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v3.23.2

Accumulated Other Comprehensive Income (Loss) - Change in AOCI Components Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | $ 1,354,430 | $ 1,316,995 | $ 1,448,885 | $ 1,611,611 | $ 1,316,995 | $ 1,611,611
Total Other Comprehensive Income (Loss) | (18,133) | 29,360 | (122,295) | (179,771) | 11,227 | (302,066)
Balance at End of Period | 1,358,279 | 1,354,430 | 1,348,746 | 1,448,885 | 1,358,279 | 1,348,746
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 | (216,588) | (240,783) | (213,113) | (32,940) | (240,783) | (32,940)
Other Comprehensive Income (Loss) Before Reclassifications | (23,215) |  | (122,645) |  | 980 | (302,818)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 0 |  | 0 |  | 0 | 0
Total Other Comprehensive Income (Loss) | (23,215) |  | (122,645) |  | 980 | (302,818)
Balance at End of Period | (239,803) | (216,588) | (335,758) | (213,113) | (239,803) | (335,758)
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 | (163,716) | (168,797) | 103 | 54 | (168,797) | 54
Other Comprehensive Income (Loss) Before Reclassifications | 0 |  | 0 |  | 0 | 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 4,998 |  | (2) |  | 10,079 | 47
Total Other Comprehensive Income (Loss) | 4,998 |  | (2) |  | 10,079 | 47
Balance at End of Period | (158,718) | (163,716) | 101 | 103 | (158,718) | 101
Defined Benefit Plans |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | (24,994) | (25,078) | (33,143) | (33,496) | (25,078) | (33,496)
Other Comprehensive Income (Loss) Before Reclassifications | 0 |  | 0 |  | 0 | 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 84 |  | 352 |  | 168 | 705
Total Other Comprehensive Income (Loss) | 84 |  | 352 |  | 168 | 705
Balance at End of Period | (24,910) | (24,994) | (32,791) | (33,143) | (24,910) | (32,791)
Accum.Other Comprehensive Income (Loss) |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | (405,298) | (434,658) | (246,153) | (66,382) | (434,658) | (66,382)
Other Comprehensive Income (Loss) Before Reclassifications | (23,215) |  | (122,645) |  | 980 | (302,818)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 5,082 |  | 350 |  | 10,247 | 752
Total Other Comprehensive Income (Loss) | (18,133) | 29,360 | (122,295) | (179,771) | 11,227 | (302,066)
Balance at End of Period | $ (423,431) | $ (405,298) | $ (368,448) | $ (246,153) | $ (423,431) | $ (368,448)

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