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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, 2025
Dec. 31, 2024
Dec. 31, 2023
Amount Before Tax      
Total $ 281,999 $ (8,402) $ 184,138
Tax Benefit (Expense)      
Total (76,460) 2,590 (49,749)
Amount Net of Tax      
Net unrealized gain arising during the year 197,377 (141,496) 97,565
Reclassification adjustment for net realized gains (losses) included in net income 8,162 135,684 36,824
Total 205,539 (5,812) 134,389
Investment Securities Available- for-Sale      
Amount Before Tax      
Net unrealized gain arising during the year 255,998 (145,673) 124,233
Reclassification adjustment for net realized gains (losses) included in net income (528) 141,418 31,533
Total 255,470 (4,255) 155,766
Tax Benefit (Expense)      
Net unrealized gain arising during the year (69,408) 39,226 (33,579)
Reclassification adjustment for net realized gains (losses) included in net income 143 (37,839) (8,477)
Total (69,265) 1,387 (42,056)
Amount Net of Tax      
Net unrealized gain arising during the year 186,590 (106,447) 90,654
Reclassification adjustment for net realized gains (losses) included in net income (385) 103,579 23,056
Total 186,205 (2,868) 113,710
Derivative Financial Instruments      
Amount Before Tax      
Net unrealized gain arising during the year 8,099 (51,383) (6,701)
Reclassification adjustment for net realized gains (losses) included in net income 10,207 42,039 14,938
Total 18,306 (9,344) 8,237
Tax Benefit (Expense)      
Net unrealized gain arising during the year (2,197) 13,937 1,818
Reclassification adjustment for net realized gains (losses) included in net income (2,768) (11,324) (4,050)
Total (4,965) 2,613 (2,232)
Amount Net of Tax      
Net unrealized gain arising during the year 5,902 (37,446) (4,883)
Reclassification adjustment for net realized gains (losses) included in net income 7,439 30,715 10,888
Total 13,341 (6,731) 6,005
Defined Benefit Pension and Other Postretirement Benefit Plans      
Amount Before Tax      
Net unrealized gain arising during the year 6,703 3,290 16,183
Reclassification adjustment for net realized gains (losses) included in net income 1,520 1,907 3,952
Total 8,223 5,197 20,135
Tax Benefit (Expense)      
Net unrealized gain arising during the year (1,818) (893) (4,389)
Reclassification adjustment for net realized gains (losses) included in net income (412) (517) (1,072)
Total (2,230) (1,410) (5,461)
Amount Net of Tax      
Net unrealized gain arising during the year 4,885 2,397 11,794
Reclassification adjustment for net realized gains (losses) included in net income 1,108 1,390 2,880
Total $ 5,993 $ 3,787 $ 14,674