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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2016
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Employee Benefit Plans
EMPLOYEE BENEFIT PLANS
BancShares sponsors noncontributory defined benefit pension plans for its qualifying employees (BancShares Plan) and legacy Bancorporation employees (Bancorporation Plan). Net periodic benefit cost is a component of employee benefits expense.
BancShares Plan
For the three and nine months ended September 30, 2016 and 2015, the components of net periodic benefit cost are as follows:
 
Three months ended September 30
 
Nine months ended September 30
(Dollars in thousands)
2016
 
2015
 
2016
 
2015
Service cost
$
3,153

 
$
3,358

 
$
9,463

 
$
10,561

Interest cost
7,218

 
6,732

 
21,668

 
20,230

Expected return on assets
(9,155
)
 
(8,302
)
 
(27,481
)
 
(24,896
)
Amortization of prior service cost
54

 
53

 
158

 
158

Amortization of net actuarial loss
1,714

 
2,863

 
5,144

 
8,531

Net periodic benefit cost
$
2,984

 
$
4,704

 
$
8,952

 
$
14,584


Bancorporation Plan
For the three and nine months ended September 30, 2016 and 2015, the components of net periodic benefit cost are as follows:
 
Three months ended September 30
 
Nine months ended September 30
(Dollars in thousands)
2016
 
2015
 
2016
 
2015
Service cost
$
642

 
$
641

 
$
1,925

 
$
2,506

Interest cost
1,694

 
1,540

 
5,081

 
4,795

Expected return on assets
(2,775
)
 
(2,873
)
 
(8,325
)
 
(8,612
)
Net periodic benefit cost
$
(439
)
 
$
(692
)
 
$
(1,319
)
 
$
(1,311
)

No contributions were made during the three and nine months ended September 30, 2016 to the BancShares or Bancorporation pension plans. BancShares does not expect to make any contributions to either of the defined benefit pension plans during 2016.