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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Assets        
Mortgage servicing rights $ 130,541 $ 116,567 $ 121,570 $ 118,395
Other real estate 93,239   85,077  
Recurring        
Assets        
Trading Securities Debt 30,271   29,711  
Mortgage servicing rights 130,541   121,570  
Contingent consideration     (9,241)  
Recurring | CMO        
Assets        
Trading Securities Debt 183   257  
Recurring | Other        
Assets        
Trading Securities Debt 255   280  
Recurring | Level 3        
Assets        
Trading Securities Debt 390   478  
Mortgage servicing rights 130,541   121,570  
Contingent consideration     (9,241)  
Recurring | Level 3 | Mortgage Servicing Rights        
Assets        
Mortgage servicing rights   $ 116,567    
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Minimum        
Unobservable inputs        
Weighted average life (in years)   1 month 6 days    
Weighted average prepayment speed (annual rate)   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    
Weighted average prepayment speed (annual rate)   34.20%    
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 1 month 6 days    
Weighted average prepayment speed (annual rate)   6.20%    
Discount rate   11.10%    
Recurring | Level 3 | CMO        
Assets        
Trading Securities Debt $ 135 $ 220 198  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum        
Unobservable inputs        
Weighted average life (in years) 2 months 12 days 1 month 6 days    
Yield 4.90% 3.60%    
Weighted average prepayment speed (annual rate) 10.10% 10.10%    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum        
Unobservable inputs        
Weighted average life (in years) 8 months 12 days 1 year 1 month 6 days    
Yield 5.40% 4.10%    
Weighted average prepayment speed (annual rate) 18.50% 16.70%    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average        
Unobservable inputs        
Weighted average life (in years) 6 months 10 months 24 days    
Yield 4.90% 3.60%    
Weighted average prepayment speed (annual rate) 10.70% 11.40%    
Recurring | Level 3 | Other        
Assets        
Trading Securities Debt $ 255 $ 352 $ 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%    
Weighted average prepayment speed (annual rate) 10.80% 10.80%    
Nonrecurring        
Assets        
Loans $ 9,933 $ 22,700    
Other real estate 3,067 6,540    
Nonrecurring | Level 3        
Assets        
Loans 9,933 22,700    
Other real estate 3,067 6,540    
Nonrecurring | Level 3 | Loan        
Assets        
Loans $ 4,473 $ 21,715    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Minimum        
Unobservable inputs        
Haircut applied on external appraisal 5.00% 10.00%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Maximum        
Unobservable inputs        
Haircut applied on external appraisal 25.00% 30.50%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal 16.10% 11.00%    
Nonrecurring | Level 3 | Other real estate owned        
Assets        
Other real estate $ 289 $ 4,099    
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% 35.00%    
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal 27.00% 22.30%