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Note 21 - Parent Company Financial Information - Condensed Statements of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other operating expense                 $ 11,737 $ 12,410 $ 11,929
Income tax expense $ 3,037 $ 3,816 $ 4,077 $ 4,430 $ 3,389 $ 2,332 $ 2,270 $ 2,195 15,360 10,186 10,994
Net income $ 10,555 $ 12,608 $ 13,403 $ 14,602 $ 11,550 $ 8,266 $ 8,238 $ 7,872 51,168 35,926 38,802
Parent Company [Member]                      
Cash dividends received from subsidiary bank                 53,200 23,710 38,500
Other income                 8 3 444
Other operating expense                 1,086 1,446 1,420
Income before income taxes and equity in undistributed net income of subsidiaries                 52,122 22,267 37,524
Income tax expense                 (351) (375) (276)
Income before equity in undistributed net income of subsidiaries                 52,473 22,642 37,800
Equity in (dividends in excess) of undistributed net income of subsidiaries                 (1,305) 13,284 1,002
Net income                 $ 51,168 $ 35,926 $ 38,802