My mortgage loan is term loan for 34 years. If i pay more than installment, will it reduce principal amount and save interest charge?

Last time my HLB house loan got 2 accounts. One is loan account and another is normal savings account. The loan is paid through the savings account so whatever extra I put in the savings account goes towards reducing the interest. So if I took a loan for 300k but have 200k in the savings I will only be charged interest on the 100k. Monthly loan payment remain the same so effectively I was paying off the principal loan faster. Actually managed to settle my house loan within 10 years for a 30 year loan.