This chapter applies to all domestic insurers. Foreign insurers and United States branches of alien insurers transacting an insurance business in this State shall maintain investments of the same general type and character as specified for domestic insurers, except that investments of substantially the same quality as those specified herein, authorized by the law of the insurer's state of domicile, or state of entry if an alien insurer, may be recognized as eligible investments for purposes of this chapter by the director or his designee in the sound exercise of his discretion.