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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits, Description [Abstract] |
Employee Benefit Plans | EMPLOYEE BENEFIT PLANS BancShares sponsors noncontributory defined benefit pension plans for its qualifying employees (BancShares Plan) and former First Citizens Bancorporation, Inc. employees (Bancorporation Plan). The service cost component of net periodic benefit cost is included in salaries and wages while all other non-service cost components are included in other noninterest expense. BancShares Plan For the three and six months ended June 30, 2018 and 2017, the components of net periodic benefit cost are as follows:
| Three months ended June 30 |  | Six months ended June 30
(Dollars in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 3,362 |  |  | $ | 2,934 |  |  | $ | 6,791 |  |  | $ | 6,310 |
Interest cost | 7,131 |  |  | 7,069 |  |  | 14,188 |  |  | 14,449 |
Expected return on assets | (11,976 | ) |  | (10,307 | ) |  | (23,933 | ) |  | (21,005 | )
Amortization of prior service cost | 20 |  |  | 53 |  |  | 40 |  |  | 105 |
Amortization of net actuarial loss | 3,548 |  |  | 2,193 |  |  | 6,794 |  |  | 4,427 |
Net periodic benefit cost | $ | 2,085 |  |  | $ | 1,942 |  |  | $ | 3,880 |  |  | $ | 4,286 |
Bancorporation Plan For the three and six months ended June 30, 2018 and 2017, the components of net periodic benefit cost are as follows:
| Three months ended June 30 |  | Six months ended June 30
(Dollars in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 624 |  |  | $ | 670 |  |  | $ | 1,286 |  |  | $ | 1,341 |
Interest cost | 1,592 |  |  | 1,682 |  |  | 3,179 |  |  | 3,365 |
Expected return on assets | (3,110 | ) |  | (2,796 | ) |  | (6,216 | ) |  | (5,592 | )
Amortization of net actuarial loss | 86 |  |  | 214 |  |  | 157 |  |  | 428 |
Net periodic benefit cost | $ | (808 | ) |  | $ | (230 | ) |  | $ | (1,594 | ) |  | $ | (458 | )
No contributions were made during the three and six months ended June 30, 2018 to the BancShares or Bancorporation pension plans. We anticipate making a $50.0 million contribution to the BancShares plan during 2018.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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