| 
           INVESTMENT SECURITIES (Amortized cost and related market value of investment securities available-for-sale) (Details) (USD $) 
        In Thousands, unless otherwise specified  | 
        
           Mar. 31, 2013 
         | 
        
           Dec. 31, 2012 
         | 
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|---|---|---|---|---|---|---|
| Amortized cost and related market value of investment securities available-for-sale | ||||||
| Amortized Cost | $ 306,569 | $ 296,059 | ||||
| Unrealized Gains | 1,633 | 1,654 | ||||
| Unrealized Losses | 700 | 728 | ||||
| Market value | 307,502 | 296,985 | ||||
| 
           U.S. Government Treasury [Member] 
         | 
        ||||||
| Amortized cost and related market value of investment securities available-for-sale | ||||||
| Amortized Cost | 94,550 | 96,745 | ||||
| Unrealized Gains | 355 | 504 | ||||
| Unrealized Losses | ||||||
| Market value | 94,905 | 97,249 | ||||
| 
           U.S. Government Agency [Member] 
         | 
        ||||||
| Amortized cost and related market value of investment securities available-for-sale | ||||||
| Amortized Cost | 52,178 | 51,468 | ||||
| Unrealized Gains | 216 | 221 | ||||
| Unrealized Losses | 22 | 25 | ||||
| Market value | 52,372 | 51,664 | ||||
| 
           States and Political Subdivisions [Member] 
         | 
        ||||||
| Amortized cost and related market value of investment securities available-for-sale | ||||||
| Amortized Cost | 82,860 | 79,818 | ||||
| Unrealized Gains | 172 | 124 | ||||
| Unrealized Losses | 38 | 63 | ||||
| Market value | 82,994 | 79,879 | ||||
| 
           Mortgage-Backed Securities [Member] 
         | 
        ||||||
| Amortized cost and related market value of investment securities available-for-sale | ||||||
| Amortized Cost | 66,167 | 56,217 | ||||
| Unrealized Gains | 890 | 805 | ||||
| Unrealized Losses | 40 | 40 | ||||
| Market value | 67,017 | 56,982 | ||||
| 
           Other Securities [Member] 
         | 
        ||||||
| Amortized cost and related market value of investment securities available-for-sale | ||||||
| Amortized Cost | 10,814 | [1] | 11,811 | [1] | ||
| Unrealized Gains | [1] | [1] | ||||
| Unrealized Losses | 600 | [1] | 600 | [1] | ||
| Market value | $ 10,214 | [1] | $ 11,211 | [1] | ||
          
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