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Accumulated other comprehensive income table (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ (163,084) | $ 2,183 | $ 40,695
Total other comprehensive income (loss) | 48,257 | (165,267) | (38,512)
Ending Balance | (114,827) | (163,084) | 2,183
Unrealized Gain (Loss) on Securities |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning Balance | (128,657) | (9,667) | 13,255
Total other comprehensive income (loss) | 32,426 | (118,990) | (22,922)
Ending Balance | (96,231) | (128,657) | (9,667)
Unrealized Gain (Loss) on Cash Flow Hedge |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning Balance | (36,630) | 14,137 | 33,276
Total other comprehensive income (loss) | 16,055 | (50,767) | (19,139)
Ending Balance | (20,575) | (36,630) | 14,137
Defined Benefit Postretirement Plans |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning Balance | 2,203 | (2,287) | (5,836)
Total other comprehensive income (loss) | (224) | 4,490 | 3,549
Ending Balance | 1,979 | 2,203 | (2,287)
AOCI Attributable to Parent [Member] |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Total other comprehensive income (loss) | $ 48,257 | $ (165,267) | $ (38,512)

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