Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock Outstanding [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Treasury Stock, Common [Member]	Total
Balance (in shares) at Dec. 31, 2023	72,668,927
Beginning balance, loss, net of tax at Dec. 31, 2023	$ 914	$ 987,953	$ (85,416)	$ 2,500,341	$ (667,217)	$ 2,736,575
Dividend Reinvestment Plan (in shares)	18,468
Dividend Reinvestment Plan	$ 0	744	0	0	0	744
Restricted stock units vested (in shares)	796
Restricted stock units vested	$ 0	0	0	0	0	0
Stock issued to directors (in shares)	0
Stock issued to directors	$ 0	0	0	0	0	0
Shares withheld related to net share settlement of RSUs	$ 0	(24)	0	0	0	(24)
Purchases of treasury stock (in shares)	0
Stock-based compensation	$ 0	905	0	0	0	905
Cash dividends	0	0	0	(24,708)	0	(24,708)
Other comprehensive income (loss)	0	0	(6,863)	0	0	(6,863)
Net income	$ 0	0	0	71,435	0	71,435
Balance (in shares) at Mar. 31, 2024	72,688,191
Ending balance, loss, net of tax at Mar. 31, 2024	$ 914	989,578	(92,279)	2,547,068	(667,209)	2,778,072
Purchases of treasury stock	0	0	0	0	8	8
Other comprehensive income (loss)	$ 0	0	(6,863)	0	0	(6,863)
Balance (in shares) at Dec. 31, 2024	70,863,324
Beginning balance, loss, net of tax at Dec. 31, 2024	$ 916	993,962	(85,607)	2,688,353	(751,920)	2,845,704
Dividend Reinvestment Plan (in shares)	15,852
Dividend Reinvestment Plan	$ 0	695	0	0	0	695
Restricted stock units vested (in shares)	32,438
Restricted stock units vested	$ 0	0	0	0	0	0
Stock issued to directors (in shares)	0
Stock issued to directors	$ 0	0	0	0	0	0
Shares withheld related to net share settlement of RSUs	$ 0	(791)	0	0	0	(791)
Purchases of treasury stock (in shares)	(876,906)
Purchases of treasury stock	$ 0	0	0	0	(41,465)	(41,465)
Stock-based compensation	0	1,505	0	0	0	1,505
Cash dividends	0	0	0	(23,855)	0	(23,855)
Other comprehensive income (loss)	0	0	13,860	0	0	13,860
Net income	$ 0	0	0	69,506	0	69,506
Balance (in shares) at Mar. 31, 2025	70,034,708
Ending balance, loss, net of tax at Mar. 31, 2025	$ 916	995,371	(71,747)	2,734,004	(793,385)	2,865,159
Other comprehensive income (loss)	$ 0	$ 0	$ 13,860	$ 0	$ 0	$ 13,860

CATHAY GENERAL BANCORP 10-Q