INVESTMENT SECURITIES - Investment Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Fair value	$ 166,974		$ 110,374
Allowance for credit losses, Held-to-Maturity securities	10,176		0
Municipal Bonds [Member] \| PUERTO RICO
Schedule Of Held To Maturity Securities [Line Items]
Held to Maturity Amortized Cost Due within one year	550		321
Held to Maturity Gross Unrecognized gains Due within one year	0		0
Held to Maturity Gross Unrecognized losses Due within one year	26		6
Held to Maturity Fair value Due within one year	524		$ 315
Allowance for credit losses Due within one year	$ 133
Held to Maturity Weighted-average yield Due within one year	5.41%		5.84%
Held to Maturity Amortized Cost After 1 to 5 years	$ 17,203		$ 8,264
Held to Maturity Gross Unrecognized gains After 1 to 5 years	0		0
Held to Maturity Gross Unrecognized losses After 1 to 5 years	611		736
Held to Maturity Fair value After 1 to 5 years	16,592		$ 7,528
Allowance for credit losses After 1 to 5 years	$ 375
Held to Maturity Weighted-average yield After 1 to 5 years	3.11%		5.18%
Held to Maturity Amortized Cost After 5 to 10 years	$ 88,224		$ 56,511
Held to Maturity Gross Unrecognized gains After 5 to 10 years	0		0
Held to Maturity Gross Unrecognized losses After 5 to 10 years	5,387		8,646
Held to Maturity Fair value After 5 to 10 years	82,837		$ 47,865
Allowance for credit losses After 5 to 10 years	$ 3,773
Held to Maturity Weighted-average yield After 5 to 10 years	4.68%		5.77%
Held to Maturity Amortized Cost After 10 years	$ 83,179		$ 73,579
Held to Maturity Gross Unrecognized gains After 10 years	0		0
Held to Maturity Gross Unrecognized losses After 10 years	16,158		18,913
Held to Maturity Fair value After 10 years	67,021		$ 54,666
Allowance for credit losses After 10 years	$ 5,895
Held to Maturity Weighted-average yield After 10 years	3.62%		5.44%
Held to Maturity Amortized cost	$ 189,156		$ 138,675
Held to Maturity Gross Unrecognized gains	0		0
Held to Maturity Gross Unrecognized losses	22,182		28,301
Held to Maturity Fair value	166,974		110,374
Allowance for credit losses, Held-to-Maturity securities	$ 10,176	$ 9,268	$ 0
Held to Maturity Weighted-average yield	4.07%		5.56%

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