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Mortgage Banking (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 CPR | Dec. 31, 2013 CPR | Dec. 31, 2012
Mortgage servicing rights [Abstract] |  |  |
Balance at beginning of period | $ 67,834,000 us-gaap_ServicingAssetAtFairValueAmount | $ 47,341,000 us-gaap_ServicingAssetAtFairValueAmount |
Origination of servicing assets | 12,293,000 trmk_OriginationMortgageServicingRightsMsRs | 18,481,000 trmk_OriginationMortgageServicingRightsMsRs |
Change in fair value: |  |  |
Due to market changes | (7,202,000)us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions | 11,818,000 us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions |
Due to runoff | (8,567,000)us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputs | (9,806,000)us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputs |
Balance at end of period | 64,358,000 us-gaap_ServicingAssetAtFairValueAmount | 67,834,000 us-gaap_ServicingAssetAtFairValueAmount | 47,341,000 us-gaap_ServicingAssetAtFairValueAmount
Mortgage Loans on Real Estate [Line Items] |  |  |
Total mortgage loans sold and serviced for others | 5,636,249,000 trmk_MortgageLoanSoldAndServicedForOthers | 5,460,676,000 trmk_MortgageLoanSoldAndServicedForOthers |
Schedule of changes in the reserve for mortgage loan [Abstract] |  |  |
Balance at beginning of period | 1,050,000 us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 | 7,800,000 us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 | 4,277,000 us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1
Provision for putback expenses | 600,000 us-gaap_ProvisionForLoanLossesExpensed | 1,561,000 us-gaap_ProvisionForLoanLossesExpensed | 8,015,000 us-gaap_ProvisionForLoanLossesExpensed
Losses | (480,000)us-gaap_ProvisionForLoanAndLeaseLosses | (4,756,000)us-gaap_ProvisionForLoanAndLeaseLosses | (4,492,000)us-gaap_ProvisionForLoanAndLeaseLosses
FNMA resolution | 0 trmk_PaymentsToFnmaForRepurchaseObligations | (3,555,000)trmk_PaymentsToFnmaForRepurchaseObligations | 0 trmk_PaymentsToFnmaForRepurchaseObligations
Balance at end of period | 1,170,000 us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 | 1,050,000 us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 | 7,800,000 us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1
Assumed average prepayment speed | 11.51 trmk_AssumedAveragePrepaymentSpeed | 9.72 trmk_AssumedAveragePrepaymentSpeed |
Average discount rate (in hundredths) | 10.29%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate | 10.52%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate |
Residential mortgage loans sold | 913,500,000,000 us-gaap_MortgageLoansOnRealEstateCostOfMortgagesSold | 1,358,000,000 us-gaap_MortgageLoansOnRealEstateCostOfMortgagesSold | 1,816,000,000 us-gaap_MortgageLoansOnRealEstateCostOfMortgagesSold
Gains on sales of residential mortgage loans, before tax | 10,800,000 us-gaap_GainLossOnSaleOfMortgageLoans | 26,400,000 us-gaap_GainLossOnSaleOfMortgageLoans | 33,900,000 us-gaap_GainLossOnSaleOfMortgageLoans
Servicing fee income percentage of outstanding balance of underlying loans (in hundredths) | 0.34%trmk_ServicingFeeIncomePercentageOfOutstandingBalanceOfUnderlyingLoans |  |
Mortgage loans serviced for others | 5,636,000,000 trmk_MortgageLoansServicedForOthers | 5,461,000,000 trmk_MortgageLoansServicedForOthers |
Period of putback response | 60 days |  |
Mortgage loan servicing representation and warranty expenses | 600,000 trmk_MortgageLoanServicingRepresentationAndWarrantyExpenses | 1,600,000 trmk_MortgageLoanServicingRepresentationAndWarrantyExpenses | 8,000,000 trmk_MortgageLoanServicingRepresentationAndWarrantyExpenses
Federal National Mortgage Association [Member] |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Total mortgage loans sold and serviced for others | 3,579,987,000 trmk_MortgageLoanSoldAndServicedForOthers / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember | 3,499,659,000 trmk_MortgageLoanSoldAndServicedForOthers / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember |
Government National Mortgage Association [Member] |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Total mortgage loans sold and serviced for others | 1,948,565,000 trmk_MortgageLoanSoldAndServicedForOthers / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember | 1,830,420,000 trmk_MortgageLoanSoldAndServicedForOthers / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember |
Federal Home Loan Mortgage Corporation [Member] |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Total mortgage loans sold and serviced for others | 80,551,000 trmk_MortgageLoanSoldAndServicedForOthers / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember | 92,599,000 trmk_MortgageLoanSoldAndServicedForOthers / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember |
Other [Member] |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Total mortgage loans sold and serviced for others | $ 27,146,000 trmk_MortgageLoanSoldAndServicedForOthers / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember | $ 37,998,000 trmk_MortgageLoanSoldAndServicedForOthers / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = us-gaap_MortgageBackedSecuritiesOtherMember |

X
- Definition The estimated speed of prepayments of principal on financial assets which may be one of the factors applied in estimating the fair value of servicing assets and servicing liabilities not shown as a percentage, measured in CPR (conditional prepayment rate). + References No definition available. + Details
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- Definition The amount of mortgage loan servicing put back expenses from representations and warranties on loans sold. + References No definition available. + Details
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- Definition Amount of loans that underlying mortgage loans sold and serviced for others on balance sheet date. + References No definition available. + Details
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- Definition Outstanding balance of underlying mortgage loans serviced for others + References No definition available. + Details
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- Details
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- Definition Increase during the reporting period in the cumulative value of servicing rights. This increase is the result of new servicing rights that are created when mortgages are sold or transferred. Excludes disposals of mortgage loans sold serviced released. + References No definition available. + Details
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- Definition Represents the approximate amount the Entity will pay FNMA to resolve its existing and future repurchase and make whole obligations related to mortgage loans originated between January 1, 2000 and December 31, 2008 and delivered to FNMA. + References No definition available. + Details
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- Definition The period of time the company is required to provide a response to put back requests. + References No definition available. + Details
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- Definition Servicing fee income percentage of outstanding balance of underlying loans. + References No definition available. + Details
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- Definition The net increase or decrease in fair value as a result of changes in the assumptions or model used to calculate the fair value of servicing assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The carrying amount of mortgage loans on real estate that were sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Amount of reserve for write-down of a mortgage loan on real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.7) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount of expense related to loss from loan transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition The net increase or decrease in fair value as a result of changes in the inputs used to calculate the fair value of servicing assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition Discount rate used to estimate the fair value of servicing assets and servicing liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746 + Details
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