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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Common stock issued in acquisition, shares 1,873,879    
Exercise of stock options, shares, including tax benefit 40,000 31,875 28,750
Reissue of treasury stock, shares 6,497 39,811 94,895
Cash dividends declared, per share $ 0.66 $ 0.66 $ 0.66
Additional Paid-In Capital [Member]
      
Common stock issued in acquisition, shares 1,873,879    
Restricted stock award grants shares 31,500 26,900 17,900
Forfeiture of restricted stock award grants, shares     1,488
Exercise of stock options, shares, including tax benefit 40,000 31,875 28,750
Reissue of treasury stock, shares 6,497 39,811 94,895
Retained Earnings [Member]
      
Cash dividends declared, per share $ 0.66 $ 0.66 $ 0.66
Treasury Stock [Member]
      
Restricted stock award grants shares 31,500 26,900 17,900
Forfeiture of restricted stock award grants, shares     1,488
Exercise of stock options, shares, including tax benefit 40,000 31,875 28,750
Reissue of treasury stock, shares 6,497 39,811 94,895