First Security Corp. said Thursday that it and its subsidiary, California State Bank, have agreed to acquire Marine National Bank based in Irvine, Calif.

Terms of the cash deal were not disclosed.Marine National, acquired by Shinhan Bank in 1996, has $238 million in assets, $31 million in equity and $167 million in deposits. It has branches in Irvine, Orange and Newport Beach in Orange County. It has been in business since 1981.