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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Assets      
Mortgage servicing rights $ 128,350 $ 121,570 $ 118,395
Other real estate 89,126 85,077  
Recurring      
Assets      
Trading Securities Debt 27,723 29,711  
Mortgage servicing rights 128,350 121,570  
Contingent consideration   (9,241)  
Recurring | CMO      
Assets      
Trading Securities Debt 160 257  
Recurring | Other      
Assets      
Trading Securities Debt 207 280  
Recurring | Level 3      
Assets      
Trading Securities Debt 535 478  
Mortgage servicing rights 128,350 121,570  
Contingent consideration   (9,241)  
Recurring | Level 3 | CMO      
Assets      
Trading Securities Debt $ 113 $ 198  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum      
Unobservable inputs      
Weighted average life (in years) 1 month 6 days 4 months 24 days  
Yield 4.90% 3.60%  
Weighted average prepayment speed (annual rate) 9.10% 10.10%  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum      
Unobservable inputs      
Weighted average life (in years) 7 months 6 days 1 year  
Yield 5.40% 4.10%  
Weighted average prepayment speed (annual rate) 32.00% 17.20%  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average      
Unobservable inputs      
Weighted average life (in years) 4 months 24 days 9 months 18 days  
Yield 4.90% 3.60%  
Weighted average prepayment speed (annual rate) 10.20% 11.40%  
Recurring | Level 3 | Other      
Assets      
Trading Securities Debt $ 207 $ 280  
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) 0.108% 10.80%  
Nonrecurring      
Assets      
Loans $ 11,215 $ 21,167 74,511
Other real estate 3,992 7,727 20,123
Nonrecurring | Level 3      
Assets      
Loans 11,215 21,167 74,511
Other real estate 3,992 7,727 $ 20,123
Nonrecurring | Level 3 | Loan      
Assets      
Loans $ 5,087 $ 20,041  
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 10.40%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Weighted Average      
Unobservable inputs      
Haircut applied on external appraisal 8.30% 5.00%  
Nonrecurring | Level 3 | Other real estate owned      
Assets      
Other real estate $ 528 $ 3,631  
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Minimum      
Unobservable inputs      
Haircut applied on external appraisal 5.00% 5.00%  
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Maximum      
Unobservable inputs      
Haircut applied on external appraisal 35.00% 35.00%  
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Weighted Average      
Unobservable inputs      
Haircut applied on external appraisal 18.40% 22.30%