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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Securities, market value $ 574,230 $ 615,458 $ 681,825
Common stock, par value $ 1 $ 1 $ 1
Common stock, shares authorized 20,000,000 20,000,000 20,000,000
Common stock, shares issued 15,145,280 15,117,430 15,390,357
Common stock, shares outstanding 15,145,280 15,117,430 15,390,357
Accumulated other comprehensive income, tax $ 4,043 $ 5,084 $ 4,476
Senior Preferred Stock [Member]
      
Preferred stock, par value $ 1 $ 1 $ 1
Preferred stock, shares authorized 10,000,000 10,000,000 10,000,000
Preferred stock, shares issued 0 0 0
Cumulative Preferred Stock [Member]
      
Preferred stock, par value $ 5 $ 5 $ 5
Preferred stock, shares authorized 900,000 900,000 900,000
Preferred stock, shares issued 0 0 0