Accounting Policies Recently Adopted and Pending Accounting Pronouncements	6 Months Ended
Jun. 30, 2013
Accounting Policies Recently Adopted and Pending Accounting Pronouncements [Abstract]
Accounting Policies Recently Adopted and Pending Accounting Pronouncements	Note 19 – Accounting Policies Recently Adopted and Pending Accounting Pronouncements ASU 2013-02, “Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” Issued in February 2013, ASU 2013-02 requires an entity to report the effect of significant reclassifications out of accumulated other comprehensive income on net income line items only for those items that are reported in their entirety in net income in the period of reclassification. For these items, entities are required to disclose the effect of the reclassification on each line item of net income that is affected by the reclassification adjustment. For items that are not reclassified in their entirety into net income, an entity is required to add a cross-reference to the note that includes additional information about the effect of the reclassification. For entities that only have reclassifications into net income in their entirety, this information may be presented either in the notes or parenthetically on the face of the statement that reports net income as long as the required information is reported in a single location. Entities that have one or more reclassification items that are not presented in their entirety in net income in the period of reclassification must present this information in the notes to the financial statements. ASU 2013-02 became effective for Trustmark’s financial statements on January 1, 2013, and the adoption did not have a significant impact to Trustmark’s consolidated financial statements. The required disclosures are reported in Note 15 – Shareholders’ Equity. ASU 2013-01. “Balance Sheet (Topic 210): Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities.” Issued in January 2013, ASU 2013-01 clarifies that the scope of ASU 2011-11, “Balance Sheet (Topic 210): Disclosures about Offsetting Assets and Liabilities,” applies to derivatives accounted for in accordance with FASB ASC Topic 815, including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions that are either offset in accordance with Section 210-20-45 or Section 815-10-45 or subject to an enforceable master netting arrangement or similar agreements. ASU 2013-01 became effective for Trustmark’s financial statements on January 1, 2013, and the adoption did not have a significant impact to Trustmark’s consolidated financial statements. The required disclosures are reported in Note 17 – Derivatives. ASU 2012-06, “Business Combinations (Topic 805): Subsequent Accounting for an Indemnification Asset Recognized at the Acquisition Date as a Result of a Government-Assisted Acquisition of a Financial Institution (a consensus of the FASB Emerging Issues Task Force).” Issued in October 2012, ASU 2012-06 addresses the diversity in practice about how to subsequently measure an indemnification asset recognized as a result of a government-assisted acquisition of a financial institution. The amendments in ASU 2012-06 require a reporting entity to subsequently account for a change in the measurement of the indemnification asset on the same basis as the change in the assets subject to indemnification. ASU 2012-06 further requires that any amortization of changes in value be limited to the lesser of the term of the indemnification agreement and the remaining life of the indemnified assets. The amendments in ASU 2012-06 are effective prospectively for fiscal years beginning on or after December 15, 2012, and, therefore, were effective for Trustmark’s consolidated financial statements as of January 1, 2013. The adoption of ASU 2012-06 did not have a significant impact on Trustmark’s consolidated financial statements. The required disclosures are reported in Note 8 – FDIC Indemnification Asset. ASU 2012-02, “Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment.” Issued in July 2012, ASU 2012-02 amends the guidance in ASC 350-30 on testing indefinite-lived intangible assets other than goodwill for impairment. Under the revised guidance, entities testing indefinite-lived intangible assets for impairment have the option of performing a qualitative assessment before calculating the fair value of the reporting unit (i.e., step 1 of the indefinite-lived intangible assets impairment test). If entities determine, on the basis of qualitative factors, that the fair value of the reporting unit is more likely than not less than the carrying amount, the two-step impairment test would be required. The ASU does not change how indefinite-lived intangible assets are calculated or assigned to reporting units, nor does it revise the requirement to test indefinite-lived intangible assets annually for impairment. In addition, the ASU does not amend the requirement to test indefinite-lived intangible assets for impairment between annual tests if events or circumstances warrant; however, it does revise the examples of events and circumstances that an entity should consider. The amendments of ASU 2012-02 are effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. ASU 2012-02 became effect for Trustmark as of January 1, 2013. As Trustmark does not have any indefinite-lived intangible assets other than goodwill, the adoption of ASU 2012-02 had no impact on Trustmark’s consolidated financial statements.

Note 19 – Accounting Policies Recently Adopted and Pending Accounting Pronouncements

ASU 2013-02, “Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income.” Issued in February 2013, ASU 2013-02 requires an entity to report the effect of significant reclassifications out of accumulated other comprehensive income on net income line items only for those items that are reported in their entirety in net income in the period of reclassification. For these items, entities are required to disclose the effect of the reclassification on each line item of net income that is affected by the reclassification adjustment. For items that are not reclassified in their entirety into net income, an entity is required to add a cross-reference to the note that includes additional information about the effect of the reclassification. For entities that only have reclassifications into net income in their entirety, this information may be presented either in the notes or parenthetically on the face of the statement that reports net income as long as the required information is reported in a single location. Entities that have one or more reclassification items that are not presented in their entirety in net income in the period of reclassification must present this information in the notes to the financial statements. ASU 2013-02 became effective for Trustmark’s financial statements on January 1, 2013, and the adoption did not have a significant impact to Trustmark’s consolidated financial statements. The required disclosures are reported in Note 15 – Shareholders’ Equity.

ASU 2013-01. “Balance Sheet (Topic 210): Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities.” Issued in January 2013, ASU 2013-01 clarifies that the scope of ASU 2011-11, “Balance Sheet (Topic 210): Disclosures about Offsetting Assets and Liabilities,” applies to derivatives accounted for in accordance with FASB ASC Topic 815, including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions that are either offset in accordance with Section 210-20-45 or Section 815-10-45 or subject to an enforceable master netting arrangement or similar agreements. ASU 2013-01 became effective for Trustmark’s financial statements on January 1, 2013, and the adoption did not have a significant impact to Trustmark’s consolidated financial statements. The required disclosures are reported in Note 17 – Derivatives.

ASU 2012-06, “Business Combinations (Topic 805): Subsequent Accounting for an Indemnification Asset Recognized at the Acquisition Date as a Result of a Government-Assisted Acquisition of a Financial Institution (a consensus of the FASB Emerging Issues Task Force).” Issued in October 2012, ASU 2012-06 addresses the diversity in practice about how to subsequently measure an indemnification asset recognized as a result of a government-assisted acquisition of a financial institution. The amendments in ASU 2012-06 require a reporting entity to subsequently account for a change in the measurement of the indemnification asset on the same basis as the change in the assets subject to indemnification. ASU 2012-06 further requires that any amortization of changes in value be limited to the lesser of the term of the indemnification agreement and the remaining life of the indemnified assets. The amendments in ASU 2012-06 are effective prospectively for fiscal years beginning on or after December 15, 2012, and, therefore, were effective for Trustmark’s consolidated financial statements as of January 1, 2013. The adoption of ASU 2012-06 did not have a significant impact on Trustmark’s consolidated financial statements. The required disclosures are reported in Note 8 – FDIC Indemnification Asset.

ASU 2012-02, “Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment.” Issued in July 2012, ASU 2012-02 amends the guidance in ASC 350-30 on testing indefinite-lived intangible assets other than goodwill for impairment. Under the revised guidance, entities testing indefinite-lived intangible assets for impairment have the option of performing a qualitative assessment before calculating the fair value of the reporting unit (i.e., step 1 of the indefinite-lived intangible assets impairment test). If entities determine, on the basis of qualitative factors, that the fair value of the reporting unit is more likely than not less than the carrying amount, the two-step impairment test would be required. The ASU does not change how indefinite-lived intangible assets are calculated or assigned to reporting units, nor does it revise the requirement to test indefinite-lived intangible assets annually for impairment. In addition, the ASU does not amend the requirement to test indefinite-lived intangible assets for impairment between annual tests if events or circumstances warrant; however, it does revise the examples of events and circumstances that an entity should consider. The amendments of ASU 2012-02 are effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. ASU 2012-02 became effect for Trustmark as of January 1, 2013. As Trustmark does not have any indefinite-lived intangible assets other than goodwill, the adoption of ASU 2012-02 had no impact on Trustmark’s consolidated financial statements.