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LOAN PORTFOLIO- Corporation's Aging of Purchased Credit Impaired Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due $ 507,033   $ 574,654      
Financing Receivable, Current 8,465,216   8,136,829      
Loans and Leases Receivable, Gross 9,113,955   8,858,123 $ 8,640,291    
Residential Portfolio Segment [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Loans and Leases Receivable, Gross 3,070,746   3,163,208 3,238,001    
Commercial Portfolio Segment [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Loans and Leases Receivable, Gross 3,930,293   3,750,202      
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 82,572   111,520      
Financing Receivable, Current 1,464,453   1,407,678      
Loans and Leases Receivable, Gross 1,550,364   1,522,662 1,533,308    
PCI loans            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 34,773   36,423      
Financing Receivable, Current 106,933   110,217      
Loans and Leases Receivable, Gross 141,706 $ 144,443 146,640 152,242 $ 155,281 $ 158,174
PCI loans | Residential Portfolio Segment [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 32,376   33,911      
Financing Receivable, Current 105,991   109,265      
Loans and Leases Receivable, Gross 138,367   143,176 148,025    
PCI loans | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 2,397   2,512      
Financing Receivable, Current 942   952      
Loans and Leases Receivable, Gross 3,339   3,464 $ 4,217    
30-59 Days Past Due [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 48,860   49,020      
30-59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 0   0      
Loans and Leases Receivable, Gross 19,400   5,100      
30-59 Days Past Due [Member] | PCI loans            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 0   0      
30-59 Days Past Due [Member] | PCI loans | Residential Portfolio Segment [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 0   0      
Loans and Leases Receivable, Gross 13,700   11,600      
30-59 Days Past Due [Member] | PCI loans | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 0   0      
Loans and Leases Receivable, Gross 100          
60-89 Days Past Due [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 90,324   80,578      
60-89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 1,473   1,038      
60-89 Days Past Due [Member] | PCI loans            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 7,750   6,979      
60-89 Days Past Due [Member] | PCI loans | Residential Portfolio Segment [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 7,750   6,979      
60-89 Days Past Due [Member] | PCI loans | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 0   0      
90 days or more Past Due [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 367,849   445,056      
90 days or more Past Due [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 81,099   110,482      
90 days or more Past Due [Member] | PCI loans            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 27,023   29,444      
90 days or more Past Due [Member] | PCI loans | Residential Portfolio Segment [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due 24,626   26,932      
90 days or more Past Due [Member] | PCI loans | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]            
Accounts Notes And Loans Receivable [Line Items]            
Total Past Due $ 2,397   $ 2,512