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EMPLOYEE BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Components of Net Period Benefit Cost
The components of net period benefit cost for the periods ended June 30, 2017 and 2016 were as follows:
Supplemental Executive Retirement Plan:
 
 
Three Months Ended 
 June 30,
 
Six Months Ended June 30,
Net periodic benefit cost
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
84

 
$
77

 
$
168

 
$
154

Interest cost
 
113

 
108

 
226

 
216

Recognized net actuarial loss
 
62

 
55

 
124

 
110

Recognized prior service cost
 
—

 
2

 
—

 
4

Net period benefit cost(1)
 
$
259

 
$
242

 
$
518

 
$
484

(1)
Presented within the consolidated statements of income within salaries and employee benefits.
 
Other Postretirement Benefit Plan:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
Net periodic benefit cost
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
13

 
$
15

 
$
26

 
$
30

Interest cost
 
36

 
38

 
72

 
76

Recognized net actuarial loss
 
10

 
8

 
20

 
16

Amortization of prior service credit
 
(6
)
 
(6
)
 
(12
)
 
(12
)
Net period benefit cost(1)
 
$
53

 
$
55

 
$
106

 
$
110

(1)
Presented within the consolidated statements of income within salaries and employee benefits.