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LOAN PORTFOLIO - Selected Information on TDRs Includes Recorded Investment by Loan Class and Modification Type (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment $ 625,720 $ 557,196 $ 587,219 $ 585,795 $ 568,543 $ 647,048
Interest Rate Below Market [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 30,456   35,947      
Maturity or Term Extension [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 68,786   38,683      
Combination of reduction in interest rate and extension of maturity [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 402,948   340,753      
Forgiveness of principal and/or interest [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 228   35,317      
Foberance Agrrements [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 4,383   6,623      
Other [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 118,919 [1]   129,896 [2]      
Non Fha Va Residential Mortgage Loans [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 340,269   363,930      
Non Fha Va Residential Mortgage Loans [Member] | Interest Rate Below Market [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 24,053   25,964      
Non Fha Va Residential Mortgage Loans [Member] | Maturity or Term Extension [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 11,496   8,318      
Non Fha Va Residential Mortgage Loans [Member] | Combination of reduction in interest rate and extension of maturity [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 245,022   267,578      
Non Fha Va Residential Mortgage Loans [Member] | Forgiveness of principal and/or interest [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Non Fha Va Residential Mortgage Loans [Member] | Foberance Agrrements [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 158   0      
Non Fha Va Residential Mortgage Loans [Member] | Other [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 59,540 [1]   62,070 [2]      
Commercial Mortgage Loans [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 169,205   50,812      
Commercial Mortgage Loans [Member] | Interest Rate Below Market [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 4,400   6,563      
Commercial Mortgage Loans [Member] | Maturity or Term Extension [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 30,980   2,094      
Commercial Mortgage Loans [Member] | Combination of reduction in interest rate and extension of maturity [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 124,493   31,870      
Commercial Mortgage Loans [Member] | Forgiveness of principal and/or interest [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Commercial Mortgage Loans [Member] | Foberance Agrrements [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Commercial Mortgage Loans [Member] | Other [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 9,332 [1]   10,285 [2]      
Commercial And Industrial Loan [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 79,711   94,112      
Commercial And Industrial Loan [Member] | Interest Rate Below Market [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 688   2,510      
Commercial And Industrial Loan [Member] | Maturity or Term Extension [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 19,963   20,648      
Commercial And Industrial Loan [Member] | Combination of reduction in interest rate and extension of maturity [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 13,323   16,049      
Commercial And Industrial Loan [Member] | Forgiveness of principal and/or interest [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Commercial And Industrial Loan [Member] | Foberance Agrrements [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 4,225   6,623      
Commercial And Industrial Loan [Member] | Other [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 41,512 [1]   48,282 [2]      
Land [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 2,475   6,476      
Land [Member] | Interest Rate Below Market [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 16   18      
Land [Member] | Maturity or Term Extension [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 104   3,941      
Land [Member] | Combination of reduction in interest rate and extension of maturity [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 2,016   2,186      
Land [Member] | Forgiveness of principal and/or interest [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Land [Member] | Foberance Agrrements [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Land [Member] | Other [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 339 [1]   331 [2]      
Construction-commercial [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 3,319   35,100      
Construction-commercial [Member] | Interest Rate Below Market [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Construction-commercial [Member] | Maturity or Term Extension [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 3,102   0      
Construction-commercial [Member] | Combination of reduction in interest rate and extension of maturity [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Construction-commercial [Member] | Forgiveness of principal and/or interest [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   35,100      
Construction-commercial [Member] | Foberance Agrrements [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Construction-commercial [Member] | Other [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 217 [1]   0 [2]      
Construction-residential [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   217      
Construction-residential [Member] | Interest Rate Below Market [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Construction-residential [Member] | Maturity or Term Extension [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Construction-residential [Member] | Combination of reduction in interest rate and extension of maturity [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Construction-residential [Member] | Forgiveness of principal and/or interest [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Construction-residential [Member] | Foberance Agrrements [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Construction-residential [Member] | Other [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0 [1]   217 [2]      
Construction Loans [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 5,800          
Consumer Auto Loans [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 18,892   22,605      
Consumer Auto Loans [Member] | Interest Rate Below Market [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Consumer Auto Loans [Member] | Maturity or Term Extension [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 1,627   1,347      
Consumer Auto Loans [Member] | Combination of reduction in interest rate and extension of maturity [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 11,066   14,233      
Consumer Auto Loans [Member] | Forgiveness of principal and/or interest [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Consumer Auto Loans [Member] | Foberance Agrrements [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Consumer Auto Loans [Member] | Other [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 6,199 [1]   7,025 [2]      
Finance Leases [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 1,372   2,184      
Finance Leases [Member] | Interest Rate Below Market [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Finance Leases [Member] | Maturity or Term Extension [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 116   238      
Finance Leases [Member] | Combination of reduction in interest rate and extension of maturity [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 1,256   1,946      
Finance Leases [Member] | Forgiveness of principal and/or interest [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Finance Leases [Member] | Foberance Agrrements [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Finance Leases [Member] | Other [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0 [1]   0 [2]      
Consumer Portfolio Segment [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 10,477   11,783      
Consumer Portfolio Segment [Member] | Interest Rate Below Market [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 1,299   892      
Consumer Portfolio Segment [Member] | Maturity or Term Extension [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 1,398   2,097      
Consumer Portfolio Segment [Member] | Combination of reduction in interest rate and extension of maturity [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 5,772   6,891      
Consumer Portfolio Segment [Member] | Forgiveness of principal and/or interest [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 228   217      
Consumer Portfolio Segment [Member] | Foberance Agrrements [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment 0   0      
Consumer Portfolio Segment [Member] | Other [Member]            
Financing Receivable Impaired [Line Items]            
Financing Receivable, Modifications, Recorded Investment $ 1,780 [1]   $ 1,686 [2]      
[1]
Other concessions granted by the Corporation included deferral of principal and/or interest payments for a period longer than what would be considered insignificant, payment plans under judicial stipulation, or a combination of the concessions listed in the table.
[2]
Other concessions granted by the Corporation included deferral of principal and/or interest payments for a period longer than what would be considered insignificant, payment plans under judicial stipulation or a combination of the concessions listed in the table.