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Note 9 - Acquisition of Community State Bank and Common Stock Offering - Pro Forma Combined Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Interest income | $ 27,615 | $ 25,685 | $ 80,755 | $ 73,051
Noninterest income | 11,415 | 8,074 | 27,744 | 23,167
Net income | $ 7,301 | $ 8,216 | $ 23,813 | $ 15,324
Earnings per common share: |  |  |  |
Basic (in dollars per share) | $ 0.56 | $ 0.64 | $ 1.85 | $ 1.38
Diluted (in dollars per share) | $ 0.55 | $ 0.63 | $ 1.82 | $ 1.36

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