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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Actual weighted-average asset allocation [Abstract]        
Actual weighted average asset allocations 100.00% 100.00%    
Expected future benefit payments:        
2016 $ 12,614      
2017 13,264      
2018 14,493      
2019 15,800      
2020 15,881      
2021-2025 $ 85,769      
Fair value of plan assets [Abstract]        
Threshold of plan asset value at which individual investments are disclosed (in hundredths) 5.00%      
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 $ 10,610      
Fidelity Low Price Stock Fund [Member]        
Fair value of plan assets [Abstract]        
Fair value of investments that represent 5% or more of total plan asset value 14,737      
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 10,215      
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 $ 25,266      
Equity Securities [Member]        
Actual weighted-average asset allocation [Abstract]        
Actual weighted average asset allocations 33.00% 32.00%    
Target asset allocations [Abstract]        
Target Plan Asset Allocations 2016 33.00%      
Debt Securities [Member]        
Actual weighted-average asset allocation [Abstract]        
Actual weighted average asset allocations 66.00% 65.00%    
Target asset allocations [Abstract]        
Target Plan Asset Allocations 2016 67.00%      
Cash and Cash Equivalents [Member]        
Actual weighted-average asset allocation [Abstract]        
Actual weighted average asset allocations 1.00% 3.00%    
Target asset allocations [Abstract]        
Target Plan Asset Allocations 2016 0.00%      
Pension Benefits [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 195,019 $ 201,352 $ 196,447 $ 203,704
Fair value of plan assets 194,411 200,738    
Pension Benefits [Member] | Level 1 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets 120,287 125,091    
Pension Benefits [Member] | Level 2 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 74,124 $ 75,647    
Pension Benefits [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 $ 65,406 $ 69,413    
Fair value of plan assets 65,406 69,413    
Pension Benefits [Member] | U.S. Agency Debt Obligations [Member] | Level 2 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 65,406 $ 69,413    
Pension Benefits [Member] | U.S. Agency Debt Obligations [Member] | Level 3 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets    
Pension Benefits [Member] | Mutual Funds [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 118,313 $ 123,239    
Fair value of plan assets 118,313 123,239    
Pension Benefits [Member] | Mutual Funds [Member] | Level 1 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 118,313 $ 123,239    
Pension Benefits [Member] | Mutual Funds [Member] | Level 3 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets    
Pension Benefits [Member] | Common Stock [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 1,974 $ 1,852    
Fair value of plan assets 1,974 1,852    
Pension Benefits [Member] | Common Stock [Member] | Level 1 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 1,974 $ 1,852    
Pension Benefits [Member] | Common Stock [Member] | Level 3 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets    
Pension Benefits [Member] | Money Market Funds [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 1,761 $ 4,225    
Fair value of plan assets 1,761 4,225    
Pension Benefits [Member] | Money Market Funds [Member] | Level 2 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 1,761 $ 4,225    
Pension Benefits [Member] | Money Market Funds [Member] | Level 3 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets    
Pension Benefits [Member] | Brokered Certificates of Deposit [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 6,957 $ 2,009    
Fair value of plan assets 6,957 2,009    
Pension Benefits [Member] | Brokered Certificates of Deposit [Member] | Level 2 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 6,957 $ 2,009    
Pension Benefits [Member] | Brokered Certificates of Deposit [Member] | Level 3 [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets    
Pension Benefits [Member] | Total Investments [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 194,411 $ 200,738    
Pension Benefits [Member] | Accrued Interest and Dividends [Member]        
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 608 $ 614    
Basic Plan [Member] | BancorpSouth, Inc. (Parent Company Only) [Member]        
Actual weighted-average asset allocation [Abstract]        
Actual weighted average asset allocations 1.01% 0.92%    
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 2,000 $ 1,900