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Accumulated Other Comprehensive Income (Loss) - Changes in components of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Balance at the beginning of the period |  |  | $ (582,536) |
Net comprehensive income (loss) | $ 140,571 | $ (153,491) | 102,896 | $ (138,801)
Balance at the end of the period | (479,640) |  | (479,640) |
Benefit Plans |  |  |  |
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Balance at the beginning of the period | 627 | (673) | 627 | (673)
Balance at the end of the period | 627 | (673) | 627 | (673)
Unrealized Gains (Losses) on Securities Available for Sale |  |  |  |
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Balance at the beginning of the period | (620,838) | (661,725) | (583,163) | (676,415)
Other comprehensive income (loss) before reclassifications | 140,571 | (153,491) | 102,896 | (138,768)
Amounts reclassified from accumulated other comprehensive loss |  |  |  | (33)
Net comprehensive income (loss) | 140,571 | (153,491) | 102,896 | (138,801)
Balance at the end of the period | (480,267) | (815,216) | (480,267) | (815,216)
Accumulated Other Comprehensive Loss |  |  |  |
Accumulated Other Comprehensive (Loss) Income |  |  |  |
Balance at the beginning of the period | (620,211) | (662,398) | (582,536) | (677,088)
Other comprehensive income (loss) before reclassifications | 140,571 | (153,491) | 102,896 | (138,768)
Amounts reclassified from accumulated other comprehensive loss |  |  |  | (33)
Net comprehensive income (loss) | 140,571 | (153,491) | 102,896 | (138,801)
Balance at the end of the period | $ (479,640) | $ (815,889) | $ (479,640) | $ (815,889)

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