EMPLOYEE BENEFIT PLANS - Fair value of pension plan assets by asset category (Details) - Defined Benefit Plan - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
EMPLOYEE BENEFIT PLANS
Market value of assets	$ 16,260	$ 15,886	$ 15,155
Level 2
EMPLOYEE BENEFIT PLANS
Market value of assets	16,260	15,886
Level 3
EMPLOYEE BENEFIT PLANS
Market value of assets	0	0
Equity Income Separate Account-Z
EMPLOYEE BENEFIT PLANS
Market value of assets	834	775
Equity Income Separate Account-Z | Level 2
EMPLOYEE BENEFIT PLANS
Market value of assets	834	775
LargeCap S&P 500 Index Separate Account-Z
EMPLOYEE BENEFIT PLANS
Market value of assets	3,245	3,229
LargeCap S&P 500 Index Separate Account-Z | Level 2
EMPLOYEE BENEFIT PLANS
Market value of assets	3,245	3,229
Blue Chip Separate Account-Z
EMPLOYEE BENEFIT PLANS
Market value of assets	782	816
Blue Chip Separate Account-Z | Level 2
EMPLOYEE BENEFIT PLANS
Market value of assets	782	816
MidCap S&P 400 Index Separate Account-Z
EMPLOYEE BENEFIT PLANS
Market value of assets	1,961	1,907
MidCap S&P 400 Index Separate Account-Z | Level 2
EMPLOYEE BENEFIT PLANS
Market value of assets	1,961	1,907
SmallCap S&P 600 Index Separate Account-Z
EMPLOYEE BENEFIT PLANS
Market value of assets	1,643	1,602
SmallCap S&P 600 Index Separate Account-Z | Level 2
EMPLOYEE BENEFIT PLANS
Market value of assets	1,643	1,602
Global Emerging Markets Separate Account-Z
EMPLOYEE BENEFIT PLANS
Market value of assets	814	734
Global Emerging Markets Separate Account-Z | Level 2
EMPLOYEE BENEFIT PLANS
Market value of assets	814	734
Real Estate Securities Sep Acct Z
EMPLOYEE BENEFIT PLANS
Market value of assets	478	456
Real Estate Securities Sep Acct Z | Level 2
EMPLOYEE BENEFIT PLANS
Market value of assets	478	456
LDI Short Duration Separate Account-Z
EMPLOYEE BENEFIT PLANS
Market value of assets	1,605	1,603
LDI Short Duration Separate Account-Z | Level 2
EMPLOYEE BENEFIT PLANS
Market value of assets	1,605	1,603
Core Fixed Income Separate Account-Z
EMPLOYEE BENEFIT PLANS
Market value of assets	1,602	1,564
Core Fixed Income Separate Account-Z | Level 2
EMPLOYEE BENEFIT PLANS
Market value of assets	1,602	1,564
Core Plus Bond Separate Account-Z
EMPLOYEE BENEFIT PLANS
Market value of assets	1,612	1,571
Core Plus Bond Separate Account-Z | Level 2
EMPLOYEE BENEFIT PLANS
Market value of assets	1,612	1,571
Inflation Protection Separate Account-Z 3-BlackRock
EMPLOYEE BENEFIT PLANS
Market value of assets	797	777
Inflation Protection Separate Account-Z 3-BlackRock | Level 2
EMPLOYEE BENEFIT PLANS
Market value of assets	797	777
High Yield Sep Acct Z
EMPLOYEE BENEFIT PLANS
Market value of assets	810	798
High Yield Sep Acct Z | Level 2
EMPLOYEE BENEFIT PLANS
Market value of assets	810	798
Liquid Asset Separate Account-Z
EMPLOYEE BENEFIT PLANS
Market value of assets	77	54
Liquid Asset Separate Account-Z | Level 2
EMPLOYEE BENEFIT PLANS
Market value of assets	$ 77	$ 54