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Shareholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Securities available for sale and transferred securities, Before tax amount [Abstract] |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period, Before tax amount |  |  |  | $ (4,154) | $ 17,807 |
Reclassification adjustment for net gains realized in net income, Before tax amount |  |  |  | 0 | (389) |
Change in net unrealized holding loss on securities transferred to held to maturity, Before tax amount |  |  |  | 3,069 | 2,806 |
Total securities available for sale and transferred securities, Before tax amount |  |  |  | (1,085) | 20,224 |
Securities available for sale and transferred securities, Tax (expense) benefit [Abstract] |  |  |  |  |  |
Unrealized holding gains (losses) arising during the period, Tax Effect |  |  |  | 1,589 | (6,811) |
Reclassification adjustment for net gains realized in net income, Tax |  |  |  | 0 | 149 |
Change in net unrealized holding loss on securities transferred to held to maturity, Tax |  |  |  | (1,174) | (1,073) |
Total securities available for sale and transferred securities, Tax |  |  |  | 415 | (7,735) |
Securities available for sale and transferred securities, Net of tax amount [Abstract] |  |  |  |  |  |
Net unrealized holding gains (losses) on AFS Securities, net of tax at date of transfer |  | $ (13,951) | $ 6,767 | (2,565) | 10,996 |
Reclassification adjustment for net gains realized in net income, after tax income (expense) |  | 0 | 0 | 0 | (240) |
Change in net unrealized holding loss on securities transferred to held to maturity, after tax income (expense) |  | 1,021 | 910 | 1,895 | 1,733 |
Total securities available for sale and transferred securities, after tax income (expense) |  |  |  | (670) | 12,489 |
Pension and other postretirement benefit plans, Before tax amount [Abstract] |  |  |  |  |  |
Net change in prior service costs, before tax amount |  |  |  | 125 | 125 |
Recognized net loss due to lump sum settlements, before tax amount |  |  |  | 896 | 750 |
Change in net actuarial loss, before tax amount |  |  |  | 2,437 | 1,805 |
Total pension and other postretirement benefit plans, before tax amount |  |  |  | 3,458 | 2,680 |
Pension and other postretirement benefit plans, Tax (expense) benefit [Abstract] |  |  |  |  |  |
Net change in prior service costs, tax (expense) benefit |  |  |  | (48) | (48) |
Recognized net loss due to lump sum settlements, tax (expense) benefit |  |  |  | (343) | (287) |
Change in net actuarial loss, tax (expense) benefit |  |  |  | (932) | (690) |
Total pension and other postretirement benefit plans, tax (expense) benefit |  |  |  | (1,323) | (1,025) |
Pension and other postretirement benefit plans, Net of tax amount [Abstract] |  |  |  |  |  |
Net change in prior service costs, after tax income (expense) |  | 38 | 38 | 77 | 77 |
Recognized net loss due to lump sum settlements, after tax income (expense) |  | 296 | 231 | 553 | 463 |
Change in net actuarial loss, after tax income (expense) |  |  |  | 1,505 | 1,115 |
Total pension and other postretirement benefit plans, after tax income (expense) |  |  |  | 2,135 | 1,655 |
Cash Flow Hedge Derivatives, Before tax amount [Abstract] |  |  |  |  |  |
Change in accumulated gain (loss) on effective cash flow hedge derivatives, before tax amount |  |  |  | (703) | (1,571) |
Reclassification adjustment for loss realized in net income, before tax amount |  |  |  | 421 |  |
Total cash flow hedge derivatives, before tax benefit |  |  |  | (282) |  |
Cash Flow Hedge Derivatives, Tax (expense) benefit [Abstract] |  |  |  |  |  |
Change in accumulated gain (loss) on effective cash flow hedge derivatives, tax (expense) benefit |  |  |  | 269 | 601 |
Reclassification adjustment for loss realized in net income, tax (expense) benefit |  |  |  | (161) |  |
Total cash flow hedge derivatives, tax (expense) benefit |  |  |  | 108 |  |
Cash Flow Hedge Derivatives, Net of tax amount [Abstract] |  |  |  |  |  |
Change in the accumulated gain (loss) on effective cash flow hedge derivatives, after tax amount |  | 174 | (562) | (434) | (970) |
Reclassification adjustment for loss realized in net income, after tax amount |  | 130 | 0 | 260 | 0 |
Total cash flow hedge derivatives, after tax amount |  |  |  | (174) |  |
Total other comprehensive income, Before tax amount |  |  |  | 2,091 | 21,333 |
Total other comprehensive income, Tax expense (benefit) |  |  |  | (800) | (8,159) |
Total other comprehensive income, Net of tax |  |  |  | 1,291 | 13,174 |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Opening balance |  |  |  | (42,484) | (43,731) |
Other comprehensive income (loss) before reclassification |  |  |  | 1,031 | 13,414 |
Amounts reclassified from accumulated other comprehensive loss |  |  |  | 260 | (240) |
Net other comprehensive income (loss) |  | (11,541) | 7,940 | 1,291 | 13,174 |
Ending balance |  | (41,193) | (30,557) | (41,193) | (30,557) |
Trustmark Corporation [Member] | Common Equity Tier 1 Capital (to Risk Weighted Assets) [Member] |  |  |  |  |  |
Common Equity Tier One Risk Based Capital [Abstract] |  |  |  |  |  |
Actual Regulatory Capital Amount |  | $ 1,133,094 |  | $ 1,133,094 |  | $ 1,069,630
Actual Regulatory Capital Ratio (in hundredths) |  | 13.28% |  | 13.28% |  | 12.75%
Minimum Regulatory Capital Required Ratio (in hundredths) |  | 4.50% |  | 4.50% |  |
Minimum Regulatory Provision to be Well-Capitalized Ratio (in hundredths) | [1] |  |  |  |  |
Trustmark Corporation [Member] | Tier 1 Capital (to Risk Weighted Assets) [Member] |  |  |  |  |  |
Tier 1 Capital (to Risk Weighted Assets) [Abstract] |  |  |  |  |  |
Actual Regulatory Capital Amount |  | $ 1,191,523 |  | $ 1,191,523 |  | $ 1,129,630
Actual Regulatory Capital Ratio (in hundredths) |  | 13.97% |  | 13.97% |  | 13.47%
Minimum Regulatory Capital Required Ratio (in hundredths) |  | 6.00% |  | 6.00% |  | 4.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio (in hundredths) | [1] |  |  |  |  |
Trustmark Corporation [Member] | Total Capital (to Risk Weighted Assets) [Member] |  |  |  |  |  |
Total Capital (to Risk Weighted Assets) [Abstract] |  |  |  |  |  |
Actual Regulatory Capital Amount |  | $ 1,285,309 |  | $ 1,285,309 |  | $ 1,221,292
Actual Regulatory Capital Ratio (in hundredths) |  | 15.07% |  | 15.07% |  | 14.56%
Minimum Regulatory Capital Required Ratio (in hundredths) |  | 8.00% |  | 8.00% |  | 8.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio (in hundredths) | [1] |  |  |  |  |
Trustmark Corporation [Member] | Tier 1 Leverage (to Average Assets) [Member] |  |  |  |  |  |
Tier 1 Leverage (to Average Assets) [Abstract] |  |  |  |  |  |
Actual Regulatory Capital Amount |  | $ 1,191,523 |  | $ 1,191,523 |  | $ 1,129,630
Actual Regulatory Capital Ratio (in hundredths) |  | 10.14% |  | 10.14% |  | 9.63%
Minimum Regulatory Capital Required Ratio (in hundredths) |  | 4.00% |  | 4.00% |  | 4.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio (in hundredths) | [1] |  |  |  |  |
Trustmark National Bank [Member] | Common Equity Tier 1 Capital (to Risk Weighted Assets) [Member] |  |  |  |  |  |
Common Equity Tier One Risk Based Capital [Abstract] |  |  |  |  |  |
Actual Regulatory Capital Amount |  | $ 1,172,108 |  | $ 1,172,108 |  | $ 1,108,399
Actual Regulatory Capital Ratio (in hundredths) |  | 13.74% |  | 13.74% |  | 13.24%
Minimum Regulatory Capital Required Ratio (in hundredths) |  | 4.50% |  | 4.50% |  |
Minimum Regulatory Provision to be Well-Capitalized Ratio (in hundredths) |  | 6.50% |  | 6.50% |  |
Trustmark National Bank [Member] | Tier 1 Capital (to Risk Weighted Assets) [Member] |  |  |  |  |  |
Tier 1 Capital (to Risk Weighted Assets) [Abstract] |  |  |  |  |  |
Actual Regulatory Capital Amount |  | $ 1,172,108 |  | $ 1,172,108 |  | $ 1,108,399
Actual Regulatory Capital Ratio (in hundredths) |  | 13.74% |  | 13.74% |  | 13.24%
Minimum Regulatory Capital Required Ratio (in hundredths) |  | 6.00% |  | 6.00% |  | 4.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio (in hundredths) |  | 8.00% |  | 8.00% |  | 6.00%
Trustmark National Bank [Member] | Total Capital (to Risk Weighted Assets) [Member] |  |  |  |  |  |
Total Capital (to Risk Weighted Assets) [Abstract] |  |  |  |  |  |
Actual Regulatory Capital Amount |  | $ 1,265,894 |  | $ 1,265,894 |  | $ 1,198,697
Actual Regulatory Capital Ratio (in hundredths) |  | 14.84% |  | 14.84% |  | 14.32%
Minimum Regulatory Capital Required Ratio (in hundredths) |  | 8.00% |  | 8.00% |  | 8.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio (in hundredths) |  | 10.00% |  | 10.00% |  | 10.00%
Trustmark National Bank [Member] | Tier 1 Leverage (to Average Assets) [Member] |  |  |  |  |  |
Tier 1 Leverage (to Average Assets) [Abstract] |  |  |  |  |  |
Actual Regulatory Capital Amount |  | $ 1,172,108 |  | $ 1,172,108 |  | $ 1,108,399
Actual Regulatory Capital Ratio (in hundredths) |  | 9.99% |  | 9.99% |  | 9.46%
Minimum Regulatory Capital Required Ratio (in hundredths) |  | 4.00% |  | 4.00% |  | 4.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio (in hundredths) |  | 5.00% |  | 5.00% |  | 5.00%
Securities Available for Sale and Transferred Securities [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Opening balance |  |  |  | $ (11,003) | (25,462) |
Other comprehensive income (loss) before reclassification |  |  |  | (670) | 12,729 |
Amounts reclassified from accumulated other comprehensive loss |  |  |  | 0 | (240) |
Net other comprehensive income (loss) |  |  |  | (670) | 12,489 |
Ending balance |  | $ (11,673) | (12,973) | (11,673) | (12,973) |
Defined Benefit Pension Items [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Opening balance |  |  |  | (31,617) | (19,793) |
Other comprehensive income (loss) before reclassification |  |  |  | 2,135 | 1,655 |
Amounts reclassified from accumulated other comprehensive loss |  |  |  | 0 | 0 |
Net other comprehensive income (loss) |  |  |  | 2,135 | 1,655 |
Ending balance |  | (29,482) | (18,138) | (29,482) | (18,138) |
Cash Flow Hedge Derivatives [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Opening balance |  |  |  | 136 | 1,524 |
Other comprehensive income (loss) before reclassification |  |  |  | (434) | (970) |
Amounts reclassified from accumulated other comprehensive loss |  |  |  | 260 | 0 |
Net other comprehensive income (loss) |  |  |  | (174) | (970) |
Ending balance |  | $ (38) | $ 554 | $ (38) | $ 554 |
[1] | n/a

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- Definition The minimum Common Equity Tier One Capital Ratio (Common Equity Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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