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Note 22 - Parent Company Financial Information - Condensed Statements of Income (Details) - USD ($)
$ 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
Other operating expense                 $ 21,099 $ 19,947 $ 21,111
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                 21,485 25,126 24,540
Dividends on preferred stock                 105
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
Parent Company [Member]                      
Cash dividends received from subsidiary bank                 22,720 32,000 22,970
Other income (expense)                 352 (1,121) 1,039
Other operating expense                 2,044 2,097 2,080
Income before income taxes and equity in undistributed net income of subsidiaries                 21,028 28,782 21,929
Income tax expense                 (678) (1,287) (616)
Income before equity in undistributed net income of subsidiaries                 21,706 30,069 22,545
(Dividends in excess of) equity in undistributed net income of subsidiaries                 (221) (4,943) 1,995
Net income                 21,485 25,126 24,540
Dividends on preferred stock                 105
Net income available to common shareholders                 $ 21,485 $ 25,126 $ 24,435