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Accumulated Other Comprehensive (Loss), Net of Tax - Schedule of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
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)