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Employee Benefit Plans
 6 Months Ended
Jun. 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 six months ended June 30, 2016 and 2015, the components of net periodic benefit cost are as follows:
 
Three months ended June 30
 
Six months ended June 30
(Dollars in thousands)
2016
 
2015
 
2016
 
2015
Service cost
$
3,090

 
$
3,603

 
$
6,310

 
$
7,203

Interest cost
7,269

 
6,750

 
14,450

 
13,498

Expected return on assets
(9,167
)
 
(8,299
)
 
(18,326
)
 
(16,594
)
Amortization of prior service cost
52

 
52

 
104

 
105

Amortization of net actuarial loss
1,830

 
2,835

 
3,430

 
5,668

Net periodic benefit cost
$
3,074

 
$
4,941

 
$
5,968

 
$
9,880


Bancorporation Plan
For the three and six months ended June 30, 2016 and 2015, the components of net periodic benefit cost are as follows:
 
Three months ended June 30
 
Six months ended June 30
(Dollars in thousands)
2016
 
2015
 
2016
 
2015
Service cost
$
633

 
$
932

 
$
1,283

 
$
1,865

Interest cost
1,713

 
1,627

 
3,388

 
3,255

Expected return on assets
(2,771
)
 
(2,870
)
 
(5,550
)
 
(5,739
)
Net periodic benefit cost
$
(425
)
 
$
(311
)
 
$
(879
)
 
$
(619
)

No contributions were made during the three and six months ended June 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.