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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Recurring      
Assets      
Trading Securities Debt $ 29,823   $ 27,723
Recurring | CMO      
Assets      
Trading Securities Debt 133   160
Recurring | Other      
Assets      
Trading Securities Debt 199   207
Recurring | Level 3      
Assets      
Trading Securities Debt 475   535
Recurring | Level 3 | CMO      
Assets      
Trading Securities Debt $ 88 $ 174 113
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum      
Unobservable inputs      
Weighted average life (in years) 1 month 6 days 6 months  
Yield 4.90% 3.90%  
Weighted average prepayment speed (annual rate) 8.30% 0.10%  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum      
Unobservable inputs      
Weighted average life (in years) 6 months 1 year  
Yield 5.40% 4.50%  
Weighted average prepayment speed (annual rate) 27.80% 15.70%  
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 8 months 12 days  
Yield 4.90% 3.90%  
Weighted average prepayment speed (annual rate) 9.20% 8.40%  
Recurring | Level 3 | Other      
Assets      
Trading Securities Debt $ 199 $ 267 $ 207
Recurring | Level 3 | Other | Trading account debt securities | Discounted cash flow approach      
Unobservable inputs      
Weighted average life (in years) 2 years 6 months 2 years 10 months 24 days  
Yield 12.00% 12.00%  
Weighted average prepayment speed (annual rate) 10.80% 10.80%  
Nonrecurring | Level 3 | Loan      
Assets      
Loans $ 1,560 $ 4,653  
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Weighted Average      
Unobservable inputs      
Haircut applied on external appraisal 35.00% 12.60%  
Nonrecurring | Level 3 | Contingent consideration      
Assets      
Contingent consideration   $ (9,241)  
Nonrecurring | Level 3 | Contingent consideration | Probability weighted discounted cash flows      
Unobservable inputs      
Discount rate   2.52%