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v3.23.3

Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Net of tax |  |  |  |  |
Balance | $ 2,359,738 | $ 2,252,611 | $ 2,269,005 | $ 2,656,912 | $ 2,656,912
Unrealized net losses related to the transfer of securities from available-for-sale to held-to-maturity |  |  |  |  | (372,400)
Other comprehensive (loss) income | (35,995) | (87,299) | (9,477) | (537,063) |
Balance | 2,351,009 | 2,200,651 | 2,351,009 | 2,200,651 | 2,269,005
Accumulated other comprehensive loss |  |  |  |  |
Net of tax |  |  |  |  |
Balance | (612,736) | (571,457) | (639,254) | (121,693) | (121,693)
Other comprehensive (loss) income | (35,995) | (87,299) | (9,477) | (537,063) |
Balance | (648,731) | (658,756) | (648,731) | (658,756) | (639,254)
Pensions and Other Benefits |  |  |  |  |
Net of tax |  |  |  |  |
Balance | (5,431) | (24,390) | (5,431) | (24,390) | (24,390)
Balance | (5,431) | (24,390) | (5,431) | (24,390) | (5,431)
Investment securities |  |  |  |  |
Net of tax |  |  |  |  |
Other comprehensive (loss) income | (36,985) | (84,164) | (10,746) | (531,086) |
Available-for-sale Investment securities |  |  |  |  |
Net of tax |  |  |  |  |
Balance | (284,100) | (220,021) | (292,175) | (97,303) | (97,303)
Unrealized net losses related to the transfer of securities from available-for-sale to held-to-maturity |  | 33,603 |  | 372,419 |
Other comprehensive (loss) income | (45,369) | (95,323) | (37,294) | (556,857) |
Balance | (329,469) | (281,741) | (329,469) | (281,741) | (292,175)
Held-to-Maturity Investment Securities |  |  |  |  |
Net of tax |  |  |  |  |
Balance | (318,782) | (324,204) | (336,946) |  |
Unrealized net losses related to the transfer of securities from available-for-sale to held-to-maturity |  | (33,603) |  | (372,419) |
Other comprehensive (loss) income | 8,384 | 11,159 | 26,548 | 25,771 |
Balance | (310,398) | (346,648) | (310,398) | (346,648) | (336,946)
Cash Flow Derivative Hedges |  |  |  |  |
Net of tax |  |  |  |  |
Balance | (4,423) | (2,842) | (4,702) |  |
Other comprehensive (loss) income | 990 | (3,135) | 1,269 | (5,977) |
Balance | $ (3,433) | $ (5,977) | $ (3,433) | $ (5,977) | $ (4,702)

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