"I opened account with the Regional bank and had to pay $1 to be a shareholder.(Hence Bank bail-inns)"
:"A bank bail-in is a process where a bank uses the money of its unsecured creditors, including depositors and bondholders, to restructure their capital so it can stay afloat. The bank is allowed to convert its debt into equity for the purpose of increasing its capital requirements1. In a bail-in, a bank or other institution's creditors must write off a portion of its debts to save it from insolvency2."
In your example, the $1.00 subscription in the capital of the bank has nothing to do with any eventual bail-in. It is the bond holders and certain depositors (those with deposits above $250.00) that will be affected.
With or without a bail-in, the first to answer will be always the shareholders (your $1) followed, in the case of a bail-in, by its unsecured creditors and in the case of a bailout, by any person or government willing to provide a capital injection.
