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LOAN PORTFOLIO- Selected Information on TDRs includes Recorded Investment by Loan Class and Modification Type (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment $ 587,219 $ 647,048 $ 661,591 $ 694,453
Non-FHA/VA Residential Mortgage loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 363,930 375,809 382,672  
Commercial Mortgage Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 50,812 48,742 44,498  
Commercial And Industrial Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 94,112 133,521 150,254  
Construction Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 41,800      
Auto loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 22,605 24,875 21,582  
Finance Leases [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 2,184 2,647 2,077  
Other Consumer Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 11,783 14,842 14,794  
Land Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 6,476 9,362 2,766  
Residential Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 217 357 3,482  
Commercial Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 35,100 36,893 39,466  
Troubled Debt Restructurings Interest Rate Below Market [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 35,947 37,645 35,697  
Troubled Debt Restructurings Interest Rate Below Market [Member] | Non-FHA/VA Residential Mortgage loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 25,964 29,254 29,066  
Troubled Debt Restructurings Interest Rate Below Market [Member] | Commercial Mortgage Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 6,563 6,044 4,379  
Troubled Debt Restructurings Interest Rate Below Market [Member] | Commercial And Industrial Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 2,510 2,111 2,163  
Troubled Debt Restructurings Interest Rate Below Market [Member] | Auto loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 0 0  
Troubled Debt Restructurings Interest Rate Below Market [Member] | Finance Leases [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 0 0  
Troubled Debt Restructurings Interest Rate Below Market [Member] | Other Consumer Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 892 236 89  
Troubled Debt Restructurings Interest Rate Below Market [Member] | Land Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 18 0 0  
Troubled Debt Restructurings Interest Rate Below Market [Member] | Residential Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 0 0  
Troubled Debt Restructurings Interest Rate Below Market [Member] | Commercial Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 0 0  
Troubled Debt Restructurings Maturity Or Term Extension [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 38,683 88,535 87,159  
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Non-FHA/VA Residential Mortgage loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 8,318 8,373 6,027  
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Commercial Mortgage Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 2,094 2,007 1,244  
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Commercial And Industrial Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 20,648 66,830 75,104  
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Auto loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1,347 1,706 2,330  
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Finance Leases [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 238 366 621  
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Other Consumer Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 2,097 2,518 1,604  
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Land Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 3,941 6,735 229  
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Residential Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 0 0  
Troubled Debt Restructurings Maturity Or Term Extension [Member] | Commercial Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 0 0  
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 340,753 355,812 380,714  
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Non-FHA/VA Residential Mortgage loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 267,578 280,588 297,310  
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Commercial Mortgage Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 31,870 30,005 26,109  
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Commercial And Industrial Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 16,049 16,359 27,214  
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Auto loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 14,233 14,698 12,388  
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Finance Leases [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1,946 2,281 1,456  
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Other Consumer Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 6,891 9,662 11,026  
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Land Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 2,186 2,219 2,165  
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Residential Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 0 3,046  
Troubled Debt Restructurings Combination Of Reduction In Interest Rate And Extension Of Maturity [Member] | Commercial Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 0 0  
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 35,317 38,055 42,820  
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Non-FHA/VA Residential Mortgage loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 0 0  
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Commercial Mortgage Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 0 0  
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Commercial And Industrial Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 863 3,027  
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Auto loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 0 0  
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Finance Leases [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 0 0  
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Other Consumer Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 217 299 327  
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Land Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 0 0  
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Residential Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 0 0  
Troubled Debt Restructurings Forgiveness Of Principal And Interest [Member] | Commercial Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 35,100 36,893 39,466  
Forbearance Agreements [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 6,623      
Forbearance Agreements [Member] | Non-FHA/VA Residential Mortgage loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Forbearance Agreements [Member] | Commercial Mortgage Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Forbearance Agreements [Member] | Commercial And Industrial Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 6,623      
Forbearance Agreements [Member] | Auto loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Forbearance Agreements [Member] | Finance Leases [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Forbearance Agreements [Member] | Other Consumer Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Forbearance Agreements [Member] | Land Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Forbearance Agreements [Member] | Residential Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Forbearance Agreements [Member] | Commercial Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Troubled Debt Restructurings Other [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 129,896 [1] 127,001 [2] 115,201 [3]  
Troubled Debt Restructurings Other [Member] | Non-FHA/VA Residential Mortgage loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 62,070 [1] 57,594 [2] 50,269 [3]  
Troubled Debt Restructurings Other [Member] | Commercial Mortgage Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 10,285 [1] 10,686 [2] 12,766 [3]  
Troubled Debt Restructurings Other [Member] | Commercial And Industrial Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 48,282 [1] 47,358 [2] 42,746 [3]  
Troubled Debt Restructurings Other [Member] | Auto loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 7,025 [1] 8,471 [2] 6,864 [3]  
Troubled Debt Restructurings Other [Member] | Finance Leases [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 [1] 0 [2] 0 [3]  
Troubled Debt Restructurings Other [Member] | Other Consumer Loans [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1,686 [1] 2,127 [2] 1,748 [3]  
Troubled Debt Restructurings Other [Member] | Land Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 331 [1] 408 [2] 372 [3]  
Troubled Debt Restructurings Other [Member] | Residential Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment 217 [1] 357 [2] 436 [3]  
Troubled Debt Restructurings Other [Member] | Commercial Construction [Member]        
Financing Receivable Impaired [Line Items]        
Financing Receivable, Modifications, Recorded Investment $ 0 [1] $ 0 [2] $ 0  
[1]
Other concessions granted by the Corporation include 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 include 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.
[3]
Other concessions granted by the Corporation include 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.