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Earnings per Share | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Earnings per Share | lowing table sets forth the computation of basic and diluted earnings per share using the two class method (in thousands, except per share data):
| Three months ended September 30, | Nine months ended September 30,
2018 | 2017 | 2018 | 2017
Net income available to common shareholders | $ | 20,692 |  | $ | 13,932 |  | $ | 59,283 |  | $ | 44,646 |
Less: earnings allocated to participating securities | (201 | ) | (154 | ) | (575 | ) | (488 | )
Net earnings allocated to common shareholders | $ | 20,491 |  | $ | 13,778 |  | $ | 58,708 |  | $ | 44,158 |
Distributed earnings allocated to common stock | $ | 8,109 |  | $ | 6,797 |  | $ | 22,186 |  | $ | 20,391 |
Undistributed earnings allocated to common stock | 12,382 |  | 6,981 |  | 36,522 |  | 23,767 |
Net earnings allocated to common shareholders | $ | 20,491 |  | $ | 13,778 |  | $ | 58,708 |  | $ | 44,158 |
Average shares outstanding | 15,340 |  | 15,485 |  | 15,360 |  | 15,391 |
Effect of dilutive securities: |  |  |  |  |  |
Employee stock awards | 18 |  | 20 |  | 20 |  | 24 |
Shares for diluted earnings per share | 15,358 |  | 15,505 |  | 15,380 |  | 15,415 |
Basic earnings per share | $ | 1.34 |  | $ | 0.89 |  | $ | 3.82 |  | $ | 2.87 |
Diluted earnings per share | $ | 1.33 |  | $ | 0.89 |  | $ | 3.82 |  | $ | 2.86 |
Options to purchase approximately 400 shares and 3,000 shares of common stock were outstanding during the nine months ended September 30, 2018 and 2017, respectively, but were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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