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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, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net income $ 11,784 $ 14,640 $ 9,814 $ 11,782 $ 12,583 $ 13,351 $ 11,213 $ 9,515 $ 48,020 $ 46,662 $ 51,168
Decrease in other operating activities                 4,233 3,671 1,300
Net cash provided by operating activities                 61,828 59,024 48,215
Investing activities                      
Payments to acquire securities available for sale                 (74,103) (269,337) (22,394)
Net cash (used) provided by investing activities                 288,662 (536,779) 35,350
Financing activities                      
Payments for repurchase of common stock                 23,038 21,311 28,882
Payments of common stock dividends                 (21,089) (18,515) (18,059)
Net cash (used) provided by financing activities                 (404,916) (28,838) 137,313
Cash and cash equivalents increase (decrease)                 (54,426) (506,593) 220,878
Cash and cash equivalents at beginning of period       170,846       677,439 170,846 677,439 456,561
Cash and cash equivalents at end of period 116,420       170,846       116,420 170,846 677,439
Parent Company [Member]                      
Net income                 48,020 46,662 51,168
Decrease in other operating activities                 (3,275) 8,442 253
Net cash provided by operating activities                 44,745 55,104 51,421
Investing activities                      
Payments to acquire securities available for sale                 (69,469) (19,372) 0
Proceeds from maturities, calls, sales of investment securities                 65,250 11,807 (9,919)
Dividends in excess of undistributed net income of subsidiaries                 0 0 1,305
Net cash (used) provided by investing activities                 (4,219) (7,565) (8,614)
Financing activities                      
Proceeds from issuance of common stock                 91 172 0
Payments for repurchase of common stock                 (23,038) (21,311) (28,882)
Payments of common stock dividends                 (21,089) (18,515) (18,059)
Net change in other financing activities                 1,203 1,375 1,773
Net cash (used) provided by financing activities                 (42,833) (38,279) (45,168)
Cash and cash equivalents increase (decrease)                 (2,307) 9,260 (2,361)
Cash and cash equivalents at beginning of period       $ 16,988       $ 7,728 16,988 7,728 10,089
Cash and cash equivalents at end of period $ 14,681       $ 16,988       $ 14,681 $ 16,988 $ 7,728