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Business Combinations, (Bay Bank and Trust Company) (Details) (USD $) Share data in Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended | 3 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 16, 2012 | Jun. 30, 2012 | Mar. 31, 2012
Assets: |  |  |  |  |  |
Total Assets | $ 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets | $ 1,845,543,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets | $ 234,960,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets |  |  |
Liabilities: |  |  |  |  |  |
Total Liabilities | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities | 1,821,066,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities | 209,322,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities |  |  |
Bargain purchase gain | 0 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount | 0 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount | 3,635,000 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount |  |  |
Amortization period of acquired intangible asset | 20 years |  |  |  |  |
Bay Bank and Trust Company [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Age of acquired entity |  |  |  | 76 years |  |
Business acquisition, cost of acquired entity, cash paid |  |  |  | 10,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Business acquisition, equity issued (in shares) |  |  |  | 510 trmk_BusinessAcquisitionEquityInterestIssuedOrIssuableNumberOfSharesAtAcquisition / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Business acquisition, equity issued, value assigned |  |  |  | 12,000,000 us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Assets: |  |  |  |  |  |
Cash and due from banks |  |  |  | 88,154,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Securities available for sale |  |  |  | 26,369,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Acquired noncovered loans |  |  |  | 97,914,000 trmk_BusinessAcquisitionPurchasePriceAllocationLhfiLoansAndLeasesExcludingCoveredLoans / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Premises and equipment, net |  |  |  | 9,466,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Identifiable intangible assets |  |  |  | 7,017,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Other real estate |  |  |  | 2,569,000 trmk_BusinessAcquisitionOtherRealEstateAcquired / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Other assets |  |  |  | 3,471,000 trmk_BusinessAcquisitionPurchasePriceAllocationOtherAssets1 / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Total Assets |  |  |  | 234,960,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Liabilities: |  |  |  |  |  |
Deposits |  |  |  | 208,796,000 trmk_BusinessAcquisitionPurchasePriceAllocationDepositsAcquired / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Other liabilities |  |  |  | 526,000 trmk_BusinessAcquisitionPurchasePriceAllocationOtherLiabilities1 / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Total Liabilities |  |  |  | 209,322,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Net assets acquired at fair value |  |  |  | 25,638,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Consideration paid to Bay Bank |  |  |  | 22,003,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Bargain purchase gain |  |  |  | 3,635,000 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember | 881,000 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember | 2,800,000 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember
Income taxes |  |  |  | 0 trmk_BusinessCombinationBargainPurchaseGainTaxAmount / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Bargain purchase gain, net of taxes |  |  |  | 3,635,000 trmk_BusinessCombinationBargainPurchaseGainRecognizedAmountNetOfTax / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember |  |
Business acquisition, total transaction expenses |  |  |  |  |  | 2,600,000 trmk_BusinessAcquisitionTotalTransactionExpenses / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember
Business acquisition, severance expense |  |  |  |  |  | 672,000 trmk_BusinessAcquisitionSeveranceExpense / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember
Business acquisition, contract termination and other expenses |  |  |  |  |  | $ 1,900,000 trmk_BusinessAcquisitionContractTerminationAndOtherExpenses / us-gaap_BusinessAcquisitionAxis = trmk_BayBankAndTrustCompanyMember
Amortization period of acquired intangible asset |  |  |  |  |  | 10 years

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References No definition available. + Details
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- Definition The amount of acquisition cost of a business combination allocated to deposits of the acquired entity. + References No definition available. + Details
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- Definition The amount of LHFI, excluding covered loans acquired in a business combination. + References No definition available. + Details
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- Definition The amount of acquisition cost of a business combination allocated to other assets of the acquired entity, except for property plant and equipment, intangible assets, and goodwill. + References No definition available. + Details
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- Definition The amount of acquisition cost of a business combination allocated to other liabilities of the acquired entity. + References No definition available. + Details
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- Definition The portion of business combination expenses related to the termination of employees resulting from the combination. + References No definition available. + Details
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- Definition The total transaction costs of a business acquisition. + References No definition available. + Details
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity, net of tax expense. + References No definition available. + Details
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of tax expense on the gross gain recognized by the entity. + References No definition available. + Details
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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6571-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6527-128477 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6396-128476 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6387-128476 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6393-128476 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition Useful life of finite-lived intangible assets, 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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