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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest income $ 23,762 $ 24,049 $ 24,305 $ 23,192 $ 23,416 $ 23,621 $ 24,137 $ 23,550 $ 95,308 $ 94,724 $ 96,102
Interest expense 2,029 1,999 2,011 2,051 2,459 2,500 2,446 2,439 8,090 9,844 11,349
Net interest income 21,733 22,050 22,294 21,141 20,957 21,121 21,691 21,111 87,218 84,880 84,753
Provision for loan losses 615 730 934 492 500 (1,154) 722 1,187 2,771 1,255 2,191
Net interest income after provision 21,118 21,320 21,360 20,649 20,457 22,275 20,969 19,924 84,447 83,625 82,562
Noninterest income, excluding net gain (loss) on sale of securities 7,951 7,135 6,132 5,691 5,850 5,870 7,109 7,902      
Net (loss) gain on sale of securities (4) (657) 388 25 (79) 1 (661) 335 144
Noninterest expense 17,132 16,909 17,458 17,083 16,653 18,557 18,722 18,814 68,582 72,746 76,171
Income before income taxes 11,933 11,546 9,377 9,257 10,042 9,613 9,277 9,013 42,113 37,945 35,921
Income tax expense 10,720 3,894 2,959 3,055 3,638 3,230 3,022 2,929 20,628 12,819 11,381
Net income available to common shareholders $ 1,213 $ 7,652 $ 6,418 $ 6,202 $ 6,404 $ 6,383 $ 6,255 $ 6,084 $ 21,485 $ 25,126 $ 24,435
Basic (in dollars per share) $ 0.07 $ 0.45 $ 0.38 $ 0.36 $ 0.38 $ 0.37 $ 0.36 $ 0.34 $ 1.26 $ 1.45 $ 1.32
Diluted (in dollars per share) 0.07 0.45 0.38 0.36 0.38 0.37 0.36 0.34 1.26 1.45 1.31
Common dividends declared, per share (in dollars per share) $ 0.18 $ 0.18 $ 0.16 $ 0.16 $ 0.16 $ 0.16 $ 0.14 $ 0.14 $ 0.68 $ 0.60 $ 0.54
Weighted average common shares outstanding, basic (in shares) 16,992,519 17,005,654 17,012,189 16,998,125 16,981,010 17,031,074 17,414,320 17,859,197 17,002,116 17,319,689 18,531,039
Weighted average diluted shares outstanding (in shares) 17,083,949 17,082,729 17,082,832 17,072,174 17,043,869 17,083,526 17,462,845 17,892,531 17,077,842 17,365,524 18,727,464