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

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Six Months Ended

​

Three Months Ended

Pension Plan

​

June 30,

​

June 30,

(in thousands)

    

2022

    

2021

    

2022

    

2021

Service cost

​

$

28

​

$

78

​

$

14

​

$

39

Interest cost

​

​

768

​

​

711

​

​

384

​

​

355

Expected return on assets

​

​

(1,905)

​

​

(1,785)

​

​

(953)

​

​

(892)

Amortization of net actuarial loss

​

​

558

​

​

744

​

​

279

​

​

372

Net pension credit included in employee benefits and other expense

​

$

(551)

​

$

(252)

​

$

(276)

​

$

(126)

SERP [Member]  
Components of Net Periodic Pension Plan Cost

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Six Months Ended

​

Three Months Ended

Defined Benefit SERP

​

June 30,

​

June 30,

(in thousands)

    

2022

    

2021

    

2022

    

2021

Service cost

​

$

83

​

$

69

​

$

42

​

$

34

Interest cost

​

​

143

​

​

119

​

​

71

​

​

59

Amortization of recognized loss

​

​

135

​

​

151

​

​

67

​

​

76

Amortization of prior service cost

​

​

—

​

​

(1)

​

​

—

​

​

—

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

​

$

361

​

$

338

​

$

180

​

$

169