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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Assets        
Mortgage servicing rights $ 125,358 $ 122,543 $ 121,570 $ 118,395
Other real estate 90,567   85,077  
Recurring        
Assets        
Trading Securities Debt 36,040   29,711  
Mortgage servicing rights 125,358   121,570  
Contingent consideration (9,241)   (9,241)  
Recurring | CMO        
Assets        
Trading Securities Debt 227   257  
Recurring | Other        
Assets        
Trading Securities Debt 267   280  
Recurring | Level 3        
Assets        
Trading Securities Debt 441   478  
Mortgage servicing rights 125,358   121,570  
Contingent consideration (9,241)   (9,241)  
Recurring | Level 3 | Mortgage Servicing Rights        
Assets        
Mortgage servicing rights   $ 122,543    
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Minimum        
Unobservable inputs        
Weighted average life (in years)   1 month 6 days    
Prepayment speed   0.40%    
Discount rate   9.50%    
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Maximum        
Unobservable inputs        
Weighted average life (in years)   12 years 9 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 (in years)   6 years 3 months 18 days    
Prepayment speed   6.00%    
Discount rate   11.10%    
Recurring | Level 3 | Contingent consideration        
Assets        
Contingent consideration $ (9,241)      
Recurring | Level 3 | Contingent consideration | Probability weighted discounted cash flows        
Unobservable inputs        
Discount rate 2.52%      
Recurring | Level 3 | CMO        
Assets        
Trading Securities Debt $ 174 $ 251 198  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum        
Unobservable inputs        
Weighted average life (in years) 6 months 3 months 18 days    
Yield 3.90% 3.60%    
Prepayment speed 0.10% 10.40%    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum        
Unobservable inputs        
Weighted average life (in years) 1 year 1 year 3 months 18 days    
Yield 4.50% 4.10%    
Prepayment speed 15.70% 18.30%    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average        
Unobservable inputs        
Weighted average life (in years) 8 months 12 days 1 year 1 month 6 days    
Yield 3.90% 3.60%    
Prepayment speed 8.40% 12.90%    
Recurring | Level 3 | Other        
Assets        
Trading Securities Debt $ 267 $ 372 $ 280  
Recurring | Level 3 | Other | Trading account debt securities | Discounted cash flow approach        
Unobservable inputs        
Weighted average life (in years) 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 $ 4,891 $ 2,384    
Other real estate 1,432 6,205    
Nonrecurring | Level 3        
Assets        
Loans 4,891 2,384    
Other real estate 1,432 6,205    
Nonrecurring | Level 3 | Loan        
Assets        
Loans $ 4,653 $ 2,162    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal        
Unobservable inputs        
Haircut applied on external appraisal 12.60%      
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Minimum        
Unobservable inputs        
Haircut applied on external appraisal   12.60%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Maximum        
Unobservable inputs        
Haircut applied on external appraisal   21.40%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal   16.30%    
Nonrecurring | Level 3 | Other real estate owned        
Assets        
Other real estate   $ 5,772    
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Minimum        
Unobservable inputs        
Haircut applied on external appraisal   5.00%    
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Maximum        
Unobservable inputs        
Haircut applied on external appraisal   35.00%    
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal   22.10%