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ALLOWANCE FOR LOAN AND LEASE LOSSES - Carrying Amount of Portfolios (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable With No Related Allowance Recorded Investment $ 179,924 $ 188,397    
Impaired Financing Receivable With Related Allowance Recorded Investment 552,947 571,872    
Impaired Financing Receivable Related Allowance 50,554 53,976 $ 56,930  
Loans and Leases Receivable, Gross 8,996,816 8,858,123 8,695,890  
Loans and Leases Receivable, Allowance $ 183,732 $ 196,362 225,856 $ 231,843
Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 9.14% 9.44%    
Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 2.04% 2.22%    
PCI loans        
Financing Receivable Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross $ 144,443 $ 146,640 155,281 158,174
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses $ 11,354 $ 11,354 11,251 11,251
PCI loans | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 7.86% 7.74%    
General Allowance [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross $ 8,119,502 $ 7,951,214 7,794,329  
Loans and Leases Receivable, Allowance $ 121,824 $ 131,032 157,675  
General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 1.50% 1.65%    
Residential mortgage loans [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable With No Related Allowance Recorded Investment $ 94,516 $ 110,238    
Impaired Financing Receivable With Related Allowance Recorded Investment 299,219 293,494    
Impaired Financing Receivable Related Allowance 20,753 19,965 22,546  
Loans and Leases Receivable, Gross 3,126,562 3,163,208 3,267,868  
Loans and Leases Receivable, Allowance $ 51,886 $ 50,794 56,386 58,975
Residential mortgage loans [Member] | Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 6.94% 6.80%    
Residential mortgage loans [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 1.66% 1.61%    
Residential mortgage loans [Member] | PCI loans        
Financing Receivable Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross $ 140,979 $ 143,176 151,067  
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses $ 10,954 $ 10,954 10,873  
Residential mortgage loans [Member] | PCI loans | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 7.77% 7.65%    
Residential mortgage loans [Member] | General Allowance [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross $ 2,591,848 $ 2,616,300 2,699,191  
Loans and Leases Receivable, Allowance $ 20,179 $ 19,875 22,967  
Residential mortgage loans [Member] | General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 0.78% 0.76%    
Commercial Portfolio Segment [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross $ 3,854,962 $ 3,750,202    
Commercial Portfolio Segment [Member] | Construction Loans [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable With No Related Allowance Recorded Investment 3,315 2,431    
Impaired Financing Receivable With Related Allowance Recorded Investment 2,865 4,162    
Impaired Financing Receivable Related Allowance 596 760 1,484  
Loans and Leases Receivable, Gross 84,507 79,429 79,150  
Loans and Leases Receivable, Allowance $ 3,331 $ 3,592 4,122 4,522
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 20.80% 18.26%    
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 3.94% 4.52%    
Commercial Portfolio Segment [Member] | Construction Loans [Member] | PCI loans        
Financing Receivable Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross $ 0 $ 0 0  
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses 0 0 0  
Commercial Portfolio Segment [Member] | Construction Loans [Member] | General Allowance [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 78,327 72,836 67,083  
Loans and Leases Receivable, Allowance $ 2,735 $ 2,832 2,638  
Commercial Portfolio Segment [Member] | Construction Loans [Member] | General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 3.49% 3.89%    
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable With No Related Allowance Recorded Investment $ 30,264 $ 30,030    
Impaired Financing Receivable With Related Allowance Recorded Investment 52,083 61,162    
Impaired Financing Receivable Related Allowance 4,112 9,693 14,375  
Loans and Leases Receivable, Gross 2,211,731 2,148,111 2,061,773  
Loans and Leases Receivable, Allowance $ 22,321 $ 32,546 47,659 48,871
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 7.90% 15.85%    
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 1.01% 1.52%    
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | PCI loans        
Financing Receivable Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross $ 0 $ 0 0  
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses 0 0 0  
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | General Allowance [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 2,129,384 2,056,919 1,941,995  
Loans and Leases Receivable, Allowance $ 18,209 $ 22,853 33,284  
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 0.86% 1.11%    
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable With No Related Allowance Recorded Investment $ 49,549 $ 43,358    
Impaired Financing Receivable With Related Allowance Recorded Investment 172,632 184,068    
Impaired Financing Receivable Related Allowance 20,314 17,684 13,451  
Loans and Leases Receivable, Gross 1,558,724 1,522,662 1,552,503  
Loans and Leases Receivable, Allowance $ 53,430 $ 55,581 50,393 48,493
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 11.77% 9.61%    
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 3.43% 3.65%    
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | PCI loans        
Financing Receivable Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross $ 3,464 $ 3,464 4,214  
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses $ 400 $ 400 378  
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | PCI loans | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 11.55% 11.55%    
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | General Allowance [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross $ 1,333,079 $ 1,291,772 1,386,163  
Loans and Leases Receivable, Allowance $ 32,716 $ 37,497 36,564  
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 2.45% 2.90%    
Consumer Portfolio Segment [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable With No Related Allowance Recorded Investment $ 2,280 $ 2,340    
Impaired Financing Receivable With Related Allowance Recorded Investment 26,148 28,986    
Impaired Financing Receivable Related Allowance 4,779 5,874 5,074  
Loans and Leases Receivable, Gross 2,015,292 1,944,713 1,734,596  
Loans and Leases Receivable, Allowance $ 52,764 $ 53,849 67,296 $ 70,982
Consumer Portfolio Segment [Member] | Allowance for loan and lease losses, numerator [Member] | Impaired principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 18.28% 20.26%    
Consumer Portfolio Segment [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 2.62% 2.77%    
Consumer Portfolio Segment [Member] | PCI loans        
Financing Receivable Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross $ 0 $ 0 0  
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Allowance For Loan Losses 0 0 0  
Consumer Portfolio Segment [Member] | General Allowance [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 1,986,864 1,913,387 1,699,897  
Loans and Leases Receivable, Allowance $ 47,985 $ 47,975 $ 62,222  
Consumer Portfolio Segment [Member] | General Allowance [Member] | Allowance for loan and lease losses, numerator [Member] | Principal balance, denominator [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Allowance for loan and lease losses to principal balance 2.42% 2.51%