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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Assets        
Mortgage servicing rights $ 129,877 $ 119,467 $ 121,570 $ 118,395
Other real estate 92,137   85,077  
Recurring        
Assets        
Trading Securities Debt 32,317   29,711  
Mortgage servicing rights 129,877   121,570  
Contingent consideration (9,241)   (9,241)  
Recurring | CMO        
Assets        
Trading Securities Debt 203   257  
Recurring | Other        
Assets        
Trading Securities Debt 264   280  
Recurring | Level 3        
Assets        
Trading Securities Debt 416   478  
Mortgage servicing rights 129,877   121,570  
Contingent consideration (9,241)   (9,241)  
Recurring | Level 3 | Mortgage Servicing Rights        
Assets        
Mortgage servicing rights   $ 119,467    
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Minimum        
Unobservable inputs        
Weighted average life (in years)   1 month 6 days    
Prepayment speed   0.30%    
Discount rate   9.50%    
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Maximum        
Unobservable inputs        
Weighted average life (in years)   13 years 1 month 6 days    
Prepayment speed   33.10%    
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 2 months 12 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 $ 152 $ 250 198  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum        
Unobservable inputs        
Weighted average life (in years) 3 months 18 days 3 months 18 days    
Yield 4.20% 3.60%    
Prepayment speed 12.00% 10.20%    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum        
Unobservable inputs        
Weighted average life (in years) 9 months 18 days 1 year 2 months 12 days    
Yield 4.80% 4.10%    
Prepayment speed 16.30% 18.10%    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average        
Unobservable inputs        
Weighted average life (in years) 7 months 6 days 1 year    
Yield 4.20% 3.60%    
Prepayment speed 12.50% 13.10%    
Recurring | Level 3 | Other        
Assets        
Trading Securities Debt $ 264 $ 361 $ 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 $ 6,694 $ 19,369    
Other real estate 2,161 7,942    
Nonrecurring | Level 3        
Assets        
Loans 6,694 19,369    
Other real estate 2,161 7,942    
Nonrecurring | Level 3 | Loan        
Assets        
Loans $ 3,779 $ 18,565    
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   10.00%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Maximum        
Unobservable inputs        
Haircut applied on external appraisal   30.50%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal   11.10%    
Nonrecurring | Level 3 | Other real estate owned        
Assets        
Other real estate $ 76 $ 6,672    
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal        
Unobservable inputs        
Haircut applied on external appraisal 5.00%      
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   20.30%