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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Recurring      
Assets      
Trading Securities Debt $ 28,012   $ 31,568
Recurring | CMO      
Assets      
Trading Securities Debt 87   98
Recurring | Other      
Assets      
Trading Securities Debt 158   167
Recurring | Level 3      
Assets      
Trading Securities Debt 242   284
Recurring | Level 3 | CMO      
Assets      
Trading Securities Debt 0 $ 56 5
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum      
Unobservable inputs      
Weighted average life (in years)   2 months 12 days  
Yield   4.90%  
Weighted average prepayment speed (annual rate)   7.70%  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum      
Unobservable inputs      
Weighted average life (in years)   4 months 24 days  
Yield   5.40%  
Weighted average prepayment speed (annual rate)   25.00%  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average      
Unobservable inputs      
Weighted average life (in years)   2 months 12 days  
Yield   4.90%  
Weighted average prepayment speed (annual rate)   7.90%  
Recurring | Level 3 | Other      
Assets      
Trading Securities Debt $ 158 $ 191 $ 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 $ 2,039 $ 18,854  
Nonrecurring | Level 3 | Loans held in portfolio | Valuation Technique External Appraisal | Minimum      
Unobservable inputs      
Haircut applied on external appraisal   5.00%  
Nonrecurring | Level 3 | Loans held in portfolio | Valuation Technique External Appraisal | Maximum      
Unobservable inputs      
Haircut applied on external appraisal   20.00%  
Nonrecurring | Level 3 | Loans held in portfolio | Valuation Technique External Appraisal | Weighted Average      
Unobservable inputs      
Haircut applied on external appraisal 10.00% 12.00%