
Matching liabilities, contingent liabilities or securities lent 472,045,000    
Liquidity risk | Of which property collateral | On-balance-sheet assets      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Loans and advances to customers € 304,923,000    
Percent of total assets encumbered 50.00%    
Liquidity risk | Of which property collateral | Off-balance-sheet assets      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Guarantees received committed € 185,160,000