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Note 16 - Accumulated Other Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net gain (loss) on sale of securities $ (43) $ (618) $ (43) $ (618) $ (661)
Income before income taxes 12,397 11,736 13,402 12,261 11,902 10,218 11,566 11,436 49,796 45,122 42,113
Income tax benefit 2,833 2,580 2,951 2,630 2,596 1,118 2,500 2,568 10,994 8,782 20,628
Net income $ 9,564 $ 9,156 $ 10,451 $ 9,631 $ 9,306 $ 9,100 $ 9,066 $ 8,868 38,802 36,340 21,485
Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Net income                 254 713 575
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]                      
Net gain (loss) on sale of securities                 43 618 661
Income before income taxes                 43 618 661
Income tax benefit                 (9) (130) (248)
Net income                 34 488 413
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]                      
Other operating expense                 257 228 228
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]                      
Other operating expense                 21 57 31
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                      
Income before income taxes                 278 285 259
Income tax benefit                 (58) (60) (97)
Net income                 $ 220 $ 225 $ 162