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ALLOWANCE FOR LOAN AND LEASE LOSSES - Changes in Allowance for Loan and Lease Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance $ 222,035 $ 173,485 $ 231,843 $ 205,603        
Charge-offs (36,312) (19,369) (93,368) (107,751)        
Recoveries 3,316 1,741 10,484 14,467        
Provision 11,524 75,013 51,604 118,551        
Ending balance 200,563 230,870 200,563 230,870        
Ending balance: specific reserve for impaired loans 53,313 48,155 53,313 48,155 $ 49,514 $ 51,410 $ 40,794 $ 64,421
Ending balance: purchased credit impaired loans 11,354 10,235 11,354 10,235 11,354 11,251 9,446 6,857
Ending balance 8,716,953 8,877,214 8,716,953 8,877,214   8,850,476    
Ending balance: impaired loans 788,010 779,259 788,010 779,259 $ 740,134 790,308 $ 735,625 $ 887,905
General Allowance [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance     169,182          
Ending balance 135,896 172,480 135,896 172,480        
Ending balance 7,779,821 7,940,161 7,779,821 7,940,161   7,901,994    
PCI loans                
Financing Receivable Allowance For Credit Losses [Line Items]                
Ending balance: purchased credit impaired loans 11,354 10,235 11,354 10,235   11,251    
Ending balance 149,122 157,794 149,122 157,794   158,174    
Residential Portfolio Segment [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance 55,130 40,587 58,975 33,980        
Charge-offs (8,316) (7,177) (17,231) (22,369)        
Recoveries 833 321 1,857 1,961        
Provision 360 23,321 4,406 43,480        
Ending balance 48,007 57,052 48,007 57,052        
Ending balance: specific reserve for impaired loans 18,482 19,417 18,482 19,417   22,086    
Ending balance 3,207,981 3,274,340 3,207,981 3,274,340   3,290,957    
Ending balance: impaired loans 408,794 425,835 408,794 425,835        
Residential Portfolio Segment [Member] | General Allowance [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance     26,016          
Ending balance 18,571 27,772 18,571 27,772        
Ending balance 2,653,984 2,694,896 2,653,984 2,694,896   2,703,532    
Residential Portfolio Segment [Member] | PCI loans                
Financing Receivable Allowance For Credit Losses [Line Items]                
Ending balance: purchased credit impaired loans 10,954 9,863 10,954 9,863   10,873    
Ending balance 145,203 153,609 145,203 153,609   153,991    
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance 48,718 38,576 48,493 57,261        
Charge-offs (9,850) (266) (20,557) (32,123)        
Recoveries 291 43 378 151        
Provision 10,111 17,590 20,956 30,654        
Ending balance 49,270 55,943 49,270 55,943        
Ending balance: specific reserve for impaired loans 17,044 10,456 17,044 10,456   9,783    
Ending balance 1,506,502 1,601,638 1,506,502 1,601,638   1,614,972    
Ending balance: impaired loans 243,220 153,875 243,220 153,875   152,914    
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | General Allowance [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance     38,332          
Ending balance 31,826 45,115 31,826 45,115        
Ending balance 1,259,363 1,443,578 1,259,363 1,443,578   1,457,875    
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | PCI loans                
Financing Receivable Allowance For Credit Losses [Line Items]                
Ending balance: purchased credit impaired loans 400 372 400 372   378    
Ending balance 3,919 4,185 3,919 4,185   4,183    
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance 44,000 42,082 48,871 61,953        
Charge-offs (2,242) (738) (9,282) (19,168)        
Recoveries 127 114 1,565 5,613        
Provision 2,281 (1,079) 3,012 (8,019)        
Ending balance 44,166 40,379 44,166 40,379        
Ending balance: specific reserve for impaired loans 10,798 11,240 10,798 11,240   12,359    
Ending balance 2,068,256 2,144,236 2,068,256 2,144,236   2,083,253    
Ending balance: impaired loans 97,154 110,939 97,154 110,939   118,300    
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | General Allowance [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance     36,512          
Ending balance 33,368 29,139 33,368 29,139        
Ending balance 1,971,102 2,033,297 1,971,102 2,033,297   1,964,953    
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | PCI loans                
Financing Receivable Allowance For Credit Losses [Line Items]                
Ending balance: purchased credit impaired loans 0 0 0 0   0    
Ending balance 0 0 0 0   0    
Consumer Portfolio Segment [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance 70,238 48,504 70,982 49,847        
Charge-offs (13,712) (11,141) (38,111) (33,386)        
Recoveries 2,051 1,247 6,519 6,148        
Provision (2,536) 34,939 16,651 50,940        
Ending balance 56,041 73,549 56,041 73,549        
Ending balance: specific reserve for impaired loans 6,083 5,177 6,083 5,177        
Ending balance 1,851,352 1,727,540 1,851,352 1,727,540        
Ending balance: impaired loans 31,945 38,237 31,945 38,237        
Consumer Portfolio Segment [Member] | General Allowance [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Ending balance 49,958 68,372 49,958 68,372        
Ending balance 1,819,407 1,689,303 1,819,407 1,689,303        
Consumer Portfolio Segment [Member] | PCI loans                
Financing Receivable Allowance For Credit Losses [Line Items]                
Ending balance: purchased credit impaired loans 0 0 0 0        
Ending balance 0 0 0 0        
Construction Loans [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance 3,949 3,736 4,522 2,562        
Charge-offs (2,192) (47) (8,187) (705)        
Recoveries 14 16 165 594        
Provision 1,308 242 6,579 1,496        
Ending balance 3,079 3,947 3,079 3,947        
Ending balance: specific reserve for impaired loans 906 1,865 906 1,865   2,017    
Ending balance 82,862 129,460 82,862 129,460   111,397    
Ending balance: impaired loans 6,897 50,373 6,897 50,373        
Construction Loans [Member] | General Allowance [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance     2,505          
Ending balance 2,173 2,082 2,173 2,082        
Ending balance 75,965 79,087 75,965 79,087   64,131    
Construction Loans [Member] | PCI loans                
Financing Receivable Allowance For Credit Losses [Line Items]                
Ending balance: purchased credit impaired loans 0 0 0 0   0    
Ending balance 0 $ 0 0 $ 0   0    
Construction Loans [Member] | Residential Portfolio Segment [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Ending balance: specific reserve for impaired loans 156   156     55    
Ending balance: impaired loans 1,765   1,765     252    
Construction Loans [Member] | Commercial Portfolio Segment [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Ending balance: specific reserve for impaired loans 0   0     560    
Ending balance: impaired loans $ 0   $ 0     $ 35,101