Note 17 - Stockholders' Equity - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Beginning balance, loss, net of tax	$ 2,865,159	$ 2,778,072	$ 2,845,704	$ 2,736,575
Total other comprehensive (loss)/income, net of tax	2,525	(781)	16,385	(7,644)
Ending balance, loss, net of tax	2,886,295	2,793,242	2,886,295	2,793,242
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Beginning balance, loss, net of tax	(71,747)	(92,612)	(85,607)	(86,190)
Net unrealized (losses)/gains arising during the period, pre-tax	3,585	(636)	23,261	(9,753)
Net unrealized (losses)/gains arising during the period, tax	1,060	(188)	6,876	(2,883)
Net unrealized (losses)/gains arising during the period, net of tax	2,525	(448)	16,385	(6,870)
Net unrealized (losses)/gains arising during the period, pre-tax	0	0	0	0
Reclassification adjustment for net losses/(gains) included in net income, tax	0	0	0	0
Reclassification adjustment for net losses/(gains) included in net income, net of tax	0	0	0	0
Total other comprehensive (loss)/income, pre-tax	3,585	(636)	23,261	(9,753)
Total other comprehensive (loss)/income, tax	1,060	(188)	6,876	(2,883)
Total other comprehensive (loss)/income, net of tax	2,525	(448)	16,385	(6,870)
Ending balance, loss, net of tax	(69,222)	(93,060)	(69,222)	(93,060)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Beginning balance, loss, net of tax	0	333	0	774
Net unrealized (losses)/gains arising during the period, pre-tax	0	(473)	0	(1,099)
Net unrealized (losses)/gains arising during the period, tax	0	(140)	0	(325)
Net unrealized (losses)/gains arising during the period, net of tax	0	(333)	0	(774)
Net unrealized (losses)/gains arising during the period, pre-tax	0	0	0	0
Reclassification adjustment for net losses/(gains) included in net income, tax	0	0	0	0
Reclassification adjustment for net losses/(gains) included in net income, net of tax	0	0	0	0
Total other comprehensive (loss)/income, pre-tax	0	(473)	0	(1,099)
Total other comprehensive (loss)/income, tax	0	(140)	0	(325)
Total other comprehensive (loss)/income, net of tax	0	(333)	0	(774)
Ending balance, loss, net of tax	0	0	0	0
AOCI Attributable to Parent [Member]
Beginning balance, loss, net of tax	(71,747)	(92,279)	(85,607)	(85,416)
Net unrealized (losses)/gains arising during the period, pre-tax	3,585	(1,109)	23,261	(10,852)
Net unrealized (losses)/gains arising during the period, tax	1,060	(328)	6,876	(3,208)
Net unrealized (losses)/gains arising during the period, net of tax	2,525	(781)	16,385	(7,644)
Net unrealized (losses)/gains arising during the period, pre-tax	0	0	0	0
Reclassification adjustment for net losses/(gains) included in net income, tax	0	0	0	0
Reclassification adjustment for net losses/(gains) included in net income, net of tax	0	0	0	0
Total other comprehensive (loss)/income, pre-tax	3,585	(1,109)	23,261	(10,852)
Total other comprehensive (loss)/income, tax	1,060	(328)	6,876	(3,208)
Total other comprehensive (loss)/income, net of tax	2,525	(781)	16,385	(7,644)
Ending balance, loss, net of tax	$ (69,222)	$ (93,060)	$ (69,222)	$ (93,060)

CATHAY GENERAL BANCORP 10-Q