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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Capital increase related to Equity Incentive Plan $ 4,461,000 $ 4,265,000 $ 698,000
Common stock, dividends per share (in USD per share) $ 1.84 $ 1.78 $ 1.60
Common Stock [Member]      
Capital increase related to Equity Incentive Plan $ 2,000 $ 0 $ 2,000