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Defined Benefit and Other Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2012
Defined Benefit and Other Postretirement Benefits [Abstract] |
Net periodic benefit Cost | The following table presents information regarding the plan's net periodic benefit cost for the periods presented ($ in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 134 |  |  | $ | 124 |  |  | $ | 413 |  |  | $ | 398 |
Interest cost |  |  | 947 |  |  |  | 1,115 |  |  |  | 2,837 |  |  |  | 3,345 |
Expected return on plan assets |  |  | (1,438 | ) |  |  | (1,470 | ) |  |  | (4,238 | ) |  |  | (4,412 | )
Recognized net actuarial loss |  |  | 1,303 |  |  |  | 1,026 |  |  |  | 3,921 |  |  |  | 3,100 |
Net periodic benefit cost |  | $ | 946 |  |  | $ | 795 |  |  | $ | 2,933 |  |  | $ | 2,431 |
Trustmark maintains a nonqualified supplemental retirement plan covering directors who elected to defer fees, key executive officers and senior officers. The plan provides for defined death benefits and/or retirement benefits based on a participant's covered salary. Trustmark has acquired life insurance contracts on the participants covered under the plan, which may be used to fund future payments under the plan. The measurement date for the plan is December 31. The following table presents information regarding the plan's net periodic benefit cost for the periods presented ($ in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 170 |  |  | $ | 147 |  |  | $ | 510 |  |  | $ | 441 |
Interest cost |  |  | 517 |  |  |  | 569 |  |  |  | 1,550 |  |  |  | 1,707 |
Amortization of prior service cost |  |  | 63 |  |  |  | 59 |  |  |  | 188 |  |  |  | 177 |
Recognized net actuarial loss |  |  | 215 |  |  |  | 124 |  |  |  | 645 |  |  |  | 372 |
Net periodic benefit cost |  | $ | 965 |  |  | $ | 899 |  |  | $ | 2,893 |  |  | $ | 2,697 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 4, 7, 16, 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5, 6, 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: 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=6962843&loc=d3e2410-114920 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6930749&loc=d3e4179-114921 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2439-114920 + Details
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