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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2016
BancShares Plan  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs
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  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs
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
)