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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2022
Pension [Member]  
Components of Net Periodic Pension Plan Cost

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Nine Months Ended

​

Three Months Ended

Pension Plan

​

September 30,

​

September 30,

(in thousands)

    

2022

    

2021

    

2022

    

2021

Service cost

​

$

42

​

$

117

​

$

14

​

$

39

Interest cost

​

​

1,152

​

​

1,066

​

​

384

​

​

355

Expected return on assets

​

​

(2,858)

​

​

(2,677)

​

​

(953)

​

​

(892)

Amortization of net actuarial loss

​

​

837

​

​

1,116

​

​

279

​

​

372

Net pension credit included in employee benefits and other expense

​

$

(827)

​

$

(378)

​

$

(276)

​

$

(126)

SERP [Member]  
Components of Net Periodic Pension Plan Cost

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Nine Months Ended

​

Three Months Ended

Defined Benefit SERP

​

September 30,

​

September 30,

(in thousands)

    

2022

    

2021

    

2022

    

2021

Service cost

​

$

124

​

$

104

​

$

41

​

$

35

Interest cost

​

​

215

​

​

179

​

​

72

​

​

60

Amortization of recognized loss

​

​

203

​

​

226

​

​

68

​

​

75

Amortization of prior service cost

​

​

—

​

​

(1)

​

​

—

​

​

—

Net Defined Benefit SERP expense included in employee benefits and other expense

​

$

542

​

$

508

​

$

181

​

$

170