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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Stockholders' Equity      
Dividends declared (in dollars per share) $ 1.24 $ 1.24 $ 1.24
Share retired, shares 16,463 137,752 3,386
Reissuance under option plan, shares     600
Repurchase and retirement, shares     1,800