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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dividend reinvestment plan, shares     63,349 90,110 100,383
Stock purchase and compensation plans, shares     862,662 857,403 783,661
Dividends to stockholders, per share $ 0.13 [1] $ 0.13 [1] $ 0.52 $ 0.52 $ 0.52
Acquisition of treasury stock, shares     167,846 194,575 149,997
Preferred stock, par value per share $ 0 $ 0 $ 0 $ 0 $ 0
Preferred stock, shares authorized 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000
Preferred stock, shares issued 0 0 0 0 0
Series A Preferred Stock [Member]
          
Preferred stock, par value per share $ 0 $ 0 $ 0 $ 0 $ 0
Preferred stock, shares authorized 300,000 300,000 300,000 300,000 300,000
[1] 1 See Note 20. “Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds” for a discussion of dividend restrictions.