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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets      
Mortgage servicing rights $ 118,395 $ 150,906 $ 169,777
Other real estate 83,146 122,072  
Recurring      
Assets      
Trading Securities Debt 36,674 40,321  
Mortgage servicing rights 118,395 150,906  
Recurring | CMO      
Assets      
Trading Securities Debt 346 606  
Recurring | Other      
Assets      
Trading Securities Debt 381 3,443  
Recurring | Level 3      
Assets      
Trading Securities Debt 659 970  
Mortgage servicing rights 118,395 150,906  
Recurring | Level 3 | Mortgage Servicing Rights      
Assets      
Mortgage servicing rights $ 118,395 $ 150,906  
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 12 years 3 months 18 days 14 years 4 months 24 days  
Prepayment speed 24.60% 18.50%  
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 6 years 6 months  
Prepayment speed 6.90% 6.00%  
Discount rate 11.10% 11.10%  
Recurring | Level 3 | CMO      
Assets      
Trading Securities Debt $ 278 $ 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 3 months 18 days  
Yield 3.60% 3.90%  
Prepayment speed 13.80% 14.80%  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum      
Unobservable inputs      
Weighted average life 1 year 4 months 24 days 1 year 9 months 18 days  
Yield 4.10% 4.40%  
Prepayment speed 18.30% 20.70%  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average      
Unobservable inputs      
Weighted average life 1 year 2 months 12 days 1 year 7 months 6 days  
Yield 3.60% 4.00%  
Prepayment speed 17.70% 18.30%  
Recurring | Level 3 | Other      
Assets      
Trading Securities Debt $ 381 $ 440  
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 $ 74,511 $ 35,363 73,893
Other real estate 20,123 18,132 43,463
Nonrecurring | Level 3      
Assets      
Loans 74,511 35,363 73,893
Other real estate 20,123 18,132 $ 43,463
Nonrecurring | Level 3 | Loan      
Assets      
Loans $ 74,347 $ 38,907  
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Minimum      
Unobservable inputs      
Haircut applied on external appraisal 10.00%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Maximum      
Unobservable inputs      
Haircut applied on external appraisal 40.00%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Weighted Average      
Unobservable inputs      
Haircut applied on external appraisal 20.90% 10.00%  
Nonrecurring | Level 3 | Other real estate owned      
Assets      
Other real estate $ 14,926 $ 16,119  
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 30.00% 35.00%  
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Weighted Average      
Unobservable inputs      
Haircut applied on external appraisal 22.10% 23.80%