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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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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 |

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