v3.26.3
FAIR VALUE (Tables)
 9 Months Ended
Sep. 30, 2026
Fair Value Disclosures [Abstract]  
Schedule of Cost and Fair Values of Assets and Liabilities The cost and fair values of Tri-State's marketable securities related to the executive benefit restoration plan trust are as follows (dollars in thousands):
September 30, 2026December 31, 2025
CostEstimated
Fair Value		CostEstimated
Fair Value
Executive benefit restoration plan trust$10,609 $10,395 $10,337 $10,360 
The cost and fair values of Tri-State's marketable securities related to the deferred compensation plans are as follows (dollars in thousands):
September 30, 2026December 31, 2025
CostEstimated
Fair Value		CostEstimated
Fair Value
Deferred compensation$654 $738 $597 $637 
The principal amounts and fair values of debt are as follows (dollars in thousands):
September 30, 2026December 31, 2025
Principal
Amount		Estimated
Fair Value		Principal
Amount		Estimated
Fair Value
Total long-term debt$2,937,156 $2,647,691 $3,188,697 $3,068,509