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How much of my home loan is coming from a bank, how much it goes back? 
When you get a loan (car, home, student) the lending company (bank) give the (auto dealer, previous home owner, school) money. You as the borrow promise to pay this money back with interest.  So in your case the 100,000 you borrow requires a payment for principal and interest of ~965 per month. After 240 payments you will have paid the bank ~231,605.  So who got the ~131,000 in interest. The bank did. It was used to pay interest to the people who made deposits into the bank. It was also used to pay the expenses of the bank: salaries, retirement, rent, electricity, computers, etc. If the bank is a company with investors they may have to pay dividends to them to.  Of course not all loans are successfully paid back, so some of the payment goes to cover the loans that are in default. In many cases loans are also refinanced, or the house is sold long before the 20-30 year term is up. In these cases the amount of interest received for that loan is much less than anticipated, but the good news is that it can be loaned out again.