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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2015
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, 2015 and 2014, the components of net periodic benefit cost are as follows:
| Three months ended September 30 |  | Nine months ended September 30
(Dollars in thousands) | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | 3,358 |  |  | $ | 3,081 |  |  | $ | 10,561 |  |  | $ | 9,247 |
Interest cost | 6,732 |  |  | 6,402 |  |  | 20,230 |  |  | 19,209 |
Expected return on assets | (8,302 | ) |  | (7,296 | ) |  | (24,896 | ) |  | (23,448 | )
Amortization of prior service cost | 53 |  |  | 53 |  |  | 158 |  |  | 158 |
Amortization of net actuarial loss | 2,863 |  |  | 769 |  |  | 8,531 |  |  | 3,861 |
Net periodic benefit cost | $ | 4,704 |  |  | $ | 3,009 |  |  | $ | 14,584 |  |  | $ | 9,027 |
Bancorporation Plan For the three and nine months ended September 30, 2015, the components of net periodic benefit cost are as follows:
| Three months ended September 30 |  | Nine months ended September 30
(Dollars in thousands) | 2015 |  | 2015
Service cost | $ | 641 |  |  | $ | 2,506 |
Interest cost | 1,540 |  |  | 4,795 |
Expected return on assets | (2,873 | ) |  | (8,612 | )
Amortization of prior service cost | — |  |  | — |
Amortization of net actuarial loss | — |  |  | — |
Net periodic benefit cost | $ | (692 | ) |  | $ | (1,311 | )
No contributions were made during the three and nine months ended September 30, 2015 to the BancShares or Bancorporation pension plans. BancShares does not expect to make any contributions to either of the defined benefit pension plans during 2015.

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