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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Recurring      
Assets      
Trading Securities Debt $ 29,035   $ 27,723
Recurring | CMO      
Assets      
Trading Securities Debt 98   160
Recurring | Other      
Assets      
Trading Securities Debt 191   207
Recurring | Level 3      
Assets      
Trading Securities Debt 410   535
Recurring | Level 3 | CMO      
Assets      
Trading Securities Debt $ 56 $ 152 113
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum      
Unobservable inputs      
Weighted average life (in years) 2 months 12 days 3 months 18 days  
Yield 4.90% 4.20%  
Weighted average prepayment speed (annual rate) 7.70% 12.00%  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum      
Unobservable inputs      
Weighted average life (in years) 4 months 24 days 9 months 18 days  
Yield 5.40% 4.80%  
Weighted average prepayment speed (annual rate) 25.00% 16.30%  
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 7 months 6 days  
Yield 4.90% 4.20%  
Weighted average prepayment speed (annual rate) 7.90% 12.50%  
Recurring | Level 3 | Other      
Assets      
Trading Securities Debt $ 191 $ 264 $ 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% 0.12%  
Weighted average prepayment speed (annual rate) 10.80% 10.80%  
Nonrecurring | Level 3 | Loan      
Assets      
Loans $ 18,854 $ 3,779  
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal      
Unobservable inputs      
Haircut applied on external appraisal   12.60%  
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Minimum      
Unobservable inputs      
Haircut applied on external appraisal 5.00%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Maximum      
Unobservable inputs      
Haircut applied on external appraisal 20.00%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Weighted Average      
Unobservable inputs      
Haircut applied on external appraisal 12.00%    
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal      
Assets      
Other real estate owned   $ 76  
Unobservable inputs      
Haircut applied on external appraisal   5.00%  
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%