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Note Fair value measurement (Quantitative inputs level 3) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Assets        
Trading Securities Debt $ 39,217 $ 37,787    
Mortgage servicing rights 167,813 169,777 $ 166,281 $ 168,031
Other real estate 125,478 136,705    
Level 3        
Assets        
Trading Securities Debt [1] 1,116 1,139    
Mortgage servicing rights 167,813 169,777    
Recurring        
Assets        
Trading Securities Debt 39,217 37,787    
Mortgage servicing rights 167,813 169,777    
Recurring | CMO        
Assets        
Trading Securities Debt 642 659    
Recurring | Other        
Assets        
Trading Securities Debt 3,453 3,459    
Recurring | Level 3        
Assets        
Trading Securities Debt 1,116 1,139    
Mortgage servicing rights 167,813 169,777    
Recurring | Level 3 | Mortgage Servicing Rights        
Assets        
Mortgage servicing rights $ 167,813      
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Minimum        
Unobservable inputs        
Weighted average life 1 month      
Prepayment speed 0.20%      
Discount rate 9.50%      
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Maximum        
Unobservable inputs        
Weighted average life 15 years 7 months      
Prepayment speed 23.20%      
Discount rate 24.50%      
Recurring | Level 3 | Mortgage Servicing Rights | Discounted cash flow approach | Weighted Average        
Unobservable inputs        
Weighted average life 6 years 10 months      
Prepayment speed 5.40%      
Discount rate 11.20%      
Recurring | Level 3 | CMO        
Assets        
Trading Securities Debt $ 595 611    
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Minimum        
Unobservable inputs        
Weighted average life 1 year 2 months      
Yield 3.90%      
Prepayment speed 15.00%      
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Maximum        
Unobservable inputs        
Weighted average life 2 years      
Yield 4.40%      
Prepayment speed 19.60%      
Recurring | Level 3 | CMO | Trading account debt securities | Discounted cash flow approach | Weighted Average        
Unobservable inputs        
Weighted average life 1 year 10 months      
Yield 4.10%      
Prepayment speed 17.70%      
Recurring | Level 3 | Other        
Assets        
Trading Securities Debt $ 478 $ 485    
Recurring | Level 3 | Other | Discounted cash flow approach        
Unobservable inputs        
Weighted average life 5 years 2 months      
Yield 12.00%      
Prepayment speed 10.80%      
Nonrecurring        
Assets        
Loans [2] $ 13,147      
Nonrecurring | Level 3 | Loan        
Assets        
Loans [3] $ 9,610      
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Minimum        
Unobservable inputs        
Haircut applied on external appraisal 11.40%      
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Maximum        
Unobservable inputs        
Haircut applied on external appraisal 25.00%      
Nonrecurring | Level 3 | Loan | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal 13.80%      
Nonrecurring | Level 3 | Other real estate owned        
Assets        
Other real estate [4] $ 5,871      
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Minimum        
Unobservable inputs        
Haircut applied on external appraisal 15.00%      
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Maximum        
Unobservable inputs        
Haircut applied on external appraisal 25.00%      
Nonrecurring | Level 3 | Other real estate owned | Valuation Technique External Appraisal | Weighted Average        
Unobservable inputs        
Haircut applied on external appraisal 21.20%      
[1]

Refer to Note 24 to the C onsolidated F inancial S tatements 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.