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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Assets        
Trading Securities Debt $ 35,623 $ 37,787    
Mortgage servicing rights 153,021 169,777 $ 164,025 $ 168,031
Other real estate 118,851 136,705    
Recurring        
Assets        
Trading Securities Debt 35,623 37,787    
Mortgage servicing rights 153,021 169,777    
Recurring | CMO        
Assets        
Trading Securities Debt 698 659    
Recurring | Other        
Assets        
Trading Securities Debt 3,470 3,459    
Recurring | Level 3        
Assets        
Trading Securities Debt 1,112 1,139    
Mortgage servicing rights 153,021 169,777    
Recurring | Level 3 | Mortgage Servicing Rights        
Assets        
Mortgage servicing rights $ 153,021      
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Minimum        
Unobservable inputs        
Weighted average life 1 month 6 days      
Prepayment speed 0.20%      
Discount rate 9.50%      
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Maximum        
Unobservable inputs        
Weighted average life 15 years 1 month 6 days      
Prepayment speed 23.30%      
Discount rate 14.70%      
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Weighted Average        
Unobservable inputs        
Weighted average life 7 years 4 months 24 days      
Prepayment speed 6.10%      
Discount rate 11.20%      
Recurring | Level 3 | Loan | Valuation Technique External Appraisal | Minimum        
Unobservable inputs        
Haircut applied on external appraisal 10.00%      
Recurring | Level 3 | Loan | Valuation Technique External Appraisal | Maximum        
Unobservable inputs        
Haircut applied on external appraisal 35.00%      
Recurring | Level 3 | Loan | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal 10.20%      
Recurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Minimum        
Unobservable inputs        
Haircut applied on external appraisal 10.00%      
Recurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Maximum        
Unobservable inputs        
Haircut applied on external appraisal 35.00%      
Recurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal 24.00%      
Recurring | Level 3 | CMO        
Assets        
Trading Securities Debt $ 618 611    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum        
Unobservable inputs        
Weighted average life 1 year 1 month 6 days      
Yield 3.90%      
Prepayment speed 15.20%      
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum        
Unobservable inputs        
Weighted average life 1 year 10 months 24 days      
Yield 4.40%      
Prepayment speed 20.90%      
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average        
Unobservable inputs        
Weighted average life 1 year 8 months 12 days      
Yield 4.00%      
Prepayment speed 18.50%      
Recurring | Level 3 | Other        
Assets        
Trading Securities Debt $ 468 $ 485    
Recurring | Level 3 | Other | Trading account debt securities | Discounted cash flow approach        
Unobservable inputs        
Weighted average life 5 years 2 months 12 days      
Yield 12.00%      
Prepayment speed 10.80%      
Recurring | Level 3 | Other | Mortgage Servicing Rights | Discounted cash flow approach | Minimum        
Unobservable inputs        
Prepayment speed 0.20%      
Recurring | Level 3 | Other | Mortgage Servicing Rights | Discounted cash flow approach | Maximum        
Unobservable inputs        
Prepayment speed 23.30%      
Nonrecurring        
Assets        
Loans $ 41,793      
Nonrecurring | Level 3 | Loan        
Assets        
Loans 38,161      
Nonrecurring | Level 3 | Other real estate owned        
Assets        
Other real estate $ 12,596