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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Statement of Stockholders' Equity [Abstract]    
Dividends declared (in dollars per share) $ 0.93 $ 0.93
Share retired, shares 29,249 3,386
Reissuance under option plan, shares   600
Repurchase and held, shares   1,800