Banking in the DR

Hi I am not expat yet, but am planning to moveto DR with my  family in the next couple of years .
I have been to DR several timeas and absolutely love it .
I am doing my home work now and one thing i would love to ask expats :

Banking . I have read in some other bloggs that the DR banks offer between 10 and 25 % interest on investments.

Is it true ? How safe are banks over there ?  Any information on handling your finanace in DR would be greatly appreciated  ?

Thank you !

Irina