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Fair value measurement - Quantitative inputs level 3 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets      
Trading Securities Debt $ 40,321 $ 37,787  
Mortgage servicing rights 150,906 169,777 $ 168,031
Other real estate 122,072 136,705  
Recurring      
Assets      
Trading Securities Debt 40,321 37,787  
Mortgage servicing rights 150,906 169,777  
Recurring | CMO      
Assets      
Trading Securities Debt 606 659  
Recurring | Other      
Assets      
Trading Securities Debt 3,443 3,459  
Recurring | Level 3      
Assets      
Trading Securities Debt 970 1,139  
Mortgage servicing rights 150,906 169,777  
Recurring | Level 3 | Mortgage Servicing Rights      
Assets      
Mortgage servicing rights $ 150,906 $ 169,777  
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 0.20% 0.20%  
Discount rate 9.50% 9.50%  
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Maximum      
Unobservable inputs      
Weighted average life 14 years 4 months 24 days 17 years 4 months 24 days  
Prepayment speed 18.50% 17.80%  
Discount rate 14.70% 15.00%  
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Weighted Average      
Unobservable inputs      
Weighted average life 6 years 6 months 6 years 9 months 18 days  
Prepayment speed 6.00% 5.30%  
Discount rate 11.10% 11.20%  
Recurring | Level 3 | CMO      
Assets      
Trading Securities Debt $ 530 $ 611  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum      
Unobservable inputs      
Weighted average life 1 year 3 months 18 days 1 year 3 months 18 days  
Yield 3.90% 3.90%  
Prepayment speed 14.80% 16.30%  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum      
Unobservable inputs      
Weighted average life 1 year 9 months 18 days 2 years 1 month 6 days  
Yield 4.40% 4.40%  
Prepayment speed 20.70% 20.70%  
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average      
Unobservable inputs      
Weighted average life 1 year 7 months 6 days 1 year 10 months 24 days  
Yield 4.00% 4.10%  
Prepayment speed 18.30% 18.90%  
Recurring | Level 3 | Other      
Assets      
Trading Securities Debt $ 440 $ 485  
Recurring | Level 3 | Other | Trading account debt securities | Discounted cash flow approach      
Unobservable inputs      
Weighted average life 3 years 9 months 18 days 5 years 2 months 12 days  
Yield 12.00% 12.00%  
Prepayment speed 10.80% 10.80%  
Recurring | Level 3 | Other | Mortgage Servicing Rights | Discounted cash flow approach | Minimum      
Unobservable inputs      
Prepayment speed 0.20%    
Recurring | Level 3 | Other | Mortgage Servicing Rights | Discounted cash flow approach | Maximum      
Unobservable inputs      
Prepayment speed 18.50%    
Nonrecurring      
Assets      
Loans $ 35,363 $ 73,893 64,041
Other real estate 18,132 43,463 89,743
Nonrecurring | Level 3      
Assets      
Loans 35,363 73,893 64,041
Other real estate 18,132 43,463 $ 89,743
Nonrecurring | Level 3 | Loan      
Assets      
Loans $ 38,907 $ 61,020  
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal      
Unobservable inputs      
Haircut applied on external appraisal 10.00%    
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Minimum      
Unobservable inputs      
Haircut applied on external appraisal   10.30%  
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Maximum      
Unobservable inputs      
Haircut applied on external appraisal   10.00%  
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Weighted Average      
Unobservable inputs      
Haircut applied on external appraisal   20.00%  
Nonrecurring | Level 3 | Other real estate owned      
Assets      
Other real estate $ 16,119 $ 35,233  
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Minimum      
Unobservable inputs      
Haircut applied on external appraisal 5.00% 15.00%  
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 23.80% 24.70%