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Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Retained Earnings [Member] |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.20 | $ 0.16 | $ 0.08
Common Stock [Member] |  |  |
Proceeds from issuance of common stock, net of issuance costs, shares (in shares) |  | 1,215,000 | 3,680,000
Issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan (in shares) | 13,318 | 20,192 | 24,033
Issuance of shares of common stock as s result of stock options exercised (in shares) | 114,100 | 111,423 | 79,638
Retirement of treasury stock, shares of common stock (in shares) |  |  | 121,246
Restricted stock awards (in shares) | 28,289 | 21,882 | 28,846
Exchange of shares of common stock in connection with stock options exercised and restricted stock vested (in shares) | 23,054 | 22,735 | 4,631
Issuance of shares of common stock as a result of the acquisition of Guaranty Bank & Trust, net of issuance cost (in shares) | 678,670 |  |
Cash dividends declared per common share (in dollars per share) | $ 0.20 | $ 0.16 | $ 0.08
Issuance of shares of common stock as s result of stock options exercised (in shares) | 114,100 | 111,423 | 79,638

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