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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015 and 2014:
 
SERP
 
Other Postretirement
Benefits
  
2015
 
2014
 
2015
 
2014
Benefit obligations:
  

 
  

 
  

 
  
Beginning of year
$
10,834

 
$
9,927

 
$
2,997

 
$
3,094

Service cost
307

 
270

 
62

 
45

Interest cost
424

 
456

 
117

 
132

Actuarial (gain) loss
(32
)
 
777

 
92

 
(134
)
Business combinations(1)
—

 
—

 
312

 
—

Benefits paid
(481
)
 
(596
)
 
(133
)
 
(140
)
End of year
11,052

 
10,834

 
3,447

 
2,997

Fair value of plan assets:
 
 
 
 
 
 
 
Beginning of year
—

 
—

 
—

 
—

Employer contributions
481

 
596

 
133

 
140

Benefits paid
(481
)
 
(596
)
 
(133
)
 
(140
)
End of year
—

 
—

 
—

 
—

Funded status at end of year(2)
$
11,052

 
$
10,834

 
$
3,447

 
$
2,997

Amounts recognized in AOCI, net of tax:
 
 
 
 
 
 
 
Net actuarial loss
$
1,789

 
$
1,953

 
$
423

 
$
378

Prior service cost (credit)
5

 
17

 
(170
)
 
(185
)
Total
$
1,794

 
$
1,970

 
$
253

 
$
193


(1)
In connection with the SBM acquisition, the Company assumed its post-retirement benefits for certain former employees and their spouses whereby the Company will cover 100% of healthcare premiums.
(2)
Reported 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 period benefit cost and other amounts recognized in OCI, before taxes, were as follows:
 
SERP
 
Other Postretirement
Benefits
  
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Net period benefit cost:
  

 
  

 
  

 
  

 
  

 
  

Service cost
$
307

 
$
270

 
$
326

 
$
62

 
$
45

 
$
42

Interest cost
424

 
456

 
377

 
117

 
132

 
173

Recognized net actuarial loss
218

 
140

 
224

 
24

 
10

 
48

Amortization of prior service cost (credit)
19

 
19

 
19

 
(22
)
 
(22
)
 
(23
)
Net period benefit cost
968

 
885

 
946

 
181

 
165

 
240

Changes in funded status recognized in OCI, before taxes:
  

 
  

 
  

 
 
 
 
 
 
Net actuarial (gain) loss
(32
)
 
777

 
(579
)
 
92

 
(134
)
 
(538
)
Reclassifications to net period benefit cost:
 
 
 
 
 
 
 
 
 
 
 
Amortization of net unrecognized actuarial loss
(218
)
 
(140
)
 
(224
)
 
(24
)
 
(10
)
 
(48
)
Amortization of prior service (cost) credit
(19
)
 
(19
)
 
(19
)
 
22

 
22

 
23

Total recognized in OCI, before taxes
(269
)
 
618

 
(822
)
 
90

 
(122
)
 
(563
)
Total recognized in net period benefit cost and OCI, before taxes
$
699

 
$
1,503

 
$
124

 
$
271

 
$
43

 
$
(323
)
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
  
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Weighted-average assumptions as of end of year:
  

 
  

 
  

 
  

 
  

 
  

Discount rate for benefit obligation
4.00
%
 
4.00
%
 
4.75
%
 
4.50
%
 
4.00
%
 
5.02
%
Discount rate for net period benefit cost
4.00
%
 
4.75
%
 
3.75
%
 
4.00
%
 
5.02
%
 
4.05
%
Rate of compensation increase for benefit obligation
4.00
%
 
4.00
%
 
4.50
%
 
—

 
—

 
—

Rate of compensation increase for net periodic benefit cost
4.00
%
 
4.50
%
 
4.50
%
 
—

 
—

 
—

Health care cost trend rate assumed for future years
—

 
—

 
—

 
7.00
%
 
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
2016
$
489

 
$
163

2017
473

 
160

2018
473

 
165

2019
477

 
169

2020
476

 
173

2021-2025
2,809

 
1,027