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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Securities, market value $ 615,458 $ 744,432
Common stock, par value $ 1 $ 1
Common stock, shares authorized 20,000,000 20,000,000
Common stock, shares issued 15,117,430 15,368,717
Common stock, shares outstanding 15,117,430 15,368,717
Accumulated other comprehensive income, tax $ 5,084 $ 4,551
Senior Preferred Stock [Member]
    
Preferred stock, par value $ 1 $ 1
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 0 0
Cumulative Preferred Stock [Member]
    
Preferred stock, par value $ 5 $ 5
Preferred stock, shares authorized 900,000 900,000
Preferred stock, shares issued 0 0