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INVESTMENT SECURITIES - Investment Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized cost	$ 144,672	$ 144,815
Held to Maturity Fair value	123,114	125,658
Municipal Bonds [Member] | PUERTO RICO
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost After 1 to 5 years	5,957	6,100
Held to Maturity Gross Unrecognized gains After 1 to 5 years	0	0
Held to Maturity Gross Unrecognized losses After 1 to 5 year	402	435
Held to Maturity Fair value After 1 to 5 years	$ 5,555	$ 5,665
Held to Maturity Weighted-average yield After 1 to 5 years	4.96%	4.79%
Held to Maturity Amortized Cost After 5 to 10 years	$ 53,016	$ 53,016
Held to Maturity Gross Unrecognized gains After 5 to 10 yearss	0	0
Held to Maturity Gross Unrecognized losses After 5 to 10 year	5,684	5,360
Held to Maturity Fair value After 5 to 10 years	$ 47,332	$ 47,656
Held to Maturity Weighted-average yield After 5 to 10 years	6.11%	6.00%
Held to Maturity Amortized Cost After 10 years	$ 85,699	$ 85,699
Held to Maturity Gross Unrecognized gains After 10	0	0
Held to Maturity Gross Unrecognized losses After 10	15,472	13,362
Held to Maturity Fair value After 10 years	$ 70,227	$ 72,337
Held to Maturity Weighted-average yield After 10 years	6.03%	5.86%
Held to Maturity Amortized cost	$ 144,672	$ 144,815
Held to Maturity Gross Unrecognized gains	0	0
Held to Maturity Gross Unrecognized losses	21,558	19,157
Held to Maturity Fair value	$ 123,114	$ 125,658
Held to Maturity Weighted-average yield	6.02%	5.86%

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