SEGMENT INFORMATION - revenues and selected balance sheet data by geography based on the location (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 707,277	$ 650,810	$ 673,246
Total assets	12,243,561	12,261,268
Total gross loans held for investment portfolio	8,858,123	8,850,476	8,886,873
Deposits	8,994,714	9,022,631
Brokered certificates of deposit	555,597	1,150,485
Puerto Rico [Member]
Segment Reporting Information [Line Items]
Total revenues	581,269	536,069	568,180
Total assets	9,797,267	9,871,272	9,765,530
Total gross loans held for investment portfolio	6,586,033	6,633,432	6,926,719
Deposits	6,208,531	6,268,056	6,291,353
Brokered certificates of deposit	441,100	1,000,000	1,400,000
United States [Member]
Segment Reporting Information [Line Items]
Total revenues	86,991	72,424	60,607
Total assets	1,940,633	1,780,654	1,499,548
Total gross loans held for investment portfolio	1,834,088	1,665,448	1,382,440
Deposits	1,519,362	1,637,941	1,564,839
Brokered certificates of deposit	114,500	158,000	60,100
Virgin Islands [Member]
Segment Reporting Information [Line Items]
Total revenues	39,017	42,317	44,459
Total assets	505,661	609,342	657,377
Total gross loans held for investment portfolio	481,188	584,576	627,720
Deposits	$ 1,266,821	$ 1,116,634	$ 975,013