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Note 21 - Parent Company Financial Information - Condensed Statements of Cash Flows (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
Net income $ 10,555 $ 12,608 $ 13,403 $ 14,602 $ 11,550 $ 8,266 $ 8,238 $ 7,872 $ 51,168 $ 35,926 $ 38,802
Decrease (increase) in other operating activities                 1,300 (6,662) 7,003
Net cash provided by operating activities                 48,215 45,844 56,655
Investing activities                      
Payments to acquire securities available for sale                 (22,394) (10,267) (8,255)
Net cash provided by investing activities                 35,350 17,798 171,377
Payments for repurchase of common stock                 28,882 21,872 16,362
Payments of common stock dividends                 (18,059) (17,876) (15,060)
Net Cash Provided by (Used in) Financing Activities, Total                 137,313 175,910 (87,896)
Parent Company [Member]                      
Net income                 51,168 35,926 38,802
Decrease (increase) in other operating activities                 253 1,047 1,865
Net cash provided by operating activities                 51,421 36,973 40,667
Investing activities                      
Payments to acquire securities available for sale                 (9,919) 0 0
Dividends in excess of undistributed net income of subsidiaries                 1,305 (13,284) (1,002)
Net cash provided by investing activities                 (8,614) (13,284) (1,002)
Proceeds from issuance of common stock                 0 0 136
Payments for repurchase of common stock                 (28,882) (21,872) (16,362)
Payments of common stock dividends                 (18,059) (17,876) (15,060)
Net change in other financing activities                 1,773 2,150 1,893
Net Cash Provided by (Used in) Financing Activities, Total                 (45,168) (37,598) (29,393)
Net increase (decrease) in cash and cash equivalents                 (2,361) (13,909) 10,272
Cash and cash equivalents at beginning of period       $ 10,089       $ 23,998 10,089 23,998 13,726
Cash and cash equivalents at end of period $ 7,728       $ 10,089       $ 7,728 $ 10,089 $ 23,998