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LOAN PORTFOLIO - Corporation's TDR Activity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Schedule Of Financing Receivables [Line Items]        
Beginning Balance of TDRs $ 557,196 $ 568,543 $ 587,219 $ 647,048
New TDRs 107,357 29,101 164,004 83,368
Increases to existing TDRs (disbursements) 78 2,650 6,924 3,404
Charge-offs post modification (7,549) (2,949) (25,336) [1] (26,976)
Sales 0 0 0 (53,245)
Foreclosures (4,898) (3,564) (15,700) (24,085)
TDRs transferred to loans held for sale (4,541) 0 (34,541) 0
Paid-off and partial payments (21,923) (7,986) (56,850) (43,719)
Ending balance of TDRs $ 625,720 $ 585,795 $ 625,720 $ 585,795
[1]
The quarter ended September 30, 2018 includes charge-offs of $3.4 million associated with $4.5 million in commercial loans transferred to held for sale.