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Note Fair value measurement (Quantitative inputs level 3) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets      
Trading Securities Debt $ 37,787 $ 33,926  
Mortgage servicing rights 169,777 168,031 $ 196,889
Level 3      
Assets      
Trading Securities Debt 1,139 [1] 1,101  
Mortgage servicing rights 169,777 168,031  
Recurring      
Assets      
Trading Securities Debt 37,787 33,746  
Mortgage servicing rights 169,777 168,031  
Recurring | Level 3      
Assets      
Trading Securities Debt 1,139 1,101  
Mortgage servicing rights 169,777 168,031  
Nonrecurring      
Assets      
Loans [2] 73,893   $ 79,175
Mortgage Servicing Rights | Recurring | Level 3      
Assets      
Mortgage servicing rights $ 169,777    
Mortgage Servicing Rights | Recurring | Discounted cash flow approach | Maximum | Level 3      
Unobservable inputs      
Weighted average life 17 years 5 months    
Prepayment speed 17.80%    
Discount rate 15.00%    
Mortgage Servicing Rights | Recurring | Discounted cash flow approach | Minimum | Level 3      
Unobservable inputs      
Weighted average life 1 month    
Prepayment speed 0.20%    
Discount rate 9.50%    
Mortgage Servicing Rights | Recurring | Discounted cash flow approach | Weighted Average | Level 3      
Unobservable inputs      
Weighted average life 6 years 10 months    
Prepayment speed 5.30%    
Discount rate 11.20%    
Loan | Nonrecurring | Level 3      
Assets      
Loans [3] $ 61,020    
Loan | Nonrecurring | Valuation Technique External Appraisal | Maximum | Level 3      
Unobservable inputs      
Haircut Applied On External Appraisal 20.00%    
Loan | Nonrecurring | Valuation Technique External Appraisal | Minimum | Level 3      
Unobservable inputs      
Haircut Applied On External Appraisal 10.00%    
Loan | Nonrecurring | Valuation Technique External Appraisal | Weighted Average | Level 3      
Unobservable inputs      
Haircut Applied On External Appraisal 10.30%    
Other real estate owned | Nonrecurring | Level 3      
Assets      
Other real estate owned [4] $ 35,233    
Other real estate owned | Nonrecurring | Valuation Technique External Appraisal | Maximum | Level 3      
Unobservable inputs      
Haircut Applied On External Appraisal 30.00%    
Other real estate owned | Nonrecurring | Valuation Technique External Appraisal | Minimum | Level 3      
Unobservable inputs      
Haircut Applied On External Appraisal 15.00%    
Other real estate owned | Nonrecurring | Valuation Technique External Appraisal | Weighted Average | Level 3      
Unobservable inputs      
Haircut Applied On External Appraisal 24.70%    
CMO | Recurring      
Assets      
Trading Securities Debt $ 659 529  
CMO | Recurring | Level 3      
Assets      
Trading Securities Debt $ 611 529  
CMO | Trading account debt securities | Recurring | Discounted cash flow approach | Maximum | Level 3      
Unobservable inputs      
Weighted average life 2 years 1 month    
Yield 4.40%    
Prepayment speed 20.70%    
CMO | Trading account debt securities | Recurring | Discounted cash flow approach | Minimum | Level 3      
Unobservable inputs      
Weighted average life 1 year 4 months    
Yield 3.90%    
Prepayment speed 16.30%    
CMO | Trading account debt securities | Recurring | Discounted cash flow approach | Weighted Average | Level 3      
Unobservable inputs      
Weighted average life 1 year 11 months    
Yield 4.10%    
Prepayment speed 18.90%    
Other | Recurring      
Assets      
Trading Securities Debt $ 3,459 3,517  
Other | Recurring | Level 3      
Assets      
Trading Securities Debt $ 485 $ 529  
Other | Recurring | Discounted cash flow approach | Level 3      
Unobservable inputs      
Weighted average life 5 years 2 months    
Yield 12.00%    
Prepayment speed 10.80%    
[1]
Refer to Note 29 to the Consolidated Financial Statements for the fair value by class of financial asset and its hierarchy level.
[2]

Relates mostly to certain impaired collateral dependent loans. The impairment was measured based on the fair value of the collateral, which is derived from appraisals that take into consideration prices in observed transactions involving similar assets in similar locations, in accordance with the provisions of ASC Section 310-10-35 . Costs to sell are excluded from the reported fair value amount .

[3]
Loans held-in-portfolio in which haircuts were not applied to external appraisals were excluded from this table.
[4]
Other real estate owned in which haircuts were not applied to external appraisals were excluded from this table.