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v3.23.3

Accumulated Other Comprehensive Income (Loss) - Change in AOCI Components Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | $ 1,358,279 | $ 1,354,430 | $ 1,316,995 | $ 1,348,746 | $ 1,448,885 | $ 1,611,611 | $ 1,316,995 | $ 1,611,611
Total Other Comprehensive Income (Loss) | (18,180) | (18,133) | 29,360 | (79,246) | (122,295) | (179,771) | (6,953) | (381,312)
Balance at End of Period | 1,363,840 | 1,358,279 | 1,354,430 | 1,282,384 | 1,348,746 | 1,448,885 | 1,363,840 | 1,282,384
Unrealized Gains and Losses on Net Investment Securities | Available-for-sale Securities |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | (239,803) |  | (240,783) | (335,758) |  | (32,940) | (240,783) | (32,940)
Other Comprehensive Income (Loss) Before Reclassifications | (26,596) |  |  | (81,832) |  |  | (25,616) | (384,650)
Unrealized Net Losses Related to the Transfer of Securities from Available-for-Sale to Held-to-Maturity |  |  |  | 176,700 |  |  |  | 176,700
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 3,345 |  |  | 0 |  |  | 3,345 | 0
Total Other Comprehensive Income (Loss) | (23,251) |  |  | 94,868 |  |  | (22,271) | (207,950)
Balance at End of Period | (263,054) | (239,803) |  | (240,890) | (335,758) |  | (263,054) | (240,890)
Unrealized Gains and Losses on Net Investment Securities | Held-to-maturity Securities |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | (158,718) |  | (168,797) | 101 |  | 54 | (168,797) | 54
Other Comprehensive Income (Loss) Before Reclassifications | 0 |  |  | 0 |  |  | 0 | 0
Unrealized Net Losses Related to the Transfer of Securities from Available-for-Sale to Held-to-Maturity |  |  |  | (176,700) |  |  |  | (176,700)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 4,987 |  |  | 2,232 |  |  | 15,066 | 2,279
Total Other Comprehensive Income (Loss) | 4,987 |  |  | (174,468) |  |  | 15,066 | (174,421)
Balance at End of Period | (153,731) | (158,718) |  | (174,367) | 101 |  | (153,731) | (174,367)
Defined Benefit Plans |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | (24,910) |  | (25,078) | (32,791) |  | (33,496) | (25,078) | (33,496)
Other Comprehensive Income (Loss) Before Reclassifications | 0 |  |  | 0 |  |  | 0 | 0
Unrealized Net Losses Related to the Transfer of Securities from Available-for-Sale to Held-to-Maturity |  |  |  | 0 |  |  |  | 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 84 |  |  | 354 |  |  | 252 | 1,059
Total Other Comprehensive Income (Loss) | 84 |  |  | 354 |  |  | 252 | 1,059
Balance at End of Period | (24,826) | (24,910) |  | (32,437) | (32,791) |  | (24,826) | (32,437)
Accum.Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balance at Beginning of Period | (423,431) | (405,298) | (434,658) | (368,448) | (246,153) | (66,382) | (434,658) | (66,382)
Other Comprehensive Income (Loss) Before Reclassifications | (26,596) |  |  | (81,832) |  |  | (25,616) | (384,650)
Unrealized Net Losses Related to the Transfer of Securities from Available-for-Sale to Held-to-Maturity |  |  |  | 0 |  |  |  | 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 8,416 |  |  | 2,586 |  |  | 18,663 | 3,338
Total Other Comprehensive Income (Loss) | (18,180) | (18,133) | 29,360 | (79,246) | (122,295) | (179,771) | (6,953) | (381,312)
Balance at End of Period | $ (441,611) | $ (423,431) | $ (405,298) | $ (447,694) | $ (368,448) | $ (246,153) | $ (441,611) | $ (447,694)

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