SQL & PL/SQL

I am new to PL/SQL programming and i've been task to create a simple trigger; see code below:

CREATE OR REPLACE TRIGGER  TRG_ACCT_IDW 
AFTER INSERT ON ACNTGROUPS 
FOR EACH ROW 
BEGIN INSERT 
INTO IDWORKS_HC (ACCOUNT,IDW_CATEGORYNO,GRTYPE) 
VALUES 
(:NEW.ACCOUNT,:NEW.GROUP_,:NEW.TYPE) 
WHERE ACNTGROUPS.TYPE = '1' 
END;

Everything works great without the where clause. Can an 'after insert' trigger have a condition clause? does my code above need reformating? thanks in advance.