v3.26.1
Components of Net Periodic Benefit Cost (Tables)
6 Months Ended
Jun. 30, 2026
Components of Net Periodic Benefit Cost  
Schedule of Net Periodic Benefit Costs

Three Months Ended June 30, 

Six Months Ended June 30, 

Post-Retirement

Post-Retirement

Pension Benefits

Health Benefits

Pension Benefits

Health Benefits

(Dollar amounts in thousands)

  ​ ​ ​

2026

  ​ ​ ​

2025

2026

  ​ ​ ​

2025

2026

  ​ ​ ​

2025

2026

  ​ ​ ​

2025

Service cost

$

104

$

107

$

6

$

3

$

208

$

215

$

11

$

6

Interest cost

 

990

 

1,017

 

38

 

32

 

1,980

 

2,033

 

75

 

64

Expected return on plan assets

 

(1,216)

 

(1,093)

 

 

 

(2,432)

 

(2,187)

 

 

Net amortization of prior service cost

 

 

 

 

 

 

 

 

Net amortization of net (gain) loss

(30)

(39)

(60)

(78)

Net Periodic Benefit Cost

$

(122)

$

31

$

14

$

(4)

$

(244)

$

61

$

26

$

(8)