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DEPOSITS (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
DEPOSITS.      
Time deposits of $100,000 or more $ 674,115,000 $ 657,300,000  
Interest expense on certificates of deposits of $100,000 or more 1,800,000 3,200,000 6,300,000
Maturities of time deposits of $100,000 or more      
Three months or less 322,959,000    
Over three through six months 204,140,000    
Over six through twelve months 86,618,000    
2014 24,119,000    
2015 26,547,000    
2016 2,496,000    
2017 7,236,000    
Total 674,115,000 657,300,000  
Overdrawn deposit accounts reclassified as loans $ 800,000 $ 700,000