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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Assets        
Mortgage servicing rights $ 116,567 $ 123,552 $ 118,395 $ 150,906
Other real estate 76,828   83,146  
Recurring        
Assets        
Trading Securities Debt 36,064   36,674  
Mortgage servicing rights 116,567   118,395  
Recurring | CMO        
Assets        
Trading Securities Debt 281   346  
Recurring | Other        
Assets        
Trading Securities Debt 352   381  
Recurring | Level 3        
Assets        
Trading Securities Debt 572   659  
Mortgage servicing rights 116,567   118,395  
Recurring | Level 3 | Mortgage Servicing Rights        
Assets        
Mortgage servicing rights $ 116,567 $ 123,552    
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Minimum        
Unobservable inputs        
Weighted average life 1 month 6 days 1 month 6 days    
Prepayment speed 0.30% 0.20%    
Discount rate 9.50% 9.50%    
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Maximum        
Unobservable inputs        
Weighted average life 13 years 1 month 6 days 12 years 3 months 18 days    
Prepayment speed 34.20% 22.10%    
Discount rate 14.70% 14.70%    
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Weighted Average        
Unobservable inputs        
Weighted average life 6 years 1 month 6 days 6 years 1 month 6 days    
Prepayment speed 6.20% 6.90%    
Discount rate 11.10% 11.20%    
Recurring | Level 3 | CMO        
Assets        
Trading Securities Debt $ 220 $ 410 278  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum        
Unobservable inputs        
Weighted average life 1 month 6 days 7 months 6 days    
Yield 3.60% 3.60%    
Prepayment speed 10.10% 13.80%    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum        
Unobservable inputs        
Weighted average life 1 year 1 month 6 days 1 year 6 months    
Yield 4.10% 4.10%    
Prepayment speed 16.70% 18.40%    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average        
Unobservable inputs        
Weighted average life 10 months 24 days 1 year 3 months 18 days    
Yield 3.60% 3.70%    
Prepayment speed 11.40% 17.70%    
Recurring | Level 3 | Other        
Assets        
Trading Securities Debt $ 352 $ 413 $ 381  
Recurring | Level 3 | Other | Trading account debt securities | Discounted cash flow approach        
Unobservable inputs        
Weighted average life 3 years 7 months 6 days 3 years 9 months 18 days    
Yield 12.00% 12.00%    
Prepayment speed 10.80% 10.80%    
Nonrecurring        
Assets        
Loans $ 22,700 $ 96,740    
Other real estate 6,540 19,475    
Nonrecurring | Level 3        
Assets        
Loans 22,700 96,740    
Other real estate 6,540 19,475    
Nonrecurring | Level 3 | Loan        
Assets        
Loans $ 21,715 $ 96,740    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Minimum        
Unobservable inputs        
Haircut applied on external appraisal 10.00% 21.00%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Maximum        
Unobservable inputs        
Haircut applied on external appraisal 30.50% 40.00%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal 11.00% 23.20%    
Nonrecurring | Level 3 | Other real estate owned        
Assets        
Other real estate $ 4,099 $ 13,826    
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% 30.00%    
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal 22.30% 21.50%