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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net Income $ 95,851 $ 86,847 $ 82,345
Unrealized Gain (Loss) on Available-for-Sale Securities:      
Reversal of Previously Recognized Losses (Gains) Realized on Sale of Investments and Included in Other Income During Period 13 16 (105)
Unrealized Gains (Losses) Arising During Period 184 147 (61)
Income Tax (Expense) Benefit (42) (34) 35
Available-for-Sale Securities, net of tax 155 129 (131)
Pension and Postretirement Benefit Plans:      
Actuarial (Losses) Gains net of Regulatory Allocation Adjustment (3,571) (2,779) 1,919
Amortization of Unrecognized Postretirement Benefit Losses and Costs 550 565 985
Income Tax Benefit (Expense) 796 576 (755)
Adjustment to Income Tax Expense Related to 2017 Tax Cuts and Jobs Act 0 0 (531)
Pension and Postretirement Benefit Plan, net of tax (2,225) (1,638) 1,618
Total Other Comprehensive Income (Loss) (2,070) (1,509) 1,487
Total Comprehensive Income $ 93,781 $ 85,338 $ 83,832