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INVESTMENT SECURITIES - Investment Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized cost	$ 144,799	$ 150,627
Held to Maturity Gross Unrecognized gains	0	0
Held to Maturity Gross Unrecognized losses	13,096	19,595
Held to Maturity Fair value	$ 131,703	$ 131,032
Held to Maturity Weighted-average yield	5.79%	5.03%
Municipal Bonds [Member] | PUERTO RICO
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 1 to 5 years	$ 6,096	$ 3,853
Held to Maturity Gross Unrecognized gains After 1 to 5 years	0	0
Held to Maturity Gross Unrecognized losses After 1 to 5 year	364	173
Held to Maturity Fair value After 1 to 5 years	$ 5,732	$ 3,680
Held to Maturity Weighted-average yield After 1 to 5 years	4.73%	5.38%
Held to Maturity Amortized Cost After 5 to 10 years	$ 53,006	$ 39,523
Held to Maturity Gross Unrecognized gains After 5 to 10 yearss	0	0
Held to Maturity Gross Unrecognized losses After 5 to 10 year	3,374	3,048
Held to Maturity Fair value After 5 to 10 years	$ 49,632	$ 36,475
Held to Maturity Weighted-average yield After 5 to 10 years	5.94%	5.28%
Held to Maturity Amortized Cost After 10 years	$ 85,697	$ 107,251
Held to Maturity Gross Unrecognized gains After 10	0	0
Held to Maturity Gross Unrecognized losses After 10	9,358	16,374
Held to Maturity Fair value After 10 years	$ 76,339	$ 90,877
Held to Maturity Weighted-average yield After 10 years	5.78%	4.93%
Held to Maturity Amortized cost	$ 144,799	$ 150,627
Held to Maturity Gross Unrecognized gains	0	0
Held to Maturity Gross Unrecognized losses	13,096	19,595
Held to Maturity Fair value	$ 131,703	$ 131,032
Held to Maturity Weighted-average yield	5.79%	5.03%

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