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INVESTMENT SECURITIES - Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 2,066,355	$ 1,903,878
Noncredit Loss Component of OTTI Recorded in OCI	5,467	5,731
Gross Unrealized gain	4,868	11,309
Gross Unrealized loss	54,535	18,440
Investment securities available for sale	$ 2,011,221	$ 1,891,016
Weighted-average yield	2.51%	2.27%
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost		$ 424
Noncredit Loss Component of OTTI Recorded in OCI		0
Gross Unrealized gain		0
Gross Unrealized loss		6
Investment securities available for sale		$ 418
Weighted-average yield		2.11%
U S Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost Due within one year	$ 7,481
Noncredit Loss Component of OTTI Recorded in OCI Due within one year	0
Gross Unrealized gains Due within one year	0
Gross Unrealized losses Due within one year	55
Fair value Due within one year	$ 7,426
Weighted-average yield Due within one year	1.29%
Amortized cost After 1 to 5 years		$ 7,458
Noncredit Loss Component of OTTI Recorded in OCI After 1 to 5 years		0
Gross Unrealized gains After 1 to 5 years		0
Gross Unrealized losses After 1 to 5 years		57
Fair value After 1 to 5 years		$ 7,401
Weighted-average yield After 1 to 5 years		1.29%
U.S. government-sponsored agencies obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost Due within one year	$ 156,575	$ 122,471
Noncredit Loss Component of OTTI Recorded in OCI Due within one year	0	0
Gross Unrealized gains Due within one year	0	0
Gross Unrealized losses Due within one year	1,584	319
Fair value Due within one year	$ 154,991	$ 122,152
Weighted-average yield Due within one year	1.25%	1.06%
Amortized cost After 1 to 5 years	$ 236,368	$ 309,472
Noncredit Loss Component of OTTI Recorded in OCI After 1 to 5 years	0	0
Gross Unrealized gains After 1 to 5 years	0	28
Gross Unrealized losses After 1 to 5 years	4,480	3,735
Fair value After 1 to 5 years	$ 231,888	$ 305,765
Weighted-average yield After 1 to 5 years	1.82%	1.42%
Amortized cost After 5 to 10 years	$ 191,119	$ 133,451
Noncredit Loss Component of OTTI Recorded in OCI After 5 to 10 years	0	0
Gross Unrealized gains After 5 to 10 years	47	117
Fair value After 5 to 10 years	$ 185,661	$ 133,249
Weighted-average yield After 5 to 10 years	2.94%	2.72%
Amortized cost After 10 years	$ 43,638	$ 40,769
Noncredit Loss Component of OTTI Recorded in OCI After 10 years	0	0
Gross Unrealized gains After 10 years	0	1
Gross Unrealized losses After 10 years	241	149
Fair value After 10 years	$ 43,397	$ 40,621
Weighted-average yield After 10 years	2.50%	1.84%
Gross Unrealized losses After 5 to 10 years	$ 5,505	$ 319
Puerto Rico Government obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost After 5 to 10 years	4,013	4,071
Noncredit Loss Component of OTTI Recorded in OCI After 5 to 10 years	0	0
Gross Unrealized gains After 5 to 10 years	129	47
Fair value After 5 to 10 years	$ 4,142	$ 4,118
Weighted-average yield After 5 to 10 years	3.14%	3.14%
Amortized cost After 10 years	$ 4,111	$ 3,972
Noncredit Loss Component of OTTI Recorded in OCI After 10 years	0	0
Gross Unrealized gains After 10 years	0	0
Gross Unrealized losses After 10 years	1,313	1,277
Fair value After 10 years	$ 2,798	$ 2,695
Weighted-average yield After 10 years	6.97%	6.97%
Gross Unrealized losses After 5 to 10 years	$ 0	$ 0
United States And Puerto Rico Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	643,305	621,664
Noncredit Loss Component of OTTI Recorded in OCI	0	0
Gross Unrealized gain	176	193
Gross Unrealized loss	13,178	5,856
Investment securities available for sale	$ 630,303	$ 616,001
Weighted-average yield	2.10%	1.70%
Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 1,422,550	$ 1,281,690
Noncredit Loss Component of OTTI Recorded in OCI	5,467	5,731
Gross Unrealized gain	4,692	11,116
Gross Unrealized loss	41,357	12,578
Investment securities available for sale	$ 1,380,418	$ 1,274,497
Weighted-average yield	2.70%	2.54%
Mortgage Backed Securities [Member] | Freddie Mac (FHLMC) certificates [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost After 5 to 10 years	$ 96,598	$ 18,658
Noncredit Loss Component of OTTI Recorded in OCI After 5 to 10 years	0	0
Gross Unrealized gains After 5 to 10 years	8	14
Fair value After 5 to 10 years	$ 93,079	$ 18,609
Weighted-average yield After 5 to 10 years	2.09%	2.14%
Amortized cost After 10 years	$ 274,233	$ 297,733
Noncredit Loss Component of OTTI Recorded in OCI After 10 years	0	0
Gross Unrealized gains After 10 years	0	217
Gross Unrealized losses After 10 years	9,636	4,853
Fair value After 10 years	$ 264,597	$ 293,097
Weighted-average yield After 10 years	2.50%	2.23%
Amortized cost	$ 370,831	$ 316,391
Noncredit Loss Component of OTTI Recorded in OCI	0	0
Gross Unrealized gain	8	231
Gross Unrealized loss	13,163	4,916
Investment securities available for sale	357,676	311,706
Gross Unrealized losses After 5 to 10 years	$ 3,527	$ 63
Weighted-average yield	2.39%	2.23%
Mortgage Backed Securities [Member] | Ginnie Mae (GNMA) certificates [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost After 1 to 5 years	$ 160	$ 81
Noncredit Loss Component of OTTI Recorded in OCI After 1 to 5 years	0	0
Gross Unrealized gains After 1 to 5 years	2	1
Gross Unrealized losses After 1 to 5 years	0	0
Fair value After 1 to 5 years	$ 162	$ 82
Weighted-average yield After 1 to 5 years	3.52%	3.23%
Amortized cost After 5 to 10 years	$ 65,411	$ 69,661
Noncredit Loss Component of OTTI Recorded in OCI After 5 to 10 years	0	0
Gross Unrealized gains After 5 to 10 years	305	1,244
Fair value After 5 to 10 years	$ 65,002	$ 70,905
Weighted-average yield After 5 to 10 years	2.89%	3.05%
Amortized cost After 10 years	$ 122,975	$ 145,067
Noncredit Loss Component of OTTI Recorded in OCI After 10 years	0	0
Gross Unrealized gains After 10 years	2,962	5,910
Gross Unrealized losses After 10 years	1,030	334
Fair value After 10 years	$ 124,907	$ 150,643
Weighted-average yield After 10 years	3.93%	3.81%
Amortized cost	$ 188,546	$ 214,809
Noncredit Loss Component of OTTI Recorded in OCI	0	0
Gross Unrealized gain	3,269	7,155
Gross Unrealized loss	1,744	334
Investment securities available for sale	190,071	221,630
Gross Unrealized losses After 5 to 10 years	$ 714	$ 0
Weighted-average yield	3.57%	3.56%
Mortgage Backed Securities [Member] | Fannie Mae (FNMA) certificates [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost Due within one year	$ 379
Noncredit Loss Component of OTTI Recorded in OCI Due within one year	0
Gross Unrealized gains Due within one year	8
Gross Unrealized losses Due within one year	0
Fair value Due within one year	$ 387
Weighted-average yield Due within one year	1.91%
Amortized cost After 1 to 5 years	$ 25,872	$ 20,831
Noncredit Loss Component of OTTI Recorded in OCI After 1 to 5 years	0	0
Gross Unrealized gains After 1 to 5 years	0	294
Gross Unrealized losses After 1 to 5 years	468	109
Fair value After 1 to 5 years	$ 25,404	$ 21,016
Weighted-average yield After 1 to 5 years	2.75%	2.69%
Amortized cost After 5 to 10 years	$ 191,965	$ 49,934
Noncredit Loss Component of OTTI Recorded in OCI After 5 to 10 years	0	0
Gross Unrealized gains After 5 to 10 years	0	0
Fair value After 5 to 10 years	$ 184,983	$ 49,116
Weighted-average yield After 5 to 10 years	2.22%	1.83%
Amortized cost After 10 years	$ 557,882	$ 613,129
Noncredit Loss Component of OTTI Recorded in OCI After 10 years	0	0
Gross Unrealized gains After 10 years	1,055	3,180
Gross Unrealized losses After 10 years	18,909	6,401
Fair value After 10 years	$ 540,028	$ 609,908
Weighted-average yield After 10 years	2.65%	2.43%
Amortized cost	$ 776,098	$ 683,894
Noncredit Loss Component of OTTI Recorded in OCI	0	0
Gross Unrealized gain	1,063	3,474
Gross Unrealized loss	26,359	7,328
Investment securities available for sale	750,802	680,040
Gross Unrealized losses After 5 to 10 years	$ 6,982	$ 818
Weighted-average yield	2.55%	2.39%
Mortgage Backed Securities [Member] | Collateralized mortgage obligations guaranteed by the FHLMC and GNMA [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost After 1 to 5 years	$ 7,462	$ 5,918
Noncredit Loss Component of OTTI Recorded in OCI After 1 to 5 years	0	0
Gross Unrealized gains After 1 to 5 years	4	14
Gross Unrealized losses After 1 to 5 years	10	0
Fair value After 1 to 5 years	$ 7,456	$ 5,932
Weighted-average yield After 1 to 5 years	2.91%	2.21%
Amortized cost After 5 to 10 years		$ 2,556
Noncredit Loss Component of OTTI Recorded in OCI After 5 to 10 years		0
Gross Unrealized gains After 5 to 10 years		11
Fair value After 5 to 10 years		$ 2,567
Weighted-average yield After 5 to 10 years		2.23%
Amortized cost After 10 years	$ 59,575	$ 35,331
Noncredit Loss Component of OTTI Recorded in OCI After 10 years	0	0
Gross Unrealized gains After 10 years	348	231
Gross Unrealized losses After 10 years	81	0
Fair value After 10 years	$ 59,842	$ 35,562
Weighted-average yield After 10 years	3.07%	2.22%
Amortized cost	$ 67,037	$ 43,805
Noncredit Loss Component of OTTI Recorded in OCI	0	0
Gross Unrealized gain	352	256
Gross Unrealized loss	91	0
Investment securities available for sale	$ 67,298	44,061
Gross Unrealized losses After 5 to 10 years		$ 0
Weighted-average yield	3.05%	2.22%
Mortgage Backed Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost After 10 years	$ 20,038	$ 22,791
Noncredit Loss Component of OTTI Recorded in OCI After 10 years	5,467	5,731
Gross Unrealized gains After 10 years	0	0
Gross Unrealized losses After 10 years	0	0
Fair value After 10 years	$ 14,571	$ 17,060
Weighted-average yield After 10 years	4.57%	2.44%
Amortized cost	$ 20,038	$ 22,791
Noncredit Loss Component of OTTI Recorded in OCI	5,467	5,731
Gross Unrealized gain	0	0
Gross Unrealized loss	0	0
Investment securities available for sale	$ 14,571	$ 17,060
Weighted-average yield	4.57%	2.44%
Other Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost Due within one year		$ 100
Noncredit Loss Component of OTTI Recorded in OCI Due within one year		0
Gross Unrealized gains Due within one year		0
Gross Unrealized losses Due within one year		0
Fair value Due within one year		$ 100
Weighted-average yield Due within one year		1.48%
Amortized cost After 1 to 5 years	$ 500
Noncredit Loss Component of OTTI Recorded in OCI After 1 to 5 years	0
Gross Unrealized gains After 1 to 5 years	0
Gross Unrealized losses After 1 to 5 years	0
Fair value After 1 to 5 years	$ 500
Weighted-average yield After 1 to 5 years	2.96%
Amortized cost	$ 500	$ 100
Noncredit Loss Component of OTTI Recorded in OCI	0	0
Gross Unrealized gain	0	0
Gross Unrealized loss	0	0
Investment securities available for sale	$ 500	$ 100
Weighted-average yield	2.96%	1.48%

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- Definition

Total of accumulated other comprehensive loss related to that portion of OTTI due to factors other than credit losses on debt securities categorized either as available-for-sale or held-to-maturity that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security, maturing in sixth fiscal year through tenth fiscal year following latest fiscal year.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.This represents single maturity date and allocated without single maturity date, maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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Weighted average yield of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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