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Acquired Loans Part 6 (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | $ 8,017 |  | $ 6,498 |
Past Due Greater Than 90 Days | 9,000 | [1] | 5,687 | [1]
Total Past Due | 17,017 |  | 12,185 |
Nonaccrual | 953 | [2] | 491 | [2]
Current Loans | 129,643 |  | 68,491 |
Acquired loans | 147,613 |  | 81,167 |
Covered [Member] |  |  |  |
Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | 4,566 |  | 6,272 |
Past Due Greater Than 90 Days | 5,199 | [1] | 5,685 | [1]
Total Past Due | 9,765 |  | 11,957 |
Nonaccrual | 733 | [2] | 491 | [2]
Current Loans | 54,005 |  | 64,356 |
Acquired loans | 64,503 |  | 76,804 |
Noncovered [Member] |  |  |  |
Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | 3,451 |  | 226 | [3]
Past Due Greater Than 90 Days | 3,801 | [1] | 2 | [1],[3]
Total Past Due | 7,252 |  | 228 | [3]
Nonaccrual | 220 | [2] | 0 | [2],[3]
Current Loans | 75,638 |  | 4,135 | [3]
Acquired loans | 83,110 |  | 4,363 | [3]
Real Estate Secured Financing Receivable [Member] | Construction Land Development And Other Financing Receivable [Member] | Covered [Member] |  |  |  |
Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | 257 |  | 253 |
Past Due Greater Than 90 Days | 242 | [1] | 1,004 | [1]
Total Past Due | 499 |  | 1,257 |
Nonaccrual | 445 | [2] | 386 | [2]
Current Loans | 2,770 |  | 2,566 |
Acquired loans | 3,714 |  | 4,209 |
Real Estate Secured Financing Receivable [Member] | Construction Land Development And Other Financing Receivable [Member] | Noncovered [Member] |  |  |  |
Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | 2,181 |  | 0 | [3]
Past Due Greater Than 90 Days | 1,487 | [1] | 0 | [1],[3]
Total Past Due | 3,668 |  | 0 | [3]
Nonaccrual | 0 | [2] | 0 | [2],[3]
Current Loans | 7,836 |  | 0 | [3]
Acquired loans | 11,504 |  | 0 | [3]
Real Estate Secured Financing Receivable [Member] | Residential Financing Receivable [Member] | Covered [Member] |  |  |  |
Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | 1,936 |  | 1,339 |
Past Due Greater Than 90 Days | 1,379 | [1] | 2,159 | [1]
Total Past Due | 3,315 |  | 3,498 |
Nonaccrual | 237 | [2] | 92 | [2]
Current Loans | 21,397 |  | 28,284 |
Acquired loans | 24,949 |  | 31,874 |
Real Estate Secured Financing Receivable [Member] | Residential Financing Receivable [Member] | Noncovered [Member] |  |  |  |
Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | 435 |  | 5 | [3]
Past Due Greater Than 90 Days | 1,325 | [1] | 0 | [1],[3]
Total Past Due | 1,760 |  | 5 | [3]
Nonaccrual | 61 | [2] | 0 | [2],[3]
Current Loans | 16,211 |  | 71 | [3]
Acquired loans | 18,032 |  | 76 | [3]
Real Estate Secured Financing Receivable [Member] | Nonresidential Properties Financing Receivables [Member] | Covered [Member] |  |  |  |
Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | 1,603 |  | 4,464 |
Past Due Greater Than 90 Days | 3,514 | [1] | 2,463 | [1]
Total Past Due | 5,117 |  | 6,927 |
Nonaccrual | 0 | [2] | 0 | [2]
Current Loans | 23,174 |  | 23,962 |
Acquired loans | 28,291 |  | 30,889 |
Real Estate Secured Financing Receivable [Member] | Nonresidential Properties Financing Receivables [Member] | Noncovered [Member] |  |  |  |
Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | 661 |  | 0 | [3]
Past Due Greater Than 90 Days | 951 | [1] | 0 | [1],[3]
Total Past Due | 1,612 |  | 0 | [3]
Nonaccrual | 159 | [2] | 0 | [2],[3]
Current Loans | 45,343 |  | 0 | [3]
Acquired loans | 47,114 |  | 0 | [3]
Real Estate Secured Financing Receivable [Member] | Other Real Estate Secured Financing Receivable [Member] | Covered [Member] |  |  |  |
Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | 189 |  | 176 |
Past Due Greater Than 90 Days | 64 | [1] | 14 | [1]
Total Past Due | 253 |  | 190 |
Nonaccrual | 10 | [2] | 0 | [2]
Current Loans | 3,935 |  | 4,936 |
Acquired loans | 4,198 |  | 5,126 |
Real Estate Secured Financing Receivable [Member] | Other Real Estate Secured Financing Receivable [Member] | Noncovered [Member] |  |  |  |
Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | 29 |  | 0 | [3]
Past Due Greater Than 90 Days | 0 | [1] | 0 | [1],[3]
Total Past Due | 29 |  | 0 | [3]
Nonaccrual | 0 | [2] | 0 | [2],[3]
Current Loans | 349 |  | 0 | [3]
Acquired loans | 378 |  | 0 | [3]
Commercial And Industrial Loans Financing Receivable [Member] | Covered [Member] |  |  |  |
Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | 152 |  | 37 |
Past Due Greater Than 90 Days | 0 | [1] | 45 | [1]
Total Past Due | 152 |  | 82 |
Nonaccrual | 41 | [2] | 13 | [2]
Current Loans | 1,610 |  | 2,876 |
Acquired loans | 1,803 |  | 2,971 |
Commercial And Industrial Loans Financing Receivable [Member] | Noncovered [Member] |  |  |  |
Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | 65 |  | 19 | [3]
Past Due Greater Than 90 Days | 17 | [1] | 0 | [1],[3]
Total Past Due | 82 |  | 19 | [3]
Nonaccrual | 0 | [2] | 0 | [2],[3]
Current Loans | 3,289 |  | 50 | [3]
Acquired loans | 3,371 |  | 69 | [3]
Consumer Loans Financing Receivable [Member] | Covered [Member] |  |  |  |
Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | 0 |  | 0 |
Past Due Greater Than 90 Days | 0 | [1] | 0 | [1]
Total Past Due | 0 |  | 0 |
Nonaccrual | 0 | [2] | 0 | [2]
Current Loans | 172 |  | 290 |
Acquired loans | 172 |  | 290 |
Consumer Loans Financing Receivable [Member] | Noncovered [Member] |  |  |  |
Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | 80 |  | 202 | [3]
Past Due Greater Than 90 Days | 21 | [1] | 2 | [1],[3]
Total Past Due | 101 |  | 204 | [3]
Nonaccrual | 0 | [2] | 0 | [2],[3]
Current Loans | 2,474 |  | 3,942 | [3]
Acquired loans | 2,575 |  | 4,146 | [3]
Other Loans Financing Receivable [Member] | Covered [Member] |  |  |  |
Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | 429 |  | 3 |
Past Due Greater Than 90 Days | 0 | [1] | 0 | [1]
Total Past Due | 429 |  | 3 |
Nonaccrual | 0 | [2] | 0 | [2]
Current Loans | 947 |  | 1,442 |
Acquired loans | 1,376 |  | 1,445 |
Other Loans Financing Receivable [Member] | Noncovered [Member] |  |  |  |
Acquired Loans, Aging [Abstract] |  |  |  |
Past Due 30 - 89 Days | 0 |  | 0 | [3]
Past Due Greater Than 90 Days | 0 | [1] | 0 | [1],[3]
Total Past Due | 0 |  | 0 | [3]
Nonaccrual | 0 | [2] | 0 | [2],[3]
Current Loans | 136 |  | 72 | [3]
Acquired loans | $ 136 |  | $ 72 | [3]
[1] | Past due greater than 90 days but still accruing interest.
[2] | Acquired loans not accounted for under FASB ASC Topic 310-30.
[3] | Acquired noncovered loans were included in LHFI at December 31, 2011.

X
- Definition Acquired loans that are less than 90 days past due but more than 29 days past due. + References No definition available. + Details
Name: | trmk_AcquiredLoans30To89DaysPastDue
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | trmk_AcquiredLoansAgingAbstract
Namespace Prefix: | trmk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying value of acquired consumer loans during the period. + References No definition available. + Details
Name: | trmk_AcquiredLoansCarryingValueConsumerLoans
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying value of acquired loans considered as past due. + References No definition available. + Details
Name: | trmk_AcquiredLoansCarryingValueTotalPastDue
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Acquired loans more than 90 days past due. + References No definition available. + Details
Name: | trmk_AcquiredLoansMoreThan90DaysPastDue
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Acquired loans that are on nonaccrual status as of the balance sheet date. + References No definition available. + Details
Name: | trmk_AcquiredLoansNonaccrualStatus
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Acquired loans that are current. + References No definition available. + Details
Name: | trmk_AcquiredLoansRecordedInvestmentCurrent
Namespace Prefix: | trmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant