Note 21 - Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020	(Dollars 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

	Actual				Minimum Capital Required - Basel III				Required to be Considered Well Capitalized
	Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio
December 31, 2019	(Dollars in thousands)
Common Equity Tier 1 to Risk-Weighted Assets
Cathay General Bancorp	$	1,892,321		12.51	$	1,059,259		7.00	$	983,597		6.50
Cathay Bank		1,959,832		12.97		1,057,880		7.00		982,318		6.50
Tier 1 Capital to Risk-Weighted Assets
Cathay General Bancorp		1,892,321		12.51		1,286,243		8.50		1,210,581		8.00
Cathay Bank		1,959,832		12.97		1,284,569		8.50		1,209,006		8.00
Total Capital to Risk-Weighted Assets
Cathay General Bancorp		2,134,900		14.11		1,588,888		10.50		1,513,227		10.00
Cathay Bank		2,086,911		13.81		1,586,821		10.50		1,511,258		10.00
Leverage Ratio
Cathay General Bancorp		1,892,321		10.83		699,173		4.00		873,966		5.00
Cathay Bank		1,959,832		11.23		697,976		4.00		872,470		5.00