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Borrowings (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 Loan | Dec. 31, 2013 | Dec. 31, 2012
Short-Term Borrowings [Abstract] |  |  |
Total short-term borrowings | $ 425,077,000 us-gaap_ShortTermBorrowings | $ 66,385,000 us-gaap_ShortTermBorrowings |
Fair Market Value Adjustment [Member] |  |  |
Short-Term Borrowings [Abstract] |  |  |
Total short-term borrowings | 178,000 us-gaap_ShortTermBorrowings / us-gaap_NonrecurringAdjustmentAxis = trmk_FairMarketValueAdjustmentMember | 28,000 us-gaap_ShortTermBorrowings / us-gaap_NonrecurringAdjustmentAxis = trmk_FairMarketValueAdjustmentMember |
Atlanta [Member] |  |  |
Short-Term Borrowings [Abstract] |  |  |
Number of outstanding short-term FHLB advances | 2 trmk_NumberOfOutstandingShortTermFhlbAdvances / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember |  |
Interest expense, short-term borrowings | 197,000 us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember | 6,000 us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember | 81,000 us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember
Dallas [Member] |  |  |
Short-Term Borrowings [Abstract] |  |  |
Additional debt instrument borrowing capacity | 1,678,000,000 us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount / us-gaap_StatementGeographicalAxis = trmk_DallasMember | 1,768,000,000 us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount / us-gaap_StatementGeographicalAxis = trmk_DallasMember |
Federal Home Loan Bank Advances [Member] |  |  |
Short-Term Borrowings [Abstract] |  |  |
Total short-term borrowings | 356,758,000 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 2,062,000 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember |
Federal Home Loan Bank Advances [Member] | Atlanta [Member] |  |  |
Short-Term Borrowings [Abstract] |  |  |
Number of outstanding short-term FHLB advances |  | 2 trmk_NumberOfOutstandingShortTermFhlbAdvances / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember |
Weighted average remaining maturity | 297 days | 134 days |
Weighted average cost related to FHLB advances (in hundredths) | 3.96%trmk_WeightedAverageCost / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember | 4.24%trmk_WeightedAverageCost / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember |
Federal Home Loan Bank Advances [Member] | Dallas [Member] |  |  |
Short-Term Borrowings [Abstract] |  |  |
Number of outstanding short-term FHLB advances | 4 trmk_NumberOfOutstandingShortTermFhlbAdvances / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_DallasMember |  |
Total short-term borrowings | 350,000,000 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_DallasMember | 0 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_DallasMember |
Weighted average remaining maturity | 9 days |  |
Weighted average cost related to FHLB advances (in hundredths) | 0.14%trmk_WeightedAverageCost / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_DallasMember |  |
Federal Home Loan Bank Advances [Member] | Dallas [Member] | Maximum [Member] |  |  |
Short-Term Borrowings [Abstract] |  |  |
Total short-term borrowings | 100,000,000 us-gaap_ShortTermBorrowings / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_DallasMember |  |
Interest rate (in hundredths) | 0.18%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_DallasMember |  |
Federal Home Loan Bank Advances [Member] | Dallas [Member] | Minimum [Member] |  |  |
Short-Term Borrowings [Abstract] |  |  |
Total short-term borrowings | 50,000,000 us-gaap_ShortTermBorrowings / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_DallasMember |  |
Interest rate (in hundredths) | 0.10%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_DallasMember |  |
Federal Home Loan Bank Advances [Member] | Advance One [Member] | Atlanta [Member] |  |  |
Short-Term Borrowings [Abstract] |  |  |
Total short-term borrowings | 80,000 us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = trmk_AdvanceOneMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember | 2,000,000 us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = trmk_AdvanceOneMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember |
Interest rate (in hundredths) | 6.95%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = trmk_AdvanceOneMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember | 4.21%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = trmk_AdvanceOneMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember |
Federal Home Loan Bank Advances [Member] | Advance Two [Member] | Atlanta [Member] |  |  |
Short-Term Borrowings [Abstract] |  |  |
Total short-term borrowings | 6,500,000 us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = trmk_AdvanceTwoMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember | 34,000 us-gaap_ShortTermBorrowings / us-gaap_DebtInstrumentAxis = trmk_AdvanceTwoMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember |
Interest rate (in hundredths) | 3.92%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = trmk_AdvanceTwoMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember | 6.11%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = trmk_AdvanceTwoMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember / us-gaap_StatementGeographicalAxis = trmk_AtlantaMember |
Serviced GNMA Loans Eligible for Repurchase [Member] |  |  |
Short-Term Borrowings [Abstract] |  |  |
Total short-term borrowings | 41,014,000 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = trmk_ServicedGnmaLoansEligibleForRepurchaseMember | 38,036,000 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = trmk_ServicedGnmaLoansEligibleForRepurchaseMember |
Other [Member] |  |  |
Short-Term Borrowings [Abstract] |  |  |
Total short-term borrowings | $ 27,305,000 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = trmk_OtherShortTermBorrowingsMember | $ 26,287,000 us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = trmk_OtherShortTermBorrowingsMember |

X
- Definition Represents the number of outstanding short-term FHLB advances. + References No definition available. + Details
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- Definition The cost of acquiring the advances. + References No definition available. + Details
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X
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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: 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(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Subparagraph b -Article 5 + Details
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- Definition Interest expense incurred during the reporting period on short-term borrowings associated with Federal Home Loan Bank and Federal Reserve Bank advances. + References No definition available. + Details
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -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 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: 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.(a),16(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Subparagraph a(1) -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 + Details
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- Definition Weighted average interest rate of short-term debt outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph b -Article 5 + Details
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