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DEBT SECURITIES - Investments Securities Held to Maturity (Securities in continous unrealized loss position) (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Schedule Of Held To Maturity Securities [Line Items] |  |
HTM Fair Value Less than 12 months | $ 268,552 |
HTM Unrealized Losses Less than 12 months | 11,924 |
HTM Fair Value 12 months or more | 121,440 |
HTM Unrealized Losses 12 months or more | 7,553 |
HTM Fair Value | 389,992 |
HTM Unrealized Losses | 19,477 |
FHLMC [Member] | Mortgage Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
HTM Fair Value Less than 12 months | 40,381 |
HTM Unrealized Losses Less than 12 months | 2,131 |
HTM Fair Value 12 months or more | 0 |
HTM Unrealized Losses 12 months or more | 0 |
HTM Fair Value | 40,381 |
HTM Unrealized Losses | 2,131 |
GNMA [Member] | Mortgage Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
HTM Fair Value Less than 12 months | 18,821 |
HTM Unrealized Losses Less than 12 months | 1,157 |
HTM Fair Value 12 months or more | 0 |
HTM Unrealized Losses 12 months or more | 0 |
HTM Fair Value | 18,821 |
HTM Unrealized Losses | 1,157 |
FNMA [Member] | Mortgage Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
HTM Fair Value Less than 12 months | 79,155 |
HTM Unrealized Losses Less than 12 months | 4,273 |
HTM Fair Value 12 months or more | 0 |
HTM Unrealized Losses 12 months or more | 0 |
HTM Fair Value | 79,155 |
HTM Unrealized Losses | 4,273 |
Collateralized Mortgage Obligations [Member] | Mortgage Backed Securities [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
HTM Fair Value Less than 12 months | 130,195 |
HTM Unrealized Losses Less than 12 months | 4,363 |
HTM Fair Value 12 months or more | 0 |
HTM Unrealized Losses 12 months or more | 0 |
HTM Fair Value | 130,195 |
HTM Unrealized Losses | 4,363 |
Puerto Rico [Member] | Municipal Bonds [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
HTM Fair Value Less than 12 months | 0 | $ 0
HTM Unrealized Losses Less than 12 months | 0 | 0
HTM Fair Value 12 months or more | 121,440 | 140,732
HTM Unrealized Losses 12 months or more | 7,553 | 13,072
HTM Fair Value | 121,440 | 140,732
HTM Unrealized Losses | $ 7,553 | $ 13,072

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