What happened when the money from share issuance is spent? Let's assume that new bank is incorporated and it issued 100 000 shares with nominal value odf $100.
Let's also assume that all shares are sold for the same price, so bank now has 10 million dollars.
In equity section on balance sheet, there is now 10 million dollars of ordinary shares. Now let's assume further that 5 years has passed, the bank has spent all 10 million dollars for different purposes (R&amp;D, expansion etc.) and now it doesn't have that money, but there are still 10 million dollar of ordinary share on its balance sheet.
If ordinary shares are vital part of bank's capital, how can they now respresent someting that can save the bank from bankruprtcy it problems occurs, when there is no money??? I'd understand if the bank wasn't allowed to spend that money, but it is used for various purposes.
You are concerned about...

someting that can save the bank from bankruprtcy it problems occurs,
when there is no money

This is an accounting question as much as an economics question. What you are asking about is &quot;solvency&quot;.

assets minus liabilities equals equity

The bank or any company is solvent by definition if equity is positive and estimated values are realistic. Companies can even be solvent if equity is negative because estimated values are not realistic, for example, if assets are a &quot;conservative&quot; estimate which in this case means assets are underestimated.
You asked about the absence of money. All items in the assets are theoretically convertible to money. They are convertible regardless of the estimate of equity. In practice negative money balances are not necessarily a problem because if equity is large enough the company can obtain a loan. Typically a bank is holding cash because that is the nature of offering &quot;demand&quot; accounts which are the accounts where the depositor can withdraw cash almost immediately.