Even though "credit" has the common sense meaning of "raising the balance," it has a very specific meaning in accounting and does not necessarily mean what common sense says it does. For asset accounts, "credit" means a reduction in the balance.
When you deposit cash into a savings account, you are "credited" that amount. That is from the bank's perspective. Your account is a liability to them -- they owe you, at some time, the balance in that account. So what they are doing is increasing that liability balance or crediting it.
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