LOAN PORTFOLIO - Corporation's TDR Activity (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Schedule Of Financing Receivables [Line Items]
Beginning Balance of TDRs	$ 630,258	[1]	$ 941,730
New TDRs	164,108		124,424
Increases to existing TDRs (disbursements)	1,903		2,864
Charge-offs post modification	(43,916)		(132,595)
Financing Receivable Modifications Sold	(4,500)		(104,915)
Foreclosures	(4,948)		(11,886)
Removed from TDR classification	0		(6,764)
TDRs transferred to loans held for sale	0		(129,964)
Paid-off and partial payments	(48,452)		(52,636)
Ending balance of TDRs	$ 694,453	[2]	$ 630,258	[1]

[1] Excludes TDRs held for sale amounting to $45.9 million as of December 31, 2013.

[2] Excludes TDR held for sale amounting to $45.7 million as of December 31, 2014.