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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Compensation and Retirement Disclosure [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, 2017 and 2016:
 
SERP
 
Other Postretirement
Benefits
  
2017
 
2016
 
2017
 
2016
Benefit obligations:
  

 
  

 
  

 
  
Beginning of year
$
11,523

 
$
11,052

 
$
3,635

 
$
3,447

Service cost
335

 
308

 
53

 
59

Interest cost
452

 
432

 
144

 
151

Actuarial loss
1,955

 
219

 
110

 
143

Benefits paid
(475
)
 
(488
)
 
(151
)
 
(165
)
End of year
13,790

 
11,523

 
3,791

 
3,635

Fair value of plan assets:
 
 
 
 
 
 
 
Beginning of year
—

 
—

 
—

 
—

Employer contributions
475

 
488

 
151

 
165

Benefits paid
(475
)
 
(488
)
 
(151
)
 
(165
)
End of year
—

 
—

 
—

 
—

Unfunded status at end of year(1)
$
13,790

 
$
11,523

 
$
3,791

 
$
3,635

Amounts recognized in AOCI, net of tax:
 
 
 
 
 
 
 
Net actuarial loss
$
3,504

 
$
1,791

 
$
654

 
$
495

Prior service credit
—

 
—

 
(170
)
 
(156
)
Total
$
3,504

 
$
1,791

 
$
484

 
$
339


(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:
 
SERP
 
Other Postretirement
Benefits
  
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Net periodic benefit cost:
  

 
  

 
  

 
  

 
  

 
  

Service cost
$
335

 
$
308

 
$
307

 
$
53

 
$
59

 
$
62

Interest cost
452

 
432

 
424

 
144

 
151

 
117

Recognized net actuarial loss
246

 
220

 
218

 
41

 
30

 
24

Amortization of prior service cost (credit)
—

 
7

 
19

 
(24
)
 
(22
)
 
(22
)
Net periodic benefit cost
1,033

 
967

 
968

 
214

 
218

 
181

Changes in funded status recognized in OCI, before taxes:
  

 
  

 
  

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

 
219

 
(32
)
 
110

 
143

 
92

Reclassifications to net period benefit cost:
 
 
 
 
 
 
 
 
 
 
 
Amortization of net unrecognized actuarial loss
(246
)
 
(220
)
 
(218
)
 
(41
)
 
(30
)
 
(24
)
Amortization of prior service (cost) credit
—

 
(7
)
 
(19
)
 
24

 
22

 
22

Total recognized in OCI, before taxes
1,709

 
(8
)
 
(269
)
 
93

 
135

 
90

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

 
$
959

 
$
699

 
$
307

 
$
353

 
$
271
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
  
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Weighted-average assumptions as of end of year:
  

 
  

 
  

 
  

 
  

 
  

Discount rate for benefit obligation
3.60
%
 
4.00
%
 
4.00
%
 
3.55
%
 
4.00
%
 
4.50
%
Discount rate for net periodic benefit cost
4.00
%
 
4.00
%
 
4.00
%
 
4.00
%
 
4.50
%
 
4.00
%
Rate of compensation increase for benefit obligation
5.00
%
 
4.00
%
 
4.00
%
 
—

 
—

 
—

Rate of compensation increase for net periodic benefit cost
5.00
%
 
4.00
%
 
4.00
%
 
—

 
—

 
—

Health care cost trend rate assumed for future years
—

 
—

 
—

 
6.50
%
 
7.00
%
 
7.00
%
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
2018
473

 
156

2019
477

 
168

2020
486

 
173

2021
536

 
175

2022
566

 
187

2023-2027
2,246

 
1,061