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Other Comprehensive Income (Loss) - Accumulated Balances for Each Component of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Accumulated balances for component of other comprehensive income, net of tax |  |
Unrealized losses on securities | $ (198,769) | $ (219,766)
Unrealized gains on derivative instruments | 15,363 | 18,956
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations | (8,055) | (8,227)
Total accumulated other comprehensive loss | $ (191,461) | $ (209,037)

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