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Note 21 - Quarterly Financial Data (unaudited) (Details) - Selected Unaudited Quarterly Financial Data - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly operating data:                      
Interest income $ 52,468 $ 51,913 $ 50,222 $ 49,543 $ 49,171 $ 49,177 $ 49,569 $ 49,211 $ 204,146 $ 197,128 $ 200,526
Interest expense 13,052 12,603 12,082 11,989 12,057 17,220 12,740 12,724 49,726 54,741 54,863
Net interest income 39,416 39,310 38,140 37,554 37,114 31,957 36,829 36,487 154,420 142,387 145,663
Provision (benefit) for loan losses 664 (370) (516) (734) (3,192) (618) (1,092) (1,119) (956) (6,021) 13,935
Other operating income 2,145 1,697 9,947 1,930 (576) 7,123 1,986 1,710 15,719 10,243 9,556
Other operating expense 23,824 23,708 24,248 25,939 21,685 21,437 20,624 22,093 97,719 85,839 80,576
Income before income tax expense 17,073 17,669 24,355 14,279 18,045 18,261 19,283 17,223 73,376 72,812 60,708
Income tax expense 5,439 6,661 9,521 5,546 6,988 7,060 7,598 6,927 27,167 28,573 22,956
Net income $ 11,634 $ 11,008 $ 14,834 $ 8,733 $ 11,057 $ 11,201 $ 11,685 $ 10,296 $ 46,209 $ 44,239 $ 37,752
Basic earnings per common share (in Dollars per share) $ 0.40 $ 0.38 $ 0.51 $ 0.30 $ 0.38 $ 0.38 $ 0.39 $ 0.34 $ 1.59 $ 1.49 $ 1.26
Diluted earnings per common share (in Dollars per share) 0.40 0.38 0.51 0.30 0.38 0.38 0.39 0.34 $ 1.59 $ 1.48 $ 1.26
Dividends per common share (in Dollars per share) $ 0.16 $ 0.16 $ 0.16 $ 0.16 $ 0.15 $ 0.15 $ 0.15 $ 0.15      
Average common shares outstanding for:                      
Basic earnings per share (in Shares) 28,862 28,927 29,246 29,397 29,343 29,772 30,059 29,984 29,106 29,788 30,047
Diluted earnings per share (in Shares) 28,879 28,946 29,268 29,419 29,366 29,796 30,090 30,022 29,126 29,817 30,073