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Comprehensive Income/Loss (Comprised of the following Components) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | $ (114,827) | $ (163,084)
Net change in other comprehensive income (loss) | $ 5,113 | $ (16,990) | 602 | 10,149
Ending Balance | (114,225) | (152,935) | (114,225) | (152,935)
Unrealized Gain (Loss) on Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (96,231) | (128,657)
Net change in other comprehensive income (loss) |  |  | 384 | 5,617
Ending Balance | (95,847) | (123,040) | (95,847) | (123,040)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (20,575) | (36,630)
Net change in other comprehensive income (loss) |  |  | 247 | 4,715
Ending Balance | (20,328) | (31,915) | (20,328) | (31,915)
Defined Benefit Postretirement Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | 1,979 | 2,203
Net change in other comprehensive income (loss) |  |  | (29) | (183)
Ending Balance | 1,950 | 2,020 | 1,950 | 2,020
AOCI Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net change in other comprehensive income (loss) | $ 5,113 | $ (16,990) | $ 602 | $ 10,149

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