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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 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 months ended March 31, 2015 and 2014, the components of net periodic benefit cost are as follows:
| Three months ended March 31
(Dollars in thousands) | 2015 |  | 2014
Service cost | $ | 3,600 |  |  | $ | 3,381 |
Interest cost | 6,748 |  |  | 6,556 |
Expected return on assets | (8,295 | ) |  | (7,812 | )
Amortization of prior service cost | 53 |  |  | 53 |
Amortization of net actuarial loss | 2,833 |  |  | 1,546 |
Net periodic benefit cost | $ | 4,939 |  |  | $ | 3,724 |
Bancorporation Plan For the three months ended March 31, 2015, the components of net periodic benefit cost are as follows:
| Three months ended March 31
(Dollars in thousands) | 2015
Service cost | $ | 933 |
Interest cost | 1,628 |
Expected return on assets | (2,869 | )
Amortization of prior service cost | — |
Amortization of net actuarial loss | — |
Net periodic benefit cost | $ | (308 | )
No contributions were made during the three months ended March 31, 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 the remainder of 2015.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 + Details
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