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v2.4.1.9

Borrowings, Junior Subordinated Debt Securities (Details) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Aug. 18, 2006 Quarter
Variable Interest Entity [Line Items] |  |  |  |
Junior subordinated debt securities | $ 61,856,000 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust | $ 61,856,000 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust |  |
Total assets | 12,250,633,000 us-gaap_Assets | 11,790,383,000 us-gaap_Assets |  |
Total liabilities and shareholders' equity | 12,250,633,000 us-gaap_LiabilitiesAndStockholdersEquity | 11,790,383,000 us-gaap_LiabilitiesAndStockholdersEquity |  |
Common securities | 14,060,000 us-gaap_CommonStockValue | 14,038,000 us-gaap_CommonStockValue |  |
Net income | 123,562,000 us-gaap_NetIncomeLoss | 117,060,000 us-gaap_NetIncomeLoss | 117,283,000 us-gaap_NetIncomeLoss |
Trustmark Preferred Capital Trust I [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets | 61,900,000 us-gaap_Assets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember | 61,900,000 us-gaap_Assets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember |  |
Total liabilities and shareholders' equity | 61,900,000 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember | 61,900,000 us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember |  |
Common securities | 1,900,000 us-gaap_CommonStockValue / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember | 1,900,000 us-gaap_CommonStockValue / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember |  |
Net income | 36,800 us-gaap_NetIncomeLoss / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember | 37,600 us-gaap_NetIncomeLoss / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember | 41,300 us-gaap_NetIncomeLoss / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember |
Dividends paid | 36,800 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember | 37,600 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember | 41,300 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember |
Trustmark Preferred Capital Trust I [Member] | Junior Subordinated Debt Securities [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Face amount of debt issued |  |  |  | 60,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember
Maturity date |  |  |  | Sep. 30, 2036
Variable interest rate, description |  |  |  | three-month LIBOR
Basis spread over LIBOR rate (in hundredths) |  |  |  | 1.72%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember
Junior subordinated debt securities |  |  |  | $ 61,900,000 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember
Consecutive quarters that Trustmark may defer interest payments |  |  |  | 20 trmk_ConsecutiveQuartersThatInterestPaymentsOnDebenturesMayBeDeferred / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryAggregatedDisclosureMember

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