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DEBT SECURITIES - Investments Securities Held to Maturity (Securities in continuous unrealized loss position) (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |
HTM Fair Value Less than 12 months | $ 0 | $ 260,106
HTM Unrealized Losses Less than 12 months | 0 | 11,721
HTM Fair Value 12 months or more | 266,963 | 98,797
HTM Unrealized Losses 12 months or more | 21,137 | 2,769
HTM Fair Value | 266,963 | 358,903
HTM Unrealized Losses | 21,137 | 14,490
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 | 34,244 | 98,797
HTM Unrealized Losses 12 months or more | 1,405 | 2,769
HTM Fair Value | 34,244 | 98,797
HTM Unrealized Losses | 1,405 | 2,769
Commercial MBS [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
HTM Fair Value Less than 12 months | 0 | 100,523
HTM Unrealized Losses Less than 12 months | 0 | 4,565
HTM Fair Value 12 months or more | 94,103 | 0
HTM Unrealized Losses 12 months or more | 7,698 | 0
HTM Fair Value | 94,103 | 100,523
HTM Unrealized Losses | 7,698 | 4,565
FHLMC [Member] | Residential MBS [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
HTM Fair Value Less than 12 months | 0 | 39,171
HTM Unrealized Losses Less than 12 months | 0 | 1,634
HTM Fair Value 12 months or more | 33,500 | 0
HTM Unrealized Losses 12 months or more | 2,820 | 0
HTM Fair Value | 33,500 | 39,171
HTM Unrealized Losses | 2,820 | 1,634
GNMA [Member] | Residential MBS [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
HTM Fair Value Less than 12 months | 0 | 18,188
HTM Unrealized Losses Less than 12 months | 0 | 943
HTM Fair Value 12 months or more | 15,372 | 0
HTM Unrealized Losses 12 months or more | 1,414 | 0
HTM Fair Value | 15,372 | 18,188
HTM Unrealized Losses | 1,414 | 943
FNMA [Member] | Residential MBS [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
HTM Fair Value Less than 12 months | 0 | 69,192
HTM Unrealized Losses Less than 12 months | 0 | 3,155
HTM Fair Value 12 months or more | 62,486 | 0
HTM Unrealized Losses 12 months or more | 5,902 | 0
HTM Fair Value | 62,486 | 69,192
HTM Unrealized Losses | 5,902 | 3,155
CMOs issued or guaranteed by the FHLMC, FNMA, and GNMA: [Member] | Residential MBS [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
HTM Fair Value Less than 12 months | 0 | 33,032
HTM Unrealized Losses Less than 12 months | 0 | 1,424
HTM Fair Value 12 months or more | 27,258 | 0
HTM Unrealized Losses 12 months or more | 1,898 | 0
HTM Fair Value | 27,258 | 33,032
HTM Unrealized Losses | $ 1,898 | $ 1,424

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