Note Loans (Changes in the carrying amount and the accretable yield for the acquired loans in the Westernbank FDIC-assisted transaction) (Detail) - Westernbank Puerto Rico - Acquired loans in an FDIC assisted transaction - ASC Subtopic 310-30 - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016		Mar. 31, 2015	Dec. 31, 2015
Accretable yield
Beginning Balance	$ 1,112,458		$ 1,271,337
Accretion	(43,533)		(55,697)
Change In Expected Cash Flows	59,883		43,308
Ending Balance	1,128,808		1,258,948
Carrying amount of loans
Beginning Balance	1,974,501	[1]	2,444,172
Accretion	43,533		55,697
Collections	(82,593)		(132,773)
Ending Balance	1,935,441	[1]	2,367,096
Less: Allowance for loan losses	(62,967)		(68,386)	$ (63,563)
Carrying amount, net of allowance	1,872,474		2,298,710	1,910,938
Non-credit Impaired Loans
Accretable yield
Beginning Balance	1,105,732		1,265,752
Accretion	(42,000)		(53,776)
Change In Expected Cash Flows	54,544		42,273
Ending Balance	1,118,276		1,254,249
Carrying amount of loans
Beginning Balance	1,898,146	[1]	2,272,142
Accretion	42,000		53,776
Collections	(74,206)		(114,137)
Ending Balance	1,865,940	[1]	2,211,781
Less: Allowance for loan losses	(58,703)		(49,750)	(59,753)
Carrying amount, net of allowance	1,807,237		2,162,031	1,838,393
Credit Impaired Loans
Accretable yield
Beginning Balance	6,726		5,585
Accretion	(1,533)		(1,921)
Change In Expected Cash Flows	5,339		1,035
Ending Balance	10,532		4,699
Carrying amount of loans
Beginning Balance	76,355	[1]	172,030
Accretion	1,533		1,921
Collections	(8,387)		(18,636)
Ending Balance	69,501	[1]	155,315
Less: Allowance for loan losses	(4,264)		(18,636)	(3,810)
Carrying amount, net of allowance	$ 65,237		$ 136,679	$ 72,545

[1] The carrying amount of loans acquired from Westernbank and accounted for under ASC 310-30 which remains subject to the loss sharing agreement with the FDIC amounted to approximately $615 million as of March 31, 2016 and $636 million as of December 31, 2015.