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Note 23 - Quarterly Financial Data (Unaudited) - Summary of Quarterly Earnings (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Interest income | $ 25,381 | $ 24,286 | $ 24,297 | $ 24,330 | $ 23,762 | $ 24,049 | $ 24,305 | $ 23,192 | $ 98,294 | $ 95,308 | $ 94,724
Interest expense | 1,502 | 1,961 | 2,035 | 1,951 | 2,029 | 1,999 | 2,011 | 2,051 | 7,449 | 8,090 | 9,844
Net interest income | 23,879 | 22,325 | 22,262 | 22,379 | 21,733 | 22,050 | 22,294 | 21,141 | 90,845 | 87,218 | 84,880
Provision for loan losses | 908 | 495 | 495 | 495 | 615 | 730 | 934 | 492 | 2,393 | 2,771 | 1,255
Net interest income after provision | 22,971 | 21,830 | 21,767 | 21,884 | 21,118 | 21,320 | 21,360 | 20,649 | 88,452 | 84,447 | 83,625
Noninterest income, excluding net gain (loss) on sale of securities | 6,297 | 7,137 | 6,959 | 6,668 | 7,502 | 6,703 | 5,712 | 5,312 |  |  |
Net (loss) gain on sale of securities |  | (618) |  |  | (4) |  | (657) |  | (618) | (661) | 335
Noninterest expense | 17,366 | 18,131 | 17,160 | 17,116 | 16,683 | 16,477 | 17,038 | 16,704 | 69,773 | 66,902 | 71,214
Income before income taxes | 11,902 | 10,218 | 11,566 | 11,436 | 11,933 | 11,546 | 9,377 | 9,257 | 45,122 | 42,113 | 37,945
Income tax expense | 2,596 | 1,118 | 2,500 | 2,568 | 10,720 | 3,894 | 2,959 | 3,055 | 8,782 | 20,628 | 12,819
Net income | $ 9,306 | $ 9,100 | $ 9,066 | $ 8,868 | $ 1,213 | $ 7,652 | $ 6,418 | $ 6,202 | $ 36,340 | $ 21,485 | $ 25,126
Basic (in dollars per share) | $ 0.58 | $ 0.55 | $ 0.54 | $ 0.52 | $ 0.07 | $ 0.45 | $ 0.38 | $ 0.36 | $ 2.19 | $ 1.26 | $ 1.45
Diluted (in dollars per share) | 0.57 | 0.55 | 0.54 | 0.52 | 0.07 | 0.45 | 0.38 | 0.36 | 2.18 | 1.26 | 1.45
Common dividends declared, per share (in dollars per share) | $ 0.21 | $ 0.21 | $ 0.18 | $ 0.66 | $ 0.18 | $ 0.18 | $ 0.16 | $ 0.16 | $ 1.26 | $ 0.68 | $ 0.60
Weighted average common shares outstanding, basic (in shares) | 16,201,148 | 16,512,823 | 16,689,398 | 16,955,758 | 16,992,519 | 17,005,654 | 17,012,189 | 16,998,125 | 16,587,504 | 17,002,116 | 17,319,689
Weighted average diluted shares outstanding (in shares) | 16,280,404 | 16,612,416 | 16,788,615 | 17,047,638 | 17,083,949 | 17,082,729 | 17,082,832 | 17,072,174 | 16,666,385 | 17,077,842 | 17,365,524

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