LOAN PORTFOLIO - Loan Restructuring and Effect on Allowance for Loan and Lease Losses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 705,123	[1]	$ 622,320	$ 694,453	[2]
Charges to the provision for loan losses	32,970		31,915
Allowance for loan losses at the end of the period	226,064			222,395
Loans Split [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	42,907		78,833
Amount charged-off	0		0
Charges to the provision for loan losses	(24)		(15)
Allowance for loan losses at the end of the period	707		1,547
Accrual [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 434,199			$ 494,640

[1] Excludes TDRs held for sale amounting to $45.7 million as of March 31, 2015.

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