Gilbert, If you go with that logic, no-one would ever have a mortgage again (Freddie Mac, Fannie May), or put any money in any bank (Northern Rock, Merrill Lynch) either. Or, for that matter fly in a plane, drive a car or cross the road or visit Greece. Seriously, check out Generali. Strong, stable, reputable, profitable.
The only reason a bank is offering these sort of rates is because it needs the money. It is unsustainable economically. All I can say is, that throughout the world, offering a susbstantially inflated savings rate is a strong signal that a bank is just not financially secure. Basic point, why would they want to offer savers 20% when 7% would be seen as fantastic at the moment? - It could just be generousity, but I really doubt it - it doesn't make sense.
Banks should hold at least 8% of capital as a resverve. Most hold back more and the requirement is being increased in the UK and US. I found a document which says the minimum holding for local sharia banks in Indonesia is also a minimum 8%. I recommend that you ask your bank exactly what percentage of its capital is held as a reserve and are your savings underwritten by the government of Indonesia should the bank go under? In almost all developed regulated economies, the government taxes all financial services providers to set up a fund to underwrite savings. In the UK its called the FSCS (Financial Services Compansation Scheme) and it guarantees savings up to 85,000 pounds. If a bank goes under, this amount is safe for each UK saver. Good job if you were with Northern Rock. I can find no information about a similar guarantee in Indonesia. That doesn't mean it doesn't exist. It might, but you'll need to ask the bank. I wish you luck with it mate and I hope it works out for you.
Final point - the reason that professional Financial Advisors recommend the investment platforms we recommend is that we know that these are the best way available, in the world, the both protect our clients investments and make their money grow, so that our clients can meet their goals, whether that is, making their money work harder to increase their wealth, making sure they can afford to have their children properly educated or having sufficient money to support themselves when they are older. This, along with making sure that people are properly insured with regards to health and life, is what we do. We do it to the best of our professional ability. Why would we do anything else? There is nothing to be gained by giving bad advice, poor service and behaving dishonestly - just ask Bernie. Equally, there are many many millions of people ensuring their security by taking advantage of professional advice and consistently performing investments, which, while all of these institutions were going bust in the recession, kept on making their investors money.