Note 8 - Loans - Performance of Modified Loans (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Modified	$ 12,095	$ 6,940
Financial Asset, Not Past Due [Member]
Modified	10,485	6,940
Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	1,610	0
Commercial Portfolio Segment [Member]
Modified	7,524	6,719
Commercial Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Modified	5,914	6,719
Commercial Portfolio Segment [Member] \| Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0	0
Commercial Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	1,610	0
Commercial Real Estate Portfolio Segment [Member]
Modified	4,354
Commercial Real Estate Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Modified	4,354
Commercial Real Estate Portfolio Segment [Member] \| Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Commercial Real Estate Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	0
Residential Portfolio Segment [Member]
Modified	217	221
Residential Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Modified	217	221
Residential Portfolio Segment [Member] \| Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Residential Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	$ 0

CATHAY GENERAL BANCORP 10-Q