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, 2018		Mar. 31, 2017		Dec. 31, 2017
Accretable yield
Beginning Balance		$ 880,715		$ 1,010,087
Accretion		(35,008)		(36,892)
Change In Expected Cash Flows		28,668		8,011
Ending Balance		874,375		981,206
Carrying amount of loans
Beginning Balance		1,592,921	[1]	1,738,329	[2]
Accretion		35,008		36,892
Collections		(52,786)		(86,321)
Ending Balance	[1],[2]	1,575,143		1,688,900
Less: Allowance for loan losses		(89,763)		(66,544)		$ (70,129)
Carrying amount, net of allowance		1,485,380		1,622,356		1,522,792
Non-credit Impaired Loans
Accretable yield
Beginning Balance		875,837		1,001,908
Accretion		(34,349)		(36,016)
Change In Expected Cash Flows		28,798		7,789
Ending Balance		870,286		973,681
Carrying amount of loans
Beginning Balance		1,556,601	[1]	1,695,381	[2]
Accretion		34,349		36,016
Collections		(51,883)		(83,069)
Ending Balance	[1],[2]	1,539,067		1,648,328
Less: Allowance for loan losses		(84,801)		(59,283)		(64,520)
Carrying amount, net of allowance		1,454,266		1,589,045		1,492,081
Credit Impaired Loans
Accretable yield
Beginning Balance		4,878		8,179
Accretion		(659)		(876)
Change In Expected Cash Flows		(130)		222
Ending Balance		4,089		7,525
Carrying amount of loans
Beginning Balance		36,320	[1]	42,948	[2]
Accretion		659		876
Collections		(903)		(3,252)
Ending Balance	[1],[2]	36,076		40,572
Less: Allowance for loan losses		(4,962)		(7,261)		(5,609)
Carrying amount, net of allowance		$ 31,114		$ 33,311		$ 30,711

[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 $505 million as of March 31, 2018 and $563 million as of December 31, 2016.

[2] 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 $ 505 million as of March 31, 2018 (March 31, 2017- $542 million).