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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Assets        
Trading Securities Debt $ 33,560   $ 40,321  
Mortgage servicing rights 141,144 $ 153,021 150,906 $ 169,777
Other real estate 113,940   122,072  
Recurring        
Assets        
Trading Securities Debt 33,560   40,321  
Mortgage servicing rights 141,144   150,906  
Recurring | CMO        
Assets        
Trading Securities Debt 518   606  
Recurring | Other        
Assets        
Trading Securities Debt 3,426   3,443  
Recurring | Level 3        
Assets        
Trading Securities Debt 865   970  
Mortgage servicing rights 141,144   150,906  
Recurring | Level 3 | Mortgage Servicing Rights        
Assets        
Mortgage servicing rights $ 141,144 $ 153,021    
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 14 years 4 months 24 days 15 years 1 month 6 days    
Prepayment speed 24.60% 23.30%    
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 2 months 12 days 7 years 4 months 24 days    
Prepayment speed 6.70% 6.10%    
Discount rate 11.20% 11.20%    
Recurring | Level 3 | CMO        
Assets        
Trading Securities Debt $ 442 $ 618 530  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum        
Unobservable inputs        
Weighted average life 8 months 12 days 1 year 1 month 6 days    
Yield 3.70% 3.90%    
Prepayment speed 15.20% 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 10 months 24 days    
Yield 4.30% 4.40%    
Prepayment speed 19.60% 20.90%    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average        
Unobservable inputs        
Weighted average life 1 year 4 months 24 days 1 year 8 months 12 days    
Yield 3.80% 4.00%    
Prepayment speed 18.30% 18.50%    
Recurring | Level 3 | Other        
Assets        
Trading Securities Debt $ 423 $ 468 $ 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 $ 5,121 $ 41,793    
Other real estate 17,581 15,065    
Nonrecurring | Level 3        
Assets        
Loans 5,121 41,793    
Other real estate 17,581 15,065    
Nonrecurring | Level 3 | Loan        
Assets        
Loans $ 5,121 $ 38,161    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Minimum        
Unobservable inputs        
Haircut applied on external appraisal 10.00% 10.00%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Maximum        
Unobservable inputs        
Haircut applied on external appraisal 40.10% 35.00%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal 24.60% 10.20%    
Nonrecurring | Level 3 | Other real estate owned        
Assets        
Other real estate $ 11,853 $ 12,596    
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 21.70% 24.00%