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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Issuance of restricted stock $ 1 $ 1 $ 0
Capital increase related to Equity Incentive Plan $ 4,265 $ 698 $ 3,457
Common stock, dividends per share (in USD per share) $ 1.78 $ 1.60 $ 1.60
Common Stock [Member]      
Issuance of restricted stock $ 1 $ 1 $ 0 [1]
Capital increase related to Equity Incentive Plan $ 0 [1] $ 2  
[1] Rounds to zero.