CONDENSED PARENT COMPANY INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets
Other assets	$ 156,690us-gaap_OtherAssets	$ 180,888us-gaap_OtherAssets
Total Assets	13,326,369us-gaap_Assets	13,029,733us-gaap_Assets	13,397,198us-gaap_Assets
Liabilities and shareholders' equity:
Total liabilities	11,720,310us-gaap_Liabilities	11,516,603us-gaap_Liabilities
Shareholders' equity	1,606,059us-gaap_StockholdersEquity	1,513,130us-gaap_StockholdersEquity	1,449,052us-gaap_StockholdersEquity	1,262,912us-gaap_StockholdersEquity
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	13,326,369	13,029,733
Condensed Statements of Income [Abstract]
Income before income taxes	167,402	131,666	117,547
Income tax benefit	(50,652)us-gaap_IncomeTaxExpenseBenefit	(37,551)us-gaap_IncomeTaxExpenseBenefit	(33,252)us-gaap_IncomeTaxExpenseBenefit
Net Income	116,750us-gaap_NetIncomeLoss	94,115us-gaap_NetIncomeLoss	84,295us-gaap_NetIncomeLoss
Operating activities:
Net income	116,750us-gaap_NetIncomeLoss	94,115us-gaap_NetIncomeLoss	84,295us-gaap_NetIncomeLoss
Net cash provided by operating activities	142,129	203,732	160,657
Investing activities:
Net cash (used in) provided by investing activities	(459,359)	(480,032)	265,147
Financing activities:
Cash dividends	(23,983)us-gaap_PaymentsOfDividendsCommonStock	(11,383)us-gaap_PaymentsOfDividendsCommonStock	(3,778)us-gaap_PaymentsOfDividendsCommonStock
Redemption of junior subordinated debt securities	(8,248)	(128,866)
Advance of long-term debt	8,000	50,000
Repayment of long-term debt	(8,066)us-gaap_RepaymentsOfLongTermDebt	(1,786)us-gaap_RepaymentsOfLongTermDebt
Common stock transactions, net	11,583	912	110,229
Net cash (used in) provided by financing activities	146,057	(398,891)	278,466
(Decrease) increase in Cash and Cash Equivalents	(171,173)	(675,191)	704,270
Cash and Cash Equivalents at Beginning of Year	528,423	1,203,614	499,344
Cash and Cash Equivalents at End of Year	357,250	528,423	1,203,614
BancorpSouth, Inc. (Parent Company Only) [Member]
Assets
Cash on deposit with subsidiary bank	93,270	56,751
Investment in subsidiaries	1,576,708	1,527,137
Other assets	10,404	11,525
Total Assets	1,680,382	1,595,413
Liabilities and shareholders' equity:
Total liabilities	74,323	82,283
Shareholders' equity	1,606,059	1,513,130
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	1,680,382	1,595,413
Condensed Statements of Income [Abstract]
Dividends from subsidiaries	60,000	35,000
Other operating income	585	1,775	1,253
Total income	60,585	36,775	1,253
Operating expenses	6,867	15,033	16,931
Income before income taxes	53,718	21,742	(15,678)
Income tax benefit	2,420	5,860	5,732
Income (loss) before equity in undistributed earnings of subsidiaries	56,138	27,602	(9,946)
Equity in undistributed (distributed) earnings of subsidiaries	60,612	66,513	94,241
Net Income	116,750	94,115	84,295
Operating activities:
Net income	116,750	94,115	84,295
Adjustments to reconcile net income to net cash provided by operating activities	(61,862)	(62,419)	(95,231)
Net cash provided by operating activities	54,888	31,696	(10,936)
Financing activities:
Cash dividends	(23,983)	(11,383)	(3,778)
Redemption of junior subordinated debt securities	(8,248)	(128,866)
Advance of long-term debt	8,000	50,000
Repayment of long-term debt	(8,066)	(1,786)
Common stock transactions, net	13,928	2,696	112,008
Net cash (used in) provided by financing activities	(18,369)	(89,339)	108,230
(Decrease) increase in Cash and Cash Equivalents	36,519	(57,643)	97,294
Cash and Cash Equivalents at Beginning of Year	56,751	114,394	17,100
Cash and Cash Equivalents at End of Year	$ 93,270	$ 56,751	$ 114,394

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

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Amount of cash inflow from proceeds of Federal Home Loan Bank (FHLBank) advances.

+ References

No definition available.

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- Definition

The cash inflow from the additional capital contribution to the entity.

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The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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