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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, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net income $ 12,583 $ 13,351 $ 11,213 $ 9,515 $ 10,555 $ 12,608 $ 13,403 $ 14,602 $ 46,662 $ 51,168 $ 35,926
Decrease (increase) in other operating activities                 3,671 1,300 (6,662)
Net cash provided by operating activities                 59,024 48,215 45,844
Investing activities                      
Payments to acquire securities available for sale                 (269,337) (22,394) (10,267)
Net cash provided by investing activities                 (536,779) 35,350 17,798
Financing activities                      
Payments for repurchase of common stock                 21,311 28,882 21,872
Payments of common stock dividends                 (18,515) (18,059) (17,876)
Net Cash Provided by (Used in) Financing Activities, Total                 (28,838) 137,313 175,910
Cash and cash equivalents increase (decrease)                 (506,593) 220,878 239,552
Cash and cash equivalents at beginning of period       677,439       456,561 677,439 456,561 217,009
Cash and cash equivalents at end of period 170,846       677,439       170,846 677,439 456,561
Parent Company [Member]                      
Net income                 46,662 51,168 35,926
Decrease (increase) in other operating activities                 8,442 253 1,047
Net cash provided by operating activities                 55,104 51,421 36,973
Investing activities                      
Payments to acquire securities available for sale                 (19,372) 0 0
Proceeds from maturities, calls, sales of investment securities                 11,807 (9,919) 0
Dividends in excess of undistributed net income of subsidiaries                 0 1,305 (13,284)
Net cash provided by investing activities                 (7,565) (8,614) (13,284)
Financing activities                      
Proceeds from issuance of common stock                 172 0 0
Payments for repurchase of common stock                 (21,311) (28,882) (21,872)
Payments of common stock dividends                 (18,515) (18,059) (17,876)
Net change in other financing activities                 1,375 1,773 2,150
Net Cash Provided by (Used in) Financing Activities, Total                 (38,279) (45,168) (37,598)
Cash and cash equivalents increase (decrease)                 9,260 (2,361) (13,909)
Cash and cash equivalents at beginning of period       $ 7,728       $ 10,089 7,728 10,089 23,998
Cash and cash equivalents at end of period $ 16,988       $ 7,728       $ 16,988 $ 7,728 $ 10,089