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OTHER COMPREHENSIVE (LOSS) INCOME - Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Detail) - Reclassification Out Of Accumulated Other Comprehensive Income [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | $ (9) | $ (5,288) | $ (136) | $ (11,749)
Reclassification from AOCI, Current Period, Tax | 0 | 0 | 0 | 0
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (9) | (5,288) | (136) | (11,749)
Realized gain on sale of debt securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 0 | (5,288) | 0 | (13,380)
Provision for credit losses (benefit) expense |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | $ (9) | $ 0 | $ (136) | $ 1,631

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