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PENSION, OTHER POST RETIREMENT BENEFIT AND PROFIT SHARING PLANS (Information about Plan Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Actual weighted-average asset allocation [Abstract]        
Actual weighted average asset allocations 100.00% 100.00%    
Expected future benefit payments:        
2017 $ 13,248      
2018 14,733      
2019 15,613      
2020 15,567      
2021 16,383      
2022-2026 $ 83,353      
Fair value of plan assets [Abstract]        
Threshold of plan asset value at which individual investments are disclosed (in hundredths) 5.00%      
Equity Securities [Member]        
Actual weighted-average asset allocation [Abstract]        
Actual weighted average asset allocations 42.00% 33.00%    
Target asset allocations [Abstract]        
Target Plan Asset Allocations 2016 45.00%      
Debt Securities [Member]        
Actual weighted-average asset allocation [Abstract]        
Actual weighted average asset allocations 53.00% 66.00%    
Target asset allocations [Abstract]        
Target Plan Asset Allocations 2016 55.00%      
Cash and Cash Equivalents [Member]        
Actual weighted-average asset allocation [Abstract]        
Actual weighted average asset allocations 5.00% 1.00%    
Target asset allocations [Abstract]        
Target Plan Asset Allocations 2016 0.00%      
Fidelity Advisor New Insight [Member]        
Fair value of plan assets [Abstract]        
Fair value of investments that represent 5% or more of total plan asset value $ 15,411      
FidelityTotalBond [Member]        
Fair value of plan assets [Abstract]        
Fair value of investments that represent 5% or more of total plan asset value 10,733      
Franklin Mutual Discovery Z Fund [Member]        
Fair value of plan assets [Abstract]        
Fair value of investments that represent 5% or more of total plan asset value 12,450      
T Rowe Price Growth Stock Fund [Member]        
Fair value of plan assets [Abstract]        
Fair value of investments that represent 5% or more of total plan asset value 11,080      
Pioneer Multi-Asset Floating Rate Fund [Member]        
Fair value of plan assets [Abstract]        
Fair value of investments that represent 5% or more of total plan asset value 24,662      
Pension Benefits [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 215,114 $ 195,019 $ 201,352 $ 196,447
Fair value of plan assets 214,528 194,411    
Pension Benefits [Member] | Level 1 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 139,784 120,287    
Pension Benefits [Member] | Level 2 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 74,744 74,124    
Pension Benefits [Member] | Level 3 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets    
Pension Benefits [Member] | Cash [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 4,650      
Pension Benefits [Member] | Cash [Member] | Level 1 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 4,650      
Pension Benefits [Member] | Cash [Member] | Level 3 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets      
Pension Benefits [Member] | U.S. Agency Debt Obligations [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 43,533 65,406    
Fair value of plan assets   65,406    
Pension Benefits [Member] | U.S. Agency Debt Obligations [Member] | Level 2 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 43,533      
Fair value of plan assets   65,406    
Pension Benefits [Member] | U.S. Agency Debt Obligations [Member] | Level 3 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets      
Fair value of plan assets      
Pension Benefits [Member] | Mutual Funds [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 132,580 118,313    
Fair value of plan assets   118,313    
Pension Benefits [Member] | Mutual Funds [Member] | Level 1 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 132,580      
Fair value of plan assets   118,313    
Pension Benefits [Member] | Mutual Funds [Member] | Level 3 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets      
Fair value of plan assets      
Pension Benefits [Member] | Common Stock [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 2,554 1,974    
Fair value of plan assets   1,974    
Pension Benefits [Member] | Common Stock [Member] | Level 1 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 2,554      
Fair value of plan assets   1,974    
Pension Benefits [Member] | Common Stock [Member] | Level 3 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets      
Fair value of plan assets      
Pension Benefits [Member] | Money Market Funds [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 6,045 1,761    
Fair value of plan assets   1,761    
Pension Benefits [Member] | Money Market Funds [Member] | Level 2 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 6,045      
Fair value of plan assets   1,761    
Pension Benefits [Member] | Money Market Funds [Member] | Level 3 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets      
Fair value of plan assets      
Pension Benefits [Member] | Brokered Certificates of Deposit [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 25,166 6,957    
Fair value of plan assets   6,957    
Pension Benefits [Member] | Brokered Certificates of Deposit [Member] | Level 2 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 25,166      
Fair value of plan assets   6,957    
Pension Benefits [Member] | Brokered Certificates of Deposit [Member] | Level 3 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets      
Fair value of plan assets      
Pension Benefits [Member] | Total Investments [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 214,528 194,411    
Pension Benefits [Member] | Accrued Interest and Dividends [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 586 $ 608    
Basic Plan [Member] | BancorpSouth, Inc. (Parent Company Only) [Member]        
Actual weighted-average asset allocation [Abstract]        
Actual weighted average asset allocations 1.19% 1.01%    
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 2,600 $ 2,000