Ideally, you should consult a dictionary of financial terminology. Briefly, assets are things of value, for example money, that the bank owns, and liabilities are debts that the bank has to pay to other people or institutions. If the two are out of balance, it means that the bank has taken on too much business in relation to its capital.

"Assets" are the things a bank owns, the things that have a "positive" value to them, like cash and outstanding loans. "Liabilities" are the opposite, the things that have "negative" value, the things that the bank owes to someone, like the value of money deposited. They don't balance because there us also a category called "owners' equity" or just "equity". It's the value of investments in the business and accumulated profits over time. So, the equation that does balance is assets = liabilities + equity.

Liabilities are what the bank owes and assets are the property the bank owns. I'm not sure I understand your question though. Assets should exceed liabilities.