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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2012
Shareholders' Equity [Abstract] |
Table of actual regulatory capital amounts and ratios | Trustmark's and TNB's actual regulatory capital amounts and ratios are presented in the table below ($ in thousands):
|  |  |  |  |  |  |  | Minimum Regulatory |
|  | Actual |  |  | Minimum Regulatory |  |  | Provision to be |
|  | Regulatory Capital |  |  | Capital Required |  |  | Well-Capitalized |
|  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
At September 30, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 1,153,101 |  |  |  | 17.25 | % |  | $ | 534,786 |  |  |  | 8.00 | % |  |  | n/a |  |  |  | n/a |
Trustmark National Bank |  |  | 1,113,636 |  |  |  | 16.85 | % |  |  | 528,689 |  |  |  | 8.00 | % |  | $ | 660,861 |  |  |  | 10.00 | %
Tier 1 Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 1,029,598 |  |  |  | 15.40 | % |  | $ | 267,393 |  |  |  | 4.00 | % |  |  | n/a |  |  |  | n/a |
Trustmark National Bank |  |  | 992,978 |  |  |  | 15.03 | % |  |  | 264,344 |  |  |  | 4.00 | % |  | $ | 396,516 |  |  |  | 6.00 | %
Tier 1 Capital (to Average Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 1,029,598 |  |  |  | 10.83 | % |  | $ | 285,306 |  |  |  | 3.00 | % |  |  | n/a |  |  |  | n/a |
Trustmark National Bank |  |  | 992,978 |  |  |  | 10.57 | % |  |  | 281,751 |  |  |  | 3.00 | % |  | $ | 469,585 |  |  |  | 5.00 | %
At December 31, 2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 1,096,213 |  |  |  | 16.67 | % |  | $ | 526,156 |  |  |  | 8.00 | % |  |  | n/a |  |  |  | n/a |
Trustmark National Bank |  |  | 1,057,932 |  |  |  | 16.28 | % |  |  | 519,709 |  |  |  | 8.00 | % |  | $ | 649,636 |  |  |  | 10.00 | %
Tier 1 Capital (to Risk Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 974,034 |  |  |  | 14.81 | % |  | $ | 263,078 |  |  |  | 4.00 | % |  |  | n/a |  |  |  | n/a |
Trustmark National Bank |  |  | 938,122 |  |  |  | 14.44 | % |  |  | 259,855 |  |  |  | 4.00 | % |  | $ | 389,782 |  |  |  | 6.00 | %
Tier 1 Capital (to Average Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trustmark Corporation |  | $ | 974,034 |  |  |  | 10.43 | % |  | $ | 280,162 |  |  |  | 3.00 | % |  |  | n/a |  |  |  | n/a |
Trustmark National Bank |  |  | 938,122 |  |  |  | 10.18 | % |  |  | 276,502 |  |  |  | 3.00 | % |  | $ | 460,837 |  |  |  | 5.00 | %
Components of accumulated other comprehensive income (loss) and the related tax effects | The following table presents the components of accumulated other comprehensive income and the related tax effects allocated to each component for the periods ended September 30, 2012 and 2011 ($ in thousands):
|  |  |  |  |  |  |  | Accumulated |
|  |  |  |  |  |  |  | Other |
|  | Before-Tax |  |  | Tax |  |  | Comprehensive |
|  | Amount |  |  | Effect |  |  | Income (Loss) |
Balance, January 1, 2012 |  | $ | 5,089 |  |  | $ | (1,968 | ) |  | $ | 3,121 |
Unrealized holding gains on AFS arising during period |  |  | 2,970 |  |  |  | (1,136 | ) |  |  | 1,834 |
Adjustment for net gains realized in net income |  |  | (1,041 | ) |  |  | 398 |  |  |  | (643 | )
Pension and other postretirement benefit plans |  |  | 4,755 |  |  |  | (1,819 | ) |  |  | 2,936 |
Balance, September 30, 2012 |  | $ | 11,773 |  |  | $ | (4,525 | ) |  | $ | 7,248 |
Balance, January 1, 2011 |  | $ | (18,469 | ) |  | $ | 7,043 |  |  | $ | (11,426 | )
Unrealized holding gains on AFS arising during period |  |  | 46,696 |  |  |  | (17,861 | ) |  |  | 28,835 |
Adjustment for net gains realized in net income |  |  | (91 | ) |  |  | 35 |  |  |  | (56 | )
Pension and other postretirement benefit plans |  |  | 3,649 |  |  |  | (1,396 | ) |  |  | 2,253 |
Balance, September 30, 2011 |  | $ | 31,785 |  |  | $ | (12,179 | ) |  | $ | 19,606 |

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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 715 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph (i) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=6918689&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=6918689&loc=SL5958577-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Chapter 17 -Paragraph 18 -IssueDate 2006-05-01 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -URI http://asc.fasb.org/extlink&oid=6918689&loc=d3e65071-112826 -Subparagraph (c)(2) Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6918689&loc=SL5958568-112826 + Details
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