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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Assets        
Mortgage servicing rights $ 119,467 $ 141,144 $ 118,395 $ 150,906
Other real estate 73,272   83,146  
Recurring        
Assets        
Trading Securities Debt 35,931   36,674  
Mortgage servicing rights 119,467   118,395  
Recurring | CMO        
Assets        
Trading Securities Debt 314   346  
Recurring | Other        
Assets        
Trading Securities Debt 361   381  
Recurring | Level 3        
Assets        
Trading Securities Debt 611   659  
Mortgage servicing rights 119,467   118,395  
Recurring | Level 3 | Mortgage Servicing Rights        
Assets        
Mortgage servicing rights $ 119,467 $ 141,144    
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% 0.30%    
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 14 years 4 months 24 days    
Prepayment speed 33.10% 24.60%    
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 6 years 2 months 12 days    
Prepayment speed 6.00% 6.70%    
Discount rate 11.10% 11.20%    
Recurring | Level 3 | CMO        
Assets        
Trading Securities Debt $ 250 $ 442 278  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum        
Unobservable inputs        
Weighted average life 3 months 18 days 8 months 12 days    
Yield 3.60% 3.70%    
Prepayment speed 10.20% 15.20%    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum        
Unobservable inputs        
Weighted average life 1 year 2 months 12 days 1 year 6 months    
Yield 4.10% 4.30%    
Prepayment speed 18.10% 19.60%    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average        
Unobservable inputs        
Weighted average life 1 year 1 year 4 months 24 days    
Yield 3.60% 3.80%    
Prepayment speed 13.10% 18.30%    
Recurring | Level 3 | Other        
Assets        
Trading Securities Debt $ 361 $ 423 $ 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 $ 19,369 $ 5,121    
Other real estate 7,942 17,581    
Nonrecurring | Level 3        
Assets        
Loans 19,369 5,121    
Other real estate 7,942 17,581    
Nonrecurring | Level 3 | Loan        
Assets        
Loans $ 18,565 $ 5,121    
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 30.50% 40.10%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal 11.10% 24.60%    
Nonrecurring | Level 3 | Other real estate owned        
Assets        
Other real estate $ 6,672 $ 11,853    
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 20.30% 21.70%