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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Changes in Benefit Obligation and Plan Assets
The following table summarizes changes in the benefit obligation and plan assets for (i) SERP and (ii) the other postretirement benefit plan as of December 31:
 
SERP
 
Other Postretirement
Benefits
  
2018
 
2017
 
2018
 
2017
Benefit obligations:
  

 
  

 
  

 
  
Beginning of year
$
13,790

 
$
11,523

 
$
3,791

 
$
3,635

Service cost
446

 
335

 
46

 
53

Interest cost
488

 
452

 
132

 
144

Actuarial (gain) loss
(1,534
)
 
1,955

 
(209
)
 
110

Benefits paid
(473
)
 
(475
)
 
(144
)
 
(151
)
End of year
12,717

 
13,790

 
3,616

 
3,791

Fair value of plan assets:
 
 
 
 
 
 
 
Beginning of year
—

 
—

 
—

 
—

Employer contributions
473

 
475

 
144

 
151

Benefits paid
(473
)
 
(475
)
 
(144
)
 
(151
)
End of year
—

 
—

 
—

 
—

Unfunded status at end of year(1)
$
12,717

 
$
13,790

 
$
3,616

 
$
3,791

Amounts recognized in AOCI, net of tax:
 
 
 
 
 
 
 
Net actuarial loss
$
1,859

 
$
3,504

 
$
449

 
$
654

Prior service credit
—

 
—

 
(151
)
 
(170
)
Total
$
1,859

 
$
3,504

 
$
298

 
$
484


(1)
Presented within other liabilities on the consolidated statements of condition.
Schedule of Net Period Benefit Cost and Other Amounts Recognized in Other Comprehensive Income
The components of net periodic benefit cost and other amounts recognized in OCI, before taxes, were as follows for the year ended December 31:
 
SERP
 
Other Postretirement
Benefits
  
2018
 
2017
 
2016
 
2018
 
2017
 
2016
Net periodic benefit cost:
  

 
  

 
  

 
  

 
  

 
  

Service cost(1)
$
446

 
$
335

 
$
308

 
$
46

 
$
53

 
$
59

Interest cost(2)
488

 
452

 
432

 
132

 
144

 
151

Recognized net actuarial loss(2)
561

 
246

 
220

 
52

 
41

 
30

Amortization of prior service cost (credit)(2)
—

 
—

 
7

 
(24
)
 
(24
)
 
(22
)
Net periodic benefit cost
1,495

 
1,033

 
967

 
206

 
214

 
218

Changes in funded status recognized in OCI, before taxes:
  

 
  

 
  

 
 
 
 
 
 
Net actuarial (gain) loss arising during period
(1,534
)
 
1,955

 
219

 
(209
)
 
110

 
143

Reclassifications to net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
Amortization of net unrecognized actuarial loss
(561
)
 
(246
)
 
(220
)
 
(52
)
 
(41
)
 
(30
)
Amortization of prior service (cost) credit
—

 
—

 
(7
)
 
24

 
24

 
22

Total recognized in OCI, before taxes
(2,095
)
 
1,709

 
(8
)
 
(237
)
 
93

 
135

Total recognized in net periodic benefit cost and OCI, before taxes
$
(600
)
 
$
2,742

 
$
959

 
$
(31
)
 
$
307

 
$
353
Schedule of Assumptions Used in Determining Benefit Obligations and Net Period Benefit Costs
The following assumptions were used in determining benefit obligations and net period benefit costs:
 
SERP
 
Other Postretirement
Benefits
  
2018
 
2017
 
2016
 
2018
 
2017
 
2016
Weighted-average assumptions as of end of year:
  

 
  

 
  

 
  

 
  

 
  

Discount rate for benefit obligation
4.2
%
 
3.6
%
 
4.0
%
 
4.2
%
 
3.6
%
 
4.0
%
Discount rate for net periodic benefit cost
3.6
%
 
4.0
%
 
4.0
%
 
3.6
%
 
4.0
%
 
4.5
%
Rate of compensation increase for benefit obligation
3.0
%
 
5.0
%
 
4.0
%
 
—

 
—

 
—

Rate of compensation increase for net periodic benefit cost
3.0
%
 
5.0
%
 
4.0
%
 
—

 
—

 
—

Health care cost trend rate assumed for future years
—

 
—

 
—

 
6.0
%
 
6.5
%
 
7.0
%
Schedule of Estimated Future Benefit Payments
The expected benefit payments for the next ten years are presented in the following table:
 
SERP
 
Other Postretirement Benefits
2019
$
477

 
$
166

2020
486

 
175

2021
536

 
183

2022
566

 
191

2023
526

 
197

Next 5 years
2,149

 
1,102