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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]      
Cash dividends declared on common stock (in Dollars per share) $ 0.300 $ 0.300 $ 0.300
Issuance of restricted stock awards, shares 57,164 70,019 69,258
Exercise of stock options, shares 66,389 136,429 340,492
Secondary offering of common stock, shares   1,659,794  
Offering costs for common shares   $ 1,811