ACCUMULATED OTHER COMPREHENSIVE LOSS - Change in Accumulated Other Comprehensive Loss by Component (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
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| Unrealized net holding losses on available-for-sale debt securities:[Y | ||
| Beginning balance | $ (354,940) | $ (567,338) |
| Other comprehensive (loss) income | (6,168) | 84,061 |
| Ending balance | (361,108) | (483,277) |
| Adjustment of pension and postretirement benefit plans: | ||
| Beginning balance | 390 | 782 |
| Other comprehensive (loss) income | 0 | 0 |
| Ending balance | $ 390 | $ 782 |
| X | ||||||||||
- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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- References No definition available.
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| X | ||||||||||
- Definition Amount, after tax and adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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