Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)

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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Issuance of Common Stock on exercise of stock purchase warrants (in shares)     392
Cash dividend (in dollars per share) $ 0.12 $ 0.11 $ 0.08
Common Stock [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Number of shares repurchased for taxes withheld on vested restricted stock (in shares) 30,350 29,676 20,534