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LONG-TERM OBLIGATIONS - Other Long-term Debt by Type of Trust (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Rate
Dec. 31, 2012
Debt Instrument [Line Items]    
Other Long-term Debt $ 60,311,000 $ 60,311,000
Option fee, fair value 0 0
Magnolia Trust Company I
   
Debt Instrument [Line Items]    
Other Long-term Debt 3,609,000 [1] 3,609,000 [1]
Debt maturity dates 2035  
Adjusted rate of debt 2.0376%  
Date of interest rate adjustment February 23, 2014  
Debt instrument, description of variable rate basis three-month LIBOR plus 180 basis points  
Magnolia Trust Company I | LIBOR
   
Debt Instrument [Line Items]    
Basis spread on variable rate 1.80%  
Southside Statutory Trust V
   
Debt Instrument [Line Items]    
Other Long-term Debt 12,887,000 [2] 12,887,000 [2]
Debt maturity dates 2037  
Adjusted rate of debt 2.49285%  
Date of interest rate adjustment March 16, 2014  
Debt instrument, description of variable rate basis three-month LIBOR plus 225 basis points  
Southside Statutory Trust V | LIBOR
   
Debt Instrument [Line Items]    
Basis spread on variable rate 2.25%  
Southside Statutory Trust IV
   
Debt Instrument [Line Items]    
Other Long-term Debt 23,196,000 [3] 23,196,000 [3]
Debt maturity dates 2037  
Adjusted rate of debt 1.53585%  
Date of interest rate adjustment January 29, 2014  
Debt instrument, description of variable rate basis three-month LIBOR plus 130 basis points  
Southside Statutory Trust IV | LIBOR
   
Debt Instrument [Line Items]    
Basis spread on variable rate 1.30%  
Southside Statutory Trust III
   
Debt Instrument [Line Items]    
Other Long-term Debt $ 20,619,000 [4] $ 20,619,000 [4]
Debt maturity dates 2033  
Adjusted rate of debt 3.1866%  
Date of interest rate adjustment March 30, 2014  
Debt instrument, description of variable rate basis three-month LIBOR plus 294 basis points  
Southside Statutory Trust III | LIBOR
   
Debt Instrument [Line Items]    
Basis spread on variable rate 2.94%  
[1] This debt carries an adjustable rate of 2.0376% through February 23, 2014 and adjusts quarterly at a rate equal to three-month LIBOR plus 180 basis points.
[2] This debt carries an adjustable rate of 2.49285% through March 16, 2014 and adjusts quarterly at a rate equal to three-month LIBOR plus 225 basis points.
[3] This debt carries an adjustable rate of 1.53585% through January 29, 2014 and adjusts quarterly at a rate equal to three-month LIBOR plus 130 basis points.
[4] This debt carries an adjustable rate of 3.1866% through March 30, 2014 and adjusts quarterly at a rate equal to three-month LIBOR plus 294 basis points