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				9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016		Dec. 31, 2016
Accretable yield
Beginning Balance		$ 942,668		$ 1,071,680		$ 1,010,087		$ 1,112,458
Accretion		(34,790)		(39,590)		(108,170)		(131,599)
Change In Expected Cash Flows		1,451		6,602		7,412		57,833
Ending Balance		909,329		1,038,692		909,329		1,038,692
Carrying amount of loans
Beginning Balance		1,617,787	[1]	1,799,943	[2],[3]	1,738,329	[1],[2]	1,974,501	[1],[2]
Accretion		34,790		39,590		108,170		131,599
Collections		(64,030)		(71,994)		(257,952)		(338,561)
Ending Balance	[2],[3]	1,588,547	[1]	1,767,539		1,588,547	[1]	1,767,539
Less: Allowance for loan losses		(67,100)		(69,571)		(67,100)		(69,571)		$ (68,877)
Carrying amount, net of allowance		1,521,447		1,697,968		1,521,447		1,697,968		1,669,452
Non-credit Impaired Loans
Accretable yield
Beginning Balance		936,204		1,061,971		1,001,908		1,105,732
Accretion		(34,064)		(38,597)		(105,759)		(125,734)
Change In Expected Cash Flows		1,842		6,992		7,833		50,368
Ending Balance		903,982		1,030,366		903,982		1,030,366
Carrying amount of loans
Beginning Balance		1,579,196	[1]	1,754,613	[2],[3]	1,695,381	[1],[2]	1,898,146	[1],[2]
Accretion		34,064		38,597		105,759		125,734
Collections		(61,737)		(69,030)		(249,617)		(299,700)
Ending Balance	[2],[3]	1,551,523	[1]	1,724,180		1,551,523	[1]	1,724,180
Less: Allowance for loan losses		(61,034)		(62,114)		(61,034)		(62,114)		(61,855)
Carrying amount, net of allowance		1,490,489		1,662,066		1,490,489		1,662,066		1,633,526
Credit Impaired Loans
Accretable yield
Beginning Balance		6,464		9,709		8,179		6,726
Accretion		(726)		(993)		(2,411)		(5,865)
Change In Expected Cash Flows		(391)		(390)		(421)		7,465
Ending Balance		5,347		8,326		5,347		8,326
Carrying amount of loans
Beginning Balance		38,591	[1]	45,330	[2],[3]	42,948	[1],[2]	76,355	[1],[2]
Accretion		726		993		2,411		5,865
Collections		(2,293)		(2,964)		(8,335)		(38,861)
Ending Balance	[2],[3]	37,024	[1]	43,359		37,024	[1]	43,359
Less: Allowance for loan losses		(6,066)		(7,457)		(6,066)		(7,457)		(7,022)
Carrying amount, net of allowance		$ 30,958		$ 35,902		$ 30,958		$ 35,902		$ 35,926

[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 $515 million as of September 30, 2017 and $563 million as of December 31, 2016.

[2] For the nine months ended September 30, 2016, includes the impact of the bulk sale of loans with a carrying value of approximately $99 million.

[3] The carrying amount of loans acquired from Westernbank and accounted for under ASC 310-30 which remain subject to the loss sharing agreement with the FDIC amounted to approximately $ 515 million as of September 30, 2017 (September 30, 2016- $578 million).