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Comprehensive Income/Loss (Comprised of the following Components) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | $ (163,084) | $ 2,183
Net change in other comprehensive income (loss) | $ (16,990) | $ (31,262) | 10,149 | (111,647)
Ending Balance | (152,935) | (109,464) | (152,935) | (109,464)
Unrealized Gain (Loss) on Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (128,657) | (9,667)
Net change in other comprehensive income (loss) |  |  | 5,617 | (86,290)
Ending Balance | (123,040) | (95,957) | (123,040) | (95,957)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | (36,630) | 14,137
Net change in other comprehensive income (loss) |  |  | 4,715 | (25,599)
Ending Balance | (31,915) | (11,462) | (31,915) | (11,462)
Defined Benefit Postretirement Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | 2,203 | (2,287)
Net change in other comprehensive income (loss) |  |  | (183) | 242
Ending Balance | 2,020 | (2,045) | 2,020 | (2,045)
AOCI Attributable to Parent [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net change in other comprehensive income (loss) | $ (16,990) | $ (31,262) | $ 10,149 | $ (111,647)

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