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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares | 3 Months Ended
--- | ---
Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2014 | Mar. 31, 2014
Common cash dividends declared (in Dollars per share) | $ 0.04 |  | $ 0.04 |
Common Stock [Member] |  |  |  |
Proceeds from issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan | 8,558 | 5,679 | 8,361 | 6,189
Proceeds from issuance of shares of common stock as a result of stock options exercised | 17,240 | 9,688 | 630 | 9,814
Exchange of shares of common stock in connection with restricted stock vested | 630 | 3,272 |  | 10,300
Proceeds from issuance of common stock, net of issuance costs | 3,680,000 |  |  |
Series F Noncumulative Perpetual Preferred Stock [Member] | Preferred Stock [Member] |  |  |  |
Redemption of shares of Noncumulative Perpetual Preferred Stock |  |  | 14,867 | 15,000

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