There is no consolidated conclusion on what Ideal body weight should be defined, many authorities generalize the ideal body weight as a BMI of 19.5.
A healthy weight is one at which you are comfortable, free of weight-related diseases (such as high blood pressure, heart disease, and diabetes), and not likely to develop these diseases in the future.
It is of prime importance to keep a check on your weight, because your excess body weight can become a serious cause of concern, as it can give rise to several weight related health problems like stroke, adult-onset diabetes (Type 2), sleep apnea, urinary stress incontinence, hypertension and many more.