Note 23 - Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

	Actual				Minimum Capital Required - Basel III				Required to be Considered Well Capitalized
	Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio
December 31, 2023	(In thousands)
Common Equity Tier 1 to Risk-Weighted Assets
Cathay General Bancorp	$	2,430,773		12.84	$	1,325,277		7.00	$	1,230,615		6.50
Cathay Bank		2,501,439		13.23		1,323,846		7.00		1,229,286		6.50
Tier 1 Capital to Risk-Weighted Assets
Cathay General Bancorp		2,430,773		12.84		1,609,265		8.50		1,514,602		8.00
Cathay Bank		2,501,439		13.23		1,607,527		8.50		1,512,967		8.00
Total Capital to Risk-Weighted Assets
Cathay General Bancorp		2,709,888		14.31		1,987,916		10.50		1,893,253		10.00
Cathay Bank		2,665,054		14.09		1,985,769		10.50		1,891,209		10.00
Leverage Ratio
Cathay General Bancorp		2,430,773		10.55		921,473		4.00		1,151,841		5.00
Cathay Bank		2,501,439		10.87		920,670		4.00		1,150,838		5.00

	Actual				Minimum Capital Required - Basel III				Required to be Considered Well Capitalized
	Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio
December 31, 2022	(In thousands)
Common Equity Tier 1 to Risk-Weighted Assets
Cathay General Bancorp	$	2,182,066		12.21	$	1,250,914		7.00	$	1,161,563		6.50
Cathay Bank		2,276,830		12.75		1,250,461		7.00		1,161,142		6.50
Tier 1 Capital to Risk-Weighted Assets
Cathay General Bancorp		2,182,066		12.21		1,518,967		8.50		1,429,616		8.00
Cathay Bank		2,276,830		12.75		1,518,417		8.50		1,429,098		8.00
Total Capital to Risk-Weighted Assets
Cathay General Bancorp		2,452,781		13.73		1,876,371		10.50		1,787,020		10.00
Cathay Bank		2,432,045		13.61		1,875,691		10.50		1,786,373		10.00
Leverage Ratio
Cathay General Bancorp		2,182,066		10.08		865,470		4.00		1,081,838		5.00
Cathay Bank		2,276,830		10.53		864,918		4.00		1,081,148		5.00