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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Assets        
Trading Securities Debt $ 42,545   $ 40,321  
Mortgage servicing rights 147,311 $ 167,813 150,906 $ 169,777
Other real estate 123,922   122,072  
Recurring        
Assets        
Trading Securities Debt 42,545   40,321  
Mortgage servicing rights 147,311   150,906  
Recurring | CMO        
Assets        
Trading Securities Debt 543   606  
Recurring | Other        
Assets        
Trading Securities Debt 3,424   3,443  
Recurring | Level 3        
Assets        
Trading Securities Debt 895   970  
Mortgage servicing rights 147,311   150,906  
Recurring | Level 3 | Mortgage Servicing Rights        
Assets        
Mortgage servicing rights $ 147,311 $ 167,813    
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 14 years 3 months 18 days 15 years 7 months 6 days    
Prepayment speed 18.90% 23.20%    
Discount rate 14.70% 24.50%    
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Weighted Average        
Unobservable inputs        
Weighted average life 7 years 2 months 12 days 6 years 9 months 18 days    
Prepayment speed 6.30% 5.40%    
Discount rate 11.10% 11.20%    
Recurring | Level 3 | CMO        
Assets        
Trading Securities Debt $ 467 $ 595 530  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum        
Unobservable inputs        
Weighted average life 1 month 6 days 1 year 2 months 12 days    
Yield 3.70% 3.90%    
Prepayment speed 14.50% 15.00%    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum        
Unobservable inputs        
Weighted average life 1 year 7 months 6 days 2 years    
Yield 4.30% 4.40%    
Prepayment speed 21.20% 19.60%    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average        
Unobservable inputs        
Weighted average life 1 year 6 months 1 year 9 months 18 days    
Yield 3.80% 4.10%    
Prepayment speed 18.40% 17.70%    
Recurring | Level 3 | Other        
Assets        
Trading Securities Debt $ 428 $ 478 $ 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 $ 3,151 $ 13,147    
Other real estate 10,742 8,035    
Nonrecurring | Level 3        
Assets        
Loans 3,151 13,147    
Other real estate 10,742 8,035    
Nonrecurring | Level 3 | Loan        
Assets        
Loans $ 3,151 $ 9,610    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal        
Unobservable inputs        
Haircut applied on external appraisal 10.00%      
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Minimum        
Unobservable inputs        
Haircut applied on external appraisal   11.40%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Maximum        
Unobservable inputs        
Haircut applied on external appraisal   25.00%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal   13.80%    
Nonrecurring | Level 3 | Other real estate owned        
Assets        
Other real estate $ 7,050 $ 5,871    
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Minimum        
Unobservable inputs        
Haircut applied on external appraisal 5.00% 15.00%    
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Maximum        
Unobservable inputs        
Haircut applied on external appraisal 30.00% 25.00%    
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal 22.30% 21.20%