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OTHER COMPREHENSIVE INCOME - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Before-Tax Amount |  |  |  |  |
Other comprehensive income | $ 2,170 | $ 4,605 | $ 4,193 | $ 4,551 |
Tax Benefit (Expense) |  |  |  |  |
Other comprehensive income | (513) | (1,053) | (1,000) | (1,068) |
Net-of-Tax Amount |  |  |  |  |
Other comprehensive income | 1,657 | 3,552 | 3,193 | 3,483 | $ 908
Unrealized Gains (Losses) on AFS Securities |  |  |  |  |
Before-Tax Amount |  |  |  |  |
Net unrealized gains arising during the period | 2,170 | 4,605 | 4,193 | 4,383 |
Reclassification for net loss on exchanged security, included in net income, net of tax |  |  | 0 | 168 |
Tax Benefit (Expense) |  |  |  |  |
Net unrealized gains arising during the period | (513) | (1,053) | (1,000) | (1,030) |
Reclassification for net loss on exchanged security, included in net income, net of tax |  |  | 0 | (38) |
Net-of-Tax Amount |  |  |  |  |
Net unrealized gains arising during the period | $ 1,657 | $ 3,552 | 3,193 | 3,353 |
Reclassification for net loss on exchanged security, included in net income, net of tax |  |  | $ 0 | $ 130 |
Other comprehensive income |  |  |  |  | $ 1,248

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