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Retirement Plans
 9 Months Ended
Sep. 30, 2017
Defined Benefit Plan [Abstract]  
Retirement Plans Retirement Plans
The Corporation has a noncontributory defined benefit retirement plan (the Retirement Account Plan (“RAP”)) covering substantially all employees who meet participation requirements. The benefits are based primarily on years of service and the employee’s compensation paid. Employees of acquired entities generally participate in the RAP after consummation of the business combinations. Any retirement plans of acquired entities are typically merged into the RAP after completion of the mergers, and credit is usually given to employees for years of service at the acquired institution for vesting and eligibility purposes.
The Corporation also provides legacy healthcare access to a limited group of retired employees from a previous acquisition in the Postretirement Plan.  There are no other active retiree healthcare plans.
The components of net periodic benefit cost for the RAP and Postretirement Plan for three and nine months ended September 30, 2017 and 2016 were as follows.
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
 
($ in Thousands)
Components of Net Periodic Benefit Cost
 
 
 
 
 
 
 
RAP
 
 
 
 
 
 
 
Service cost
$
1,713

 
$
1,636

 
$
5,276

 
$
5,086

Interest cost
1,795

 
1,781

 
5,307

 
5,341

Expected return on plan assets
(4,929
)
 
(5,085
)
 
(14,692
)
 
(15,215
)
Amortization of prior service cost
(19
)
 
(80
)
 
(56
)
 
(55
)
Amortization of actuarial loss
619

 
621

 
1,594

 
1,586

Total net pension cost
$
(821
)
 
$
(1,127
)
 
$
(2,571
)
 
$
(3,257
)
Postretirement Plan
 
 
 
 
 
 
 
Interest cost
$
26

 
$
35

 
$
74

 
$
107

Amortization of prior service cost
(19
)
 
—

 
(57
)
 
—

Amortization of actuarial loss
2

 
—

 
2

 
—

Total net periodic benefit cost
$
9

 
$
35

 
$
19

 
$
107


The Corporation’s funding policy is to pay at least the minimum amount required by federal law and regulations, with consideration given to the maximum funding amounts allowed. The Corporation regularly reviews the funding of its RAP. The Corporation made contributions of $6 million to its RAP in the first nine months of 2017. No contribution was made during the first nine months of 2016.