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Note Hurricanes Impact - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Hurricanes Impact [Line Items]      
Provision for Loan and Lease Losses $ 325,424 $ 170,016 $ 241,478
Change Allowance For Loan Losses Recalibration And Enhancements Of The Enviromental Factors Adjustments 4,900    
Adjustments To Indemnity Reserves On Loans Sold (22,377) (17,285) (18,628)
Allowance for loan losses 623,426 540,651 537,111
Financial Guarantee      
Hurricanes Impact [Line Items]      
Valuation Allowances And Reserves Balance 58,820 54,489 58,663
Loans with Recourse      
Hurricanes Impact [Line Items]      
Loans serviced 1,500,000 1,700,000  
Covered loans      
Hurricanes Impact [Line Items]      
Provision for Loan and Lease Losses 5,742 $ (1,110) $ 24,020
Change Allowance For Loan Losses Recalibration And Enhancements Of The Enviromental Factors Adjustments 1,600    
Non Covered Loans      
Hurricanes Impact [Line Items]      
Change Allowance For Loan Losses Recalibration And Enhancements Of The Enviromental Factors Adjustments 6,500    
Hurricanes      
Hurricanes Impact [Line Items]      
Insurance recoveries 1,100    
Provision for Loan and Lease Losses 67,615    
Change Allowance For Loan Losses Recalibration And Enhancements Of The Enviromental Factors Adjustments 60,000    
Expenses From Structural Damages Net Of Insurance Receivables 6,500    
Adjustments To Indemnity Reserves On Loans Sold (3,436)    
Hurricanes | Covered loans      
Hurricanes Impact [Line Items]      
Provision for Loan and Lease Losses 5,800    
Hurricanes | Non Covered Loans      
Hurricanes Impact [Line Items]      
Allowance for loan losses 117,600    
Hurricanes | Maximum      
Hurricanes Impact [Line Items]      
Estimated Loan Losses Range 160,000    
Hurricanes | Minimum      
Hurricanes Impact [Line Items]      
Estimated Loan Losses Range 70,000    
Hurricanes | ASC Subtopic 310-30      
Hurricanes Impact [Line Items]      
Provision for Loan and Lease Losses $ 5,600