Note Loans (Carrying amount of Westernbank loans accounted for pursuant to ASC310-30) (Detail) - Westernbank Puerto Rico - Acquired loans in an FDIC assisted transaction - ASC Subtopic 310-30 - USD ($) $ in Thousands	Jun. 30, 2017		Mar. 31, 2017	[3]	Dec. 31, 2016		Jun. 30, 2016		Mar. 31, 2016	[1],[2]	Dec. 31, 2015	[2],[3]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 1,617,787	[1],[2],[3]	$ 1,688,900		$ 1,738,329	[2],[3]	$ 1,799,943	[1],[2]	$ 1,935,441		$ 1,974,501
Less: Allowance for loan losses	(65,674)				(68,877)		(66,995)
Carrying amount, net of allowance	1,552,113				1,669,452		1,732,948
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	923,687				999,621
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	96,795				103,476
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	170				1,668
Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	578,593				613,730
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	18,542				19,834
Non-credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	1,579,196	[1],[2],[3]	1,648,328		1,695,381	[2],[3]	1,754,613	[1],[2]	1,865,940		1,898,146
Less: Allowance for loan losses	(59,165)				(61,855)		(57,895)
Carrying amount, net of allowance	1,520,031				1,633,526		1,696,718
Non-credit Impaired Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	908,923				985,181
Non-credit Impaired Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	96,795				103,476
Non-credit Impaired Loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	0				0
Non-credit Impaired Loans | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	555,771				587,949
Non-credit Impaired Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	17,707				18,775
Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	38,591	[1],[2],[3]	$ 40,572		42,948	[2],[3]	45,330	[1],[2]	$ 69,501		$ 76,355
Less: Allowance for loan losses	(6,509)				(7,022)		(9,100)
Carrying amount, net of allowance	32,082				35,926		$ 36,230
Credit Impaired Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	14,764				14,440
Credit Impaired Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	0				0
Credit Impaired Loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	170				1,668
Credit Impaired Loans | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	22,822				25,781
Credit Impaired Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 835				$ 1,059

[1] 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 $ 526 million as of June 30, 2017 (June 30, 2016- $597 million).

[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 $526 million as of June 30, 2017 (June 30, 2016- $597 million).

[3] 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 $526 million as of June 30, 2017 and $563 million as of December 31, 2016.