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Retirement Benefit Plans
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Retirement Benefit Plans Retirement Benefit Plans
Defined benefit pension and other postretirement benefits
The following table summarizes the components of net periodic benefit cost:
 
Three months ended June 30,
 
2019
 
2018
(In thousands)
Pension Plan
SERP
Other Benefits
 
Pension Plan
SERP
Other Benefits
Interest cost on benefit obligations
$
1,977

$
16

$
21

 
$
1,935

$
(21
)
$
19

Expected return on plan assets
(2,815
)
—

—

 
(3,180
)
—

—

Recognized net loss
1,430

3

(4
)
 
1,160

333

—

Net periodic benefit cost
$
592

$
19

$
17

 
$
(85
)
$
312

$
19


 
Six months ended June 30,
 
2019
 
2018
(In thousands)
Pension Plan
SERP
Other Benefits
 
Pension Plan
SERP
Other Benefits
Interest cost on benefit obligations
$
3,955

$
32

$
42

 
$
3,720

$
166

$
39

Expected return on plan assets
(5,630
)
—

—

 
(6,360
)
—

—

Recognized net loss
2,860

7

(8
)
 
2,320

458

—

Net periodic benefit cost
$
1,185

$
39

$
34

 
$
(320
)
$
624

$
39


The components of net periodic benefit cost, other than the service cost component, are included as a component of other expense reflected in non-interest expense in the consolidated income statement.