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Other Comprehensive Income - Accumulated Balances for Each Component of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | --- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total accumulated other comprehensive loss | $ 3,825,778 | $ 3,778,854 | $ 2,727,105 | $ 2,678,318 | $ 2,658,078 | $ 2,354,701 | $ 2,322,350 | $ 2,297,383
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total accumulated other comprehensive loss | (101,170) | $ (114,041) | $ (121,621) | (142,608) | $ (129,094) | $ (154,116) | $ (156,943) | $ (154,256)
Unrealized losses on securities |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total accumulated other comprehensive loss | (108,006) |  |  | (152,934) |  |  |  |
Unrealized gains on derivative instruments |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total accumulated other comprehensive loss | 13,716 |  |  | 17,429 |  |  |  |
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total accumulated other comprehensive loss | $ (6,880) |  |  | $ (7,103) |  |  |  |

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