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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement of Comprehensive Income [Abstract]      
Net Income $ 301,662 $ 294,191 $ 284,184
Other Comprehensive Income (Loss):      
Unrealized Gain (Loss) on Available-for-Sale Securities, net of tax (expense) benefit of $(128), $(51) and $115 386 192 (432)
Unrealized Gain (Loss) on Pension and Other Postretirement Benefit Plans, net of tax (expense) benefit of $352, $(14) and $(2,769) (1,002) 41 7,871
Total Other Comprehensive Income (Loss) (616) 233 7,439
Total Comprehensive Income $ 301,046 $ 294,424 $ 291,623