v3.26.1
Note 10 - Stockholders' Equity - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Beginning balance, loss, net of tax $ 2,986,648 $ 2,865,159 $ 2,925,388 $ 2,845,704
Beginning balance, loss, net of tax 3,046,614 2,886,295 3,046,614 2,886,295
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]        
Beginning balance, loss, net of tax (44,178) (71,747) (54,400) (85,607)
Net unrealized (losses)/gains arising during the period, pre-tax (2,229) 3,585 (3,403) 23,261
Net unrealized (losses)/gains arising during the period, tax (659) 1,060 (1,006) 6,876
Net unrealized (losses)/gains arising during the period, net of tax (1,570) 2,525 (2,397) 16,385
Net unrealized (losses)/gains arising during the period, pre-tax 10,554 0 26,239 0
Reclassification adjustment for net losses/(gains) included in net income, tax 3,120 0 7,756 0
Reclassification adjustment for net losses/(gains) included in net income, net of tax 7,434 0 18,483 0
Beginning balance, loss, net of tax (38,314) (69,222) (38,314) (69,222)
AOCI Attributable to Parent [Member]        
Beginning balance, loss, net of tax (44,178) (71,747) (54,400) (85,607)
Beginning balance, loss, net of tax $ (38,314) $ (69,222) $ (38,314) $ (69,222)