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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 1,497,464 | $ 1,263,777 | $ 1,443,006 | $ 1,217,317
Other Comprehensive Income (Loss) Before Reclassifications, net of tax | (220) | (62) | (244) | 18
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (78) | (26) | (141) | (52)
Total Other Comprehensive Income (Loss) | (298) | (88) | (385) | (34)
Ending balance | 1,565,652 | 1,328,439 | 1,565,652 | 1,328,439
Pension and Other Postretirement Benefits |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 1,301 | 1,308 | 1,375 | 1,334
Other Comprehensive Income (Loss) Before Reclassifications, net of tax | 0 | 0 | 0 | 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (29) | (27) | (103) | (53)
Total Other Comprehensive Income (Loss) | (29) | (27) | (103) | (53)
Ending balance | 1,272 | 1,281 | 1,272 | 1,281
Net Unrealized Losses on Available-for-Sale Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (240) | (339) | (227) | (419)
Other Comprehensive Income (Loss) Before Reclassifications, net of tax | (220) | (62) | (244) | 18
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (49) | 1 | (38) | 1
Total Other Comprehensive Income (Loss) | (269) | (61) | (282) | 19
Ending balance | (509) | (400) | (509) | (400)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 1,061 | 969 | 1,148 | 915
Total Other Comprehensive Income (Loss) | (298) | (88) | (385) | (34)
Ending balance | $ 763 | $ 881 | $ 763 | $ 881

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