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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Earnings Per Share [Abstract] |  |  |  |
Distributed earnings allocated to common stock | $ 6,178 | $ 5,751 | $ 12,356 | $ 11,502
Undistributed earnings allocated to common stock | 6,448 | 7,139 | 13,931 | 9,303
Net Income (Loss) Available to Common Stockholders, Basic | $ 12,626 | $ 12,890 | $ 26,287 | $ 20,805
Average shares outstanding (in shares) | 15,556,000 | 15,582,000 | 15,583,000 | 15,521,000
Effect of dilutive securities: |  |  |  |
Warrant outstanding (in shares) | 62,000 | 62,000 | 62,000 | 59,000
Employee stock awards (in shares) | 88,000 | 108,000 | 93,000 | 107,000
Shares for diluted earnings per share (in shares) | 15,706,000 | 15,752,000 | 15,738,000 | 15,687,000
Basic earnings per share (in dollars per share) | $ 0.81 | $ 0.83 | $ 1.69 | $ 1.34
Diluted earnings per share (in dollars per share) | $ 0.80 | $ 0.82 | $ 1.67 | $ 1.33
Options to purchase shares of common stock, anti-dilutive (in shares) | 0 | 57,500 |  |
Common stock exercise price, lower limit (in dollars per share) |  | $ 39.34 |  |
Common stock exercise price, upper limit (in dollars per share) |  | $ 40.88 |  |

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