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Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2025
Equity [Abstract]  
Component of Other Comprehensive Income (Loss)
The tax effects allocated to each component of other comprehensive income (loss) were as follows:
Before Tax
Amount		Tax Expense,
(Benefit)		Net of Tax
Amount
2025
Securities available for sale and transferred securities:
Change in net unrealized gain/loss during the period$514,556 $108,056 $406,500 
Change in net unrealized gain on securities transferred to held to maturity(521)(109)(412)
Reclassification adjustment for net (gains) losses included in net income850 179 671 
Total securities available for sale and transferred securities514,885 108,126 406,759 
Defined-benefit post-retirement benefit plans:
Change in the net actuarial gain/loss1,665 350 1,315 
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)1,239 260 979 
Total defined-benefit post-retirement benefit plans2,904 610 2,294 
Total other comprehensive income (loss)$517,789 $108,736 $409,053 
Before Tax
Amount		Tax Expense,
(Benefit)		Net of Tax
Amount
2024
Securities available for sale and transferred securities:
Change in net unrealized gain/loss during the period$(171,662)$(36,049)$(135,613)
Change in net unrealized gain on securities transferred to held to maturity(629)(132)(497)
Reclassification adjustment for net (gains) losses included in net income96 20 76 
Total securities available for sale and transferred securities(172,195)(36,161)(136,034)
Defined-benefit post-retirement benefit plans:
Change in the net actuarial gain/loss2,439 512 1,927 
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)1,673 351 1,322 
Total defined-benefit post-retirement benefit plans4,112 863 3,249 
Total other comprehensive income (loss)$(168,083)$(35,298)$(132,785)
2023
Securities available for sale and transferred securities:
Change in net unrealized gain/loss during the period$277,926 $58,364 $219,562 
Change in net unrealized gain on securities transferred to held to maturity(649)(136)(513)
Reclassification adjustment for net (gains) losses included in net income(66)(14)(52)
Total securities available for sale and transferred securities277,211 58,214 218,997 
Defined-benefit post-retirement benefit plans:
Change in the net actuarial gain/loss9,278 1,948 7,330 
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit)3,479 731 2,748 
Total defined-benefit post-retirement benefit plans12,757 2,679 10,078 
Total other comprehensive income (loss)$289,968 $60,893 $229,075 
Schedule of Accumulated Other Comprehensive Income, Net of Tax
Activity in accumulated other comprehensive income, net of tax, was as follows:
Securities
Available
For Sale		Defined
Benefit
Plans		Accumulated
Other
Comprehensive
Income
2025
Beginning balance$(1,230,828)$(21,176)$(1,252,004)
Other comprehensive income (loss) before reclassification406,088 1,315 407,403 
Reclassification of amounts included in net income671 979 1,650 
Net other comprehensive income (loss) during period406,759 2,294 409,053 
Ending balance$(824,069)$(18,882)$(842,951)
2024
Beginning balance$(1,094,794)$(24,425)$(1,119,219)
Other comprehensive income (loss) before reclassification(136,110)1,927 (134,183)
Reclassification of amounts included in net income76 1,322 1,398 
Net other comprehensive income (loss) during period(136,034)3,249 (132,785)
Ending balance$(1,230,828)$(21,176)$(1,252,004)
2023
Beginning balance$(1,313,791)$(34,503)$(1,348,294)
Other comprehensive income (loss) before reclassification219,049 7,330 226,379 
Reclassification of amounts included in net income(52)2,748 2,696 
Net other comprehensive income (loss) during period218,997 10,078 229,075 
Ending balance$(1,094,794)$(24,425)$(1,119,219)