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Note 8 - Comprehensive Income - Reclassification out of Accumulated Other Comprehensive (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Interest income (expense) $ 102,017 $ 60,887 $ 246,656 $ 182,626
Income tax expense 16,277 6,022 18,449 18,588
Net income 40,976 17,161 40,925 53,422
Salaries and employee benefits 32,401 22,957 80,212 67,809
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Net income 3,385 4,014 9,575 12,084
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Interest income (expense) 4,709 5,624 13,319 16,936
Income tax expense (1,324) (1,580) (3,744) (4,760)
Net income 3,385 4,044 9,575 12,176
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Salaries and employee benefits 0 (43) 0 (129)
Reclassification out of Accumulated Other Comprehensive Income [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]        
Income tax expense 0 13 0 37
Net income $ 0 $ (30) $ 0 $ (92)