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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Assets      
Mortgage servicing rights $ 121,570 $ 118,395 $ 150,906
Other real estate 85,077 83,146  
Recurring      
Assets      
Trading Securities Debt 29,711 36,674  
Mortgage servicing rights 121,570 118,395  
Recurring | CMO      
Assets      
Trading Securities Debt 257 346  
Recurring | Other      
Assets      
Trading Securities Debt 280 381  
Recurring | Level 3      
Assets      
Trading Securities Debt 478 659  
Mortgage servicing rights 121,570 118,395  
Recurring | Level 3 | Mortgage Servicing Rights      
Assets      
Mortgage servicing rights   $ 118,395  
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Minimum      
Unobservable inputs      
Weighted average life   3 months 18 days  
Prepayment speed   0.30%  
Discount rate   9.50%  
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Maximum      
Unobservable inputs      
Weighted average life   12 years 3 months 18 days  
Prepayment speed   24.60%  
Discount rate   14.70%  
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Weighted Average      
Unobservable inputs      
Weighted average life   6 years  
Prepayment speed   6.90%  
Discount rate   11.10%  
Recurring | Level 3 | CMO      
Assets      
Trading Securities Debt $ 198 $ 278  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum      
Unobservable inputs      
Weighted average life 14 days 7 months 6 days  
Yield 3.60% 3.60%  
Prepayment speed 10.10% 13.80%  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum      
Unobservable inputs      
Weighted average life 1 year 1 year 4 months 24 days  
Yield 4.10% 4.10%  
Prepayment speed 17.20% 18.30%  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average      
Unobservable inputs      
Weighted average life 9 months 18 days 1 year 2 months 12 days  
Yield 3.60% 3.60%  
Prepayment speed 11.40% 17.70%  
Recurring | Level 3 | Other      
Assets      
Trading Securities Debt $ 280 $ 381  
Recurring | Level 3 | Other | Trading account debt securities | Discounted cash flow approach      
Unobservable inputs      
Weighted average life 2 years 10 months 24 days 3 years 7 months 6 days  
Yield 12.00% 12.00%  
Prepayment speed 10.80% 10.80%  
Nonrecurring      
Assets      
Loans $ 21,167 $ 74,511 35,363
Other real estate 7,727 20,123 18,132
Nonrecurring | Level 3      
Assets      
Loans 21,167 74,511 35,363
Other real estate 7,727 20,123 $ 18,132
Nonrecurring | Level 3 | Loan      
Assets      
Loans $ 20,041 $ 74,347  
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal      
Unobservable inputs      
Haircut applied on external appraisal 5.00%    
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%  
Nonrecurring | Level 3 | Other real estate owned      
Assets      
Other real estate $ 3,631 $ 14,926  
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 22.30% 22.10%