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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance $ 183,732 $ 225,856 $ 196,362 $ 231,843        
Charge-offs (27,913) (27,696) (56,273) (57,056)        
Recoveries 3,658 4,339 7,568 7,168        
Charges to the provision for loan losses 12,534 19,536 24,354 40,080        
Ending balance 172,011 222,035 172,011 222,035        
Ending balance: specific reserve for impaired loans 36,835 49,514 36,835 49,514   $ 53,976    
Ending balance 9,113,955 8,640,291 9,113,955 8,640,291        
Ending balance: impaired loans 711,828 740,134 711,828 740,134 $ 732,871 760,269 $ 746,280 $ 790,308
General Allowance [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance     131,032          
Ending balance 123,742 161,167 123,742 161,167        
Ending balance 8,260,421 7,747,915 8,260,421 7,747,915        
PCI loans                
Financing Receivable Allowance For Credit Losses [Line Items]                
Ending balance: purchased credit impaired loans 11,434 11,354 11,434 11,354 $ 11,354 11,354 $ 11,251 $ 11,251
Ending balance 141,706 152,242 141,706 152,242        
Residential Portfolio Segment [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance 51,886 56,386 50,794 58,975        
Charge-offs (4,768) (5,544) (10,941) (8,915)        
Recoveries 580 689 1,206 1,024        
Charges to the provision for loan losses 586 3,599 7,225 4,046        
Ending balance 48,284 55,130 48,284 55,130        
Ending balance: specific reserve for impaired loans 18,788 19,804 18,788 19,804   19,965    
Ending balance 3,070,746 3,238,001 3,070,746 3,238,001        
Ending balance: impaired loans 391,016 409,085 391,016 409,085        
Residential Portfolio Segment [Member] | General Allowance [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance     19,875          
Ending balance 18,433 24,372 18,433 24,372        
Ending balance 2,541,363 2,680,891 2,541,363 2,680,891        
Residential Portfolio Segment [Member] | PCI loans                
Financing Receivable Allowance For Credit Losses [Line Items]                
Ending balance: purchased credit impaired loans 11,063 10,954 11,063 10,954   10,954    
Ending balance 138,367 148,025 138,367 148,025        
Commercial Portfolio Segment [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Ending balance 3,930,293   3,930,293          
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance 53,430 50,393 55,581 48,493        
Charge-offs (11,688) (3,897) (14,088) (10,707)        
Recoveries 90 38 218 87        
Charges to the provision for loan losses 4,541 2,184 4,662 10,845        
Ending balance 46,373 48,718 46,373 48,718        
Ending balance: specific reserve for impaired loans 9,023 12,204 9,023 12,204   17,684    
Ending balance 1,550,364 1,533,308 1,550,364 1,533,308        
Ending balance: impaired loans 207,509 175,575 207,509 175,575   227,426    
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | General Allowance [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance     37,497          
Ending balance 36,979 36,114 36,979 36,114        
Ending balance 1,339,516 1,353,516 1,339,516 1,353,516        
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | PCI loans                
Financing Receivable Allowance For Credit Losses [Line Items]                
Ending balance: purchased credit impaired loans 371 400 371 400   400    
Ending balance 3,339 4,217 3,339 4,217        
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance 22,321 47,659 32,546 48,871        
Charge-offs (358) (5,110) (6,669) (7,040)        
Recoveries 275 1,376 1,370 1,438        
Charges to the provision for loan losses (594) 75 (5,603) 731        
Ending balance 21,644 44,000 21,644 44,000        
Ending balance: specific reserve for impaired loans 3,880 10,592 3,880 10,592   9,693    
Ending balance 2,279,685 2,009,049 2,279,685 2,009,049        
Ending balance: impaired loans 80,137 111,371 80,137 111,371   91,192    
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | General Allowance [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance     22,853          
Ending balance 17,764 33,408 17,764 33,408        
Ending balance 2,199,548 1,897,678 2,199,548 1,897,678        
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        
Consumer Portfolio Segment [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance 52,764 67,296 53,849 70,982        
Charge-offs (11,027) (12,327) (24,296) (24,399)        
Recoveries 2,404 2,098 4,424 4,468        
Charges to the provision for loan losses 8,543 13,171 18,707 19,187        
Ending balance 52,684 70,238 52,684 70,238        
Ending balance: specific reserve for impaired loans 4,570 5,853 4,570 5,853   5,874    
Ending balance 2,112,916 1,775,250 2,112,916 1,775,250        
Ending balance: impaired loans 27,137 32,842 27,137 32,842        
Consumer Portfolio Segment [Member] | General Allowance [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance     47,975          
Ending balance 48,114 64,385 48,114 64,385        
Ending balance 2,085,779 1,742,408 2,085,779 1,742,408        
Consumer Portfolio Segment [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        
Construction Loans [Member] | Commercial Portfolio Segment [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance 3,331 4,122 3,592 4,522        
Charge-offs (72) (818) (279) (5,995)        
Recoveries 309 138 350 151        
Charges to the provision for loan losses (542) 507 (637) 5,271        
Ending balance 3,026 3,949 3,026 3,949        
Ending balance: specific reserve for impaired loans 574 1,061 574 1,061   760    
Ending balance 100,244 84,683 100,244 84,683        
Ending balance: impaired loans 6,029 11,261 6,029 11,261        
Construction Loans [Member] | Commercial Portfolio Segment [Member] | General Allowance [Member]                
Financing Receivable Allowance For Credit Losses [Line Items]                
Beginning balance     2,832          
Ending balance 2,452 2,888 2,452 2,888        
Ending balance 94,215 73,422 94,215 73,422        
Construction Loans [Member] | Commercial Portfolio Segment [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