Note 21 - Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2021

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, 2021	(In thousands)
Common Equity Tier 1 to Risk-Weighted Assets
Cathay General Bancorp	$	2,056,601		12.80	$	1,124,381		7.00	$	1,044,068		6.50
Cathay Bank		2,137,925		13.32		1,123,721		7.00		1,043,455		6.50
Tier 1 Capital to Risk-Weighted Assets
Cathay General Bancorp		2,056,601		12.80		1,365,320		8.50		1,285,007		8.00
Cathay Bank		2,137,925		13.32		1,364,519		8.50		1,284,253		8.00
Total Capital to Risk-Weighted Assets
Cathay General Bancorp		2,315,358		14.41		1,686,572		10.50		1,606,259		10.00
Cathay Bank		2,281,182		14.21		1,685,582		10.50		1,605,316		10.00
Leverage Ratio
Cathay General Bancorp		2,056,601		10.40		791,226		4.00		989,033		5.00
Cathay Bank		2,137,925		10.82		790,430		4.00		988,037		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, 2020	(In thousands)
Common Equity Tier 1 to Risk-Weighted Assets
Cathay General Bancorp	$	2,016,448		13.53	$	1,042,967		7.00	$	968,470		6.50
Cathay Bank		2,059,056		13.83		1,041,911		7.00		967,489		6.50
Tier 1 Capital to Risk-Weighted Assets
Cathay General Bancorp		2,016,448		13.53		1,266,460		8.50		1,191,963		8.00
Cathay Bank		2,059,056		13.83		1,265,178		8.50		1,190,755		8.00
Total Capital to Risk-Weighted Assets
Cathay General Bancorp		2,304,366		15.47		1,564,451		10.50		1,489,953		10.00
Cathay Bank		2,231,474		14.99		1,562,866		10.50		1,488,444		10.00
Leverage Ratio
Cathay General Bancorp		2,016,448		10.94		737,382		4.00		921,727		5.00
Cathay Bank		2,059,056		11.19		736,317		4.00		920,396		5.00