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INVESTMENT SECURITIES - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended					12 Months Ended
		Jun. 30, 2017	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	May 17, 2017	Dec. 31, 2014
Schedule Of Investments [Line Items]
Proceeds from sale of available-for-sale securities							$ 23,408	$ 219,780	$ 0
Percentage Of Debt Securities Government And Government Sponsored Agencies							98.00%
Amortized cost of private label of mortgage backed security							$ 1,903,454
Maximum loan to value ratio							80.00%
Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities							$ 232,977	390,286	296,950
Fair Value							1,891,016	1,881,920
Amortized cost							$ 1,903,878	$ 1,908,557
Weighted average yield							2.27%	2.14%
Net gain on sale of investments							$ 371	$ 6,104	0
Interest Receivable							57,172	45,453
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net	[1]						$ 12,231	6,687	16,517
Percentage Of Held To Maturity Securities							70.00%
Percentage Of Stockholders Equity Exceeded By Securities Issuers							10.00%
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held					$ 22,294		$ 6,792	28,981	22,294		$ 5,777
Maximum [Member]
Schedule Of Investments [Line Items]
Recovery Rate			80.00%
Minimum [Member]
Schedule Of Investments [Line Items]
Recovery Rate			15.00%
Weighted Average [Member]
Schedule Of Investments [Line Items]
Recovery Rate			41.00%
U S Treasury Securities [Member]
Schedule Of Investments [Line Items]
Proceeds from sale of available-for-sale securities								15,000
Gain Loss On Sale Of Investments								8
Mortgage Backed Securities Issued By Private Enterprises [Member]
Schedule Of Investments [Line Items]
Proceeds from sale of available-for-sale securities								204,800
Gain Loss On Sale Of Investments								6,100
Puerto Rico Government obligations [Member]
Schedule Of Investments [Line Items]
Proceeds from sale of available-for-sale securities		$ 23,400					23,400
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net			$ 12,200	$ 6,300	$ 3,000	$ 12,900
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held										$ 34,400
Puerto Rico Government obligations [Member] | Puerto Rico Government Debt Securities Other Than Temporary Impairment [Member]
Schedule Of Investments [Line Items]
Amortized cost										$ 23,000
Default Rate			100.00%
Mortgage Backed Securities [Member]
Schedule Of Investments [Line Items]
Fair Value							1,274,497	1,348,725
Amortized cost							$ 1,281,690	$ 1,356,342
Weighted average yield							2.54%	2.49%
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net								$ 400	$ 600
Mortgage Backed Securities [Member] | Collateralized Mortgage Obligations [Member]
Schedule Of Investments [Line Items]
Fair Value							$ 44,061	58,812
Amortized cost							$ 43,805	$ 58,971
Weighted average yield							2.22%	1.43%
[1] For the years ended December 31, 2017, 2016 and 2015, approximately $12.2 million, $6.3 million and $15.9 million, respectively, of the credit impairment recognized in earnings consisted of credit losses on Puerto Rico government debt securities that were sold in the second quarter of 2017, as further discussed below. The remaining impairment losses for the years ended December 31, 2016 and 2015 were associated with credit losses on private label MBS.

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