Activity in Allowance for Loan Losses Related to ASC 310-30 Acquired Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Covered Under Loss Sharing Agreements With F D I C [Member]	Dec. 31, 2013 Covered Under Loss Sharing Agreements With F D I C [Member]	Jun. 30, 2014 Westernbank Puerto Rico [Member] Acquired Loans In An F D I C Assisted Transaction [Member] Nonperforming Financing Receivable Member	Jun. 30, 2013 Westernbank Puerto Rico [Member] Acquired Loans In An F D I C Assisted Transaction [Member] Nonperforming Financing Receivable Member	Jun. 30, 2014 Westernbank Puerto Rico [Member] Acquired Loans In An F D I C Assisted Transaction [Member] Nonperforming Financing Receivable Member	Jun. 30, 2013 Westernbank Puerto Rico [Member] Acquired Loans In An F D I C Assisted Transaction [Member] Nonperforming Financing Receivable Member
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	$ 640,348	$ 683,368	$ 640,555	$ 730,607	$ 98,665	$ 102,092	$ 90,371	$ 91,573	$ 93,915	$ 95,407
Provision for loan losses	61,678	249,408	134,750	473,264			10,951	17,568	35,506	31,608
Charge-offs	(83,975)	(132,181)	(196,748)	(270,566)			(10,430)	(17,946)	(38,529)	(35,820)
Recoveries	27,062	34,126	66,556	64,559
Net write-down related to loans sold	0	(199,502)	0	(362,645)
Balance at end of period	$ 624,911	$ 635,219	$ 624,911	$ 635,219	$ 98,665	$ 102,092	$ 90,892	$ 91,195	$ 90,892	$ 91,195