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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, 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
Other operating expense                 $ 12,727 $ 11,841 $ 12,264
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
Parent Company [Member]                      
Cash dividends received from subsidiary bank                 48,000 22,720 32,000
Other income (expense)                 306 352 (1,121)
Other operating expense                 2,293 2,044 2,097
Income before income taxes and equity in undistributed net income of subsidiaries                 46,013 21,028 28,782
Income tax expense                 (595) (678) (1,287)
Income before equity in undistributed net income of subsidiaries                 46,608 21,706 30,069
Dividends in excess of undistributed net income of subsidiaries                 (10,268) (221) (4,943)
Net income                 $ 36,340 $ 21,485 $ 25,126