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LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES - Interest Income on Impaired Loans (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Impaired Financing Receivable, Average Recorded Investment and Interest [Abstract]      
Average recorded investment (year-to-date) $ 13,233 $ 14,416 $ 18,562
Interest income recognized 572 943 1,057
Accruing interest at original contracted rate 1,348 1,831 2,207
Construction
      
Impaired Financing Receivable, Average Recorded Investment and Interest [Abstract]      
Average recorded investment (year-to-date) 3,222 4,054 6,013
Interest income recognized 2 18 4
Accruing interest at original contracted rate 241 292 356
1-4 Family Residential
      
Impaired Financing Receivable, Average Recorded Investment and Interest [Abstract]      
Average recorded investment (year-to-date) 2,873 2,362 1,250
Interest income recognized 38 112 49
Accruing interest at original contracted rate 128 153 139
Other
      
Impaired Financing Receivable, Average Recorded Investment and Interest [Abstract]      
Average recorded investment (year-to-date) 1,734 1,744 1,445
Interest income recognized 69 50 16
Accruing interest at original contracted rate 178 130 117
Commercial Loans
      
Impaired Financing Receivable, Average Recorded Investment and Interest [Abstract]      
Average recorded investment (year-to-date) 2,234 1,748 1,950
Interest income recognized 32 2 8
Accruing interest at original contracted rate 128 65 48
Loans to Individuals
      
Impaired Financing Receivable, Average Recorded Investment and Interest [Abstract]      
Average recorded investment (year-to-date) 3,170 4,508 7,904
Interest income recognized 431 761 980
Accruing interest at original contracted rate $ 673 $ 1,191 $ 1,547