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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Assets        
Trading Securities Debt $ 33,053   $ 40,321  
Mortgage servicing rights 123,552 $ 150,652 150,906 $ 169,777
Other real estate 100,592   122,072  
Recurring        
Assets        
Trading Securities Debt 33,053   40,321  
Mortgage servicing rights 123,552   150,906  
Recurring | CMO        
Assets        
Trading Securities Debt 484   606  
Recurring | Other        
Assets        
Trading Securities Debt 3,414   3,443  
Recurring | Level 3        
Assets        
Trading Securities Debt 823   970  
Mortgage servicing rights 123,552   150,906  
Recurring | Level 3 | Mortgage Servicing Rights        
Assets        
Mortgage servicing rights $ 123,552 $ 150,652    
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 0.20% 0.20%    
Discount rate 9.50% 9.50%    
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Maximum        
Unobservable inputs        
Weighted average life 12 years 3 months 18 days 13 years 10 months 24 days    
Prepayment speed 22.10% 19.90%    
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 2 months 12 days    
Prepayment speed 6.90% 6.80%    
Discount rate 11.20% 11.20%    
Recurring | Level 3 | CMO        
Assets        
Trading Securities Debt $ 410 $ 557 530  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum        
Unobservable inputs        
Weighted average life 7 months 6 days 1 year 4 months 24 days    
Yield 3.60% 3.90%    
Prepayment speed 13.80% 15.20%    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum        
Unobservable inputs        
Weighted average life 1 year 6 months 1 year 9 months 18 days    
Yield 4.10% 4.40%    
Prepayment speed 18.40% 20.70%    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average        
Unobservable inputs        
Weighted average life 1 year 3 months 18 days 1 year 8 months 12 days    
Yield 3.70% 4.00%    
Prepayment speed 17.70% 18.50%    
Recurring | Level 3 | Other        
Assets        
Trading Securities Debt $ 413 $ 456 $ 440  
Recurring | Level 3 | Other | Trading account debt securities | Discounted cash flow approach        
Unobservable inputs        
Weighted average life 3 years 9 months 18 days 5 years 2 months 12 days    
Yield 12.00% 12.00%    
Prepayment speed 10.80% 10.80%    
Nonrecurring        
Assets        
Loans $ 96,740 $ 65,922    
Other real estate 19,475 17,942    
Nonrecurring | Level 3        
Assets        
Loans 96,740 65,922    
Other real estate 19,475 17,942    
Nonrecurring | Level 3 | Loan        
Assets        
Loans $ 96,740 $ 62,442    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Minimum        
Unobservable inputs        
Haircut applied on external appraisal 21.00% 10.00%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Maximum        
Unobservable inputs        
Haircut applied on external appraisal 40.00% 21.00%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal 23.20% 10.30%    
Nonrecurring | Level 3 | Other real estate owned        
Assets        
Other real estate $ 13,826 $ 15,003    
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Minimum        
Unobservable inputs        
Haircut applied on external appraisal 5.00% 10.00%    
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Maximum        
Unobservable inputs        
Haircut applied on external appraisal 30.00% 35.00%    
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal 21.50% 23.50%