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Borrowings, Long-term Debt Instruments (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 Loan | Dec. 31, 2013 Loan | Dec. 31, 2012
Long-Term Borrowings [Abstract] |  |  |
Long-term FHLB advance | $ 1,253,000 us-gaap_FederalHomeLoanBankAdvancesLongTerm | $ 8,458,000 us-gaap_FederalHomeLoanBankAdvancesLongTerm |
Subordinated notes | 49,936,000 us-gaap_SubordinatedDebt | 49,904,000 us-gaap_SubordinatedDebt |
Federal Home Loan Bank Advances [Member] | Fair Market Value Adjustment [Member] |  |  |
Long-Term Borrowings [Abstract] |  |  |
Long-term FHLB advance | 7,000 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_NonrecurringAdjustmentAxis = trmk_FairMarketValueAdjustmentMember | 412,000 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_NonrecurringAdjustmentAxis = trmk_FairMarketValueAdjustmentMember |
Federal Home Loan Bank Advances [Member] | Atlanta [Member] |  |  |
Long-Term Borrowings [Abstract] |  |  |
Number of outstanding long-term FHLB advances | 4 trmk_NumberOfOutstandingLongTermFhlbAdvances / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember | 6 trmk_NumberOfOutstandingLongTermFhlbAdvances / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember |
Long-term FHLB advance | 1,200,000 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember | 8,500,000 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember |
Weighted average remaining maturity | 7 years 1 month 17 days | 2 years 10 months 6 days |
Weighted average cost related to FHLB advances (in hundredths) | 1.11%trmk_WeightedAverageCostRelatedToFhlbAdvances / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember | 3.55%trmk_WeightedAverageCostRelatedToFhlbAdvances / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember |
Interest expense, long-term | 45,000 us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember | 57,000 us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember | 0 us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember
Federal Home Loan Bank Advances [Member] | Atlanta [Member] | Minimum [Member] |  |  |
Long-Term Borrowings [Abstract] |  |  |
Long-term FHLB advance | 23,000 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember | 30,000 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember |
Interest rate (in hundredths) | 0.08%us-gaap_DebtInstrumentInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember | 0.08%us-gaap_DebtInstrumentInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember |
Federal Home Loan Bank Advances [Member] | Atlanta [Member] | Maximum [Member] |  |  |
Long-Term Borrowings [Abstract] |  |  |
Long-term FHLB advance | 913,000 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember | 6,500,000 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember |
Interest rate (in hundredths) | 6.50%us-gaap_DebtInstrumentInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember | 6.95%us-gaap_DebtInstrumentInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember |
Subordinated Notes Payable [Member] |  |  |
Long-Term Borrowings [Abstract] |  |  |
Interest rate (in hundredths) | 5.673%us-gaap_DebtInstrumentInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember |  |
Face amount of debt issued | 50,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember |  |
Maturity date | Dec. 15, 2016 |  |
Subordinated notes | $ 49,900,000 us-gaap_SubordinatedDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember | $ 49,900,000 us-gaap_SubordinatedDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember |
Percentage of debt qualify as Tier 2 Capital (in hundredths) | 20.00%trmk_PercentageOfDebtQualifyAsTierTwoCapital / us-gaap_LongtermDebtTypeAxis = us-gaap_SubordinatedDebtMember |  |
Subordinated Notes Payable [Member] | Minimum [Member] |  |  |
Long-Term Borrowings [Abstract] |  |  |
Maturity period | 1 year |  |
Subordinated Notes Payable [Member] | Maximum [Member] |  |  |
Long-Term Borrowings [Abstract] |  |  |
Maturity period | 2 years |  |

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- Definition Represents the number of outstanding long-term FHLB advances. + References No definition available. + Details
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- Definition Weighted average cost related to FHLB advances. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64702-112823 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 + Details
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