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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Recurring      
Assets      
Trading Securities Debt $ 27,303   $ 31,568
Recurring | CMO      
Assets      
Trading Securities Debt 90   98
Recurring | Other      
Assets      
Trading Securities Debt 166   167
Recurring | Level 3      
Assets      
Trading Securities Debt 250   284
Recurring | Level 3 | CMO      
Assets      
Trading Securities Debt 0 $ 88 5
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum      
Unobservable inputs      
Weighted average life (in years)   1 month 6 days  
Yield   4.90%  
Weighted average prepayment speed (annual rate)   8.30%  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum      
Unobservable inputs      
Weighted average life (in years)   6 months  
Yield   5.40%  
Weighted average prepayment speed (annual rate)   27.80%  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average      
Unobservable inputs      
Weighted average life (in years)   3 months 18 days  
Yield   4.90%  
Weighted average prepayment speed (annual rate)   9.20%  
Recurring | Level 3 | Other      
Assets      
Trading Securities Debt $ 166 $ 199 $ 167
Recurring | Level 3 | Other | Trading account debt securities | Discounted cash flow approach | Weighted Average      
Unobservable inputs      
Weighted average life (in years) 2 years 3 months 18 days 2 years 6 months  
Yield 12.00% 12.00%  
Weighted average prepayment speed (annual rate) 10.80% 10.80%  
Nonrecurring | Level 3 | Loans held in portfolio      
Assets      
Loans $ 110 $ 1,560  
Nonrecurring | Level 3 | Loans held in portfolio | Valuation Technique External Appraisal | Weighted Average      
Unobservable inputs      
Haircut applied on external appraisal 10.00% 35.00%