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Accumulated Other Comprehensive (Loss), Net of Tax - Schedule of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Amount Before Tax |  |  |
Total | $ (8,402) | $ 184,138 | $ (908,232)
Tax Benefit (Expense) |  |  |
Total | 2,590 | (49,749) | 245,852
Amount Net of Tax |  |  |
Net unrealized (losses) arising during the year | (109,454) | 102,251 | (671,816)
Reclassification adjustment for net realized losses included in net income | 103,642 | 32,138 | 9,436
Total | (5,812) | 134,389 | (662,380)
Investment Securities Available- for-Sale |  |  |
Amount Before Tax |  |  |
Net unrealized (losses) arising during the year | (143,049) | 118,410 | (878,366)
Reclassification adjustment for net realized losses included in net income | 138,794 | 37,356 | 6,751
Total | (4,255) | 155,766 | (871,615)
Tax Benefit (Expense) |  |  |
Net unrealized (losses) arising during the year | 38,421 | (32,019) | 237,710
Reclassification adjustment for net realized losses included in net income | (37,034) | (10,037) | (1,791)
Total | 1,387 | (42,056) | 235,919
Amount Net of Tax |  |  |
Net unrealized (losses) arising during the year | (104,628) | 86,391 | (640,656)
Reclassification adjustment for net realized losses included in net income | 101,760 | 27,319 | 4,960
Total | (2,868) | 113,710 | (635,696)
Derivative Financial Instruments |  |  |
Amount Before Tax |  |  |
Net unrealized (losses) arising during the year | (9,911) | 5,578 | (24,440)
Reclassification adjustment for net realized losses included in net income | 567 | 2,659 | 3,932
Total | (9,344) | 8,237 | (20,508)
Tax Benefit (Expense) |  |  |
Net unrealized (losses) arising during the year | 2,688 | (1,512) | 6,630
Reclassification adjustment for net realized losses included in net income | (75) | (720) | (1,066)
Total | 2,613 | (2,232) | 5,564
Amount Net of Tax |  |  |
Net unrealized (losses) arising during the year | (7,223) | 4,066 | (17,810)
Reclassification adjustment for net realized losses included in net income | 492 | 1,939 | 2,866
Total | (6,731) | 6,005 | (14,944)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |
Amount Before Tax |  |  |
Net unrealized (losses) arising during the year | 3,290 | 16,183 | (18,319)
Reclassification adjustment for net realized losses included in net income | 1,907 | 3,952 | 2,210
Total | 5,197 | 20,135 | (16,109)
Tax Benefit (Expense) |  |  |
Net unrealized (losses) arising during the year | (893) | (4,389) | 4,969
Reclassification adjustment for net realized losses included in net income | (517) | (1,072) | (600)
Total | (1,410) | (5,461) | 4,369
Amount Net of Tax |  |  |
Net unrealized (losses) arising during the year | 2,397 | 11,794 | (13,350)
Reclassification adjustment for net realized losses included in net income | 1,390 | 2,880 | 1,610
Total | $ 3,787 | $ 14,674 | $ (11,740)

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