Bonds?? Very broad animal from unit linked to Tracker to deposit to secured to subordinated to perpetual.
I will presume that you are describing some sort of long dated debt instrument issued by the bank which ranks after normal deposits in a winding up and which pays semi annual coupons calculated on the nominal value of the bonds for some term and then the nominal value is repaid at maturity.
Shares are "equity" i.e. they get what's left after all creditors have been paid their interest and after all expenses, and in the case of a winding up they get what's left, if anything, after all creditors including bondholders have been paid. They are the last in line and so are in a sense super geared - if things go well they get magnified returns and if they do bad they tank.
A "vanilla" bond should get exactly what it says on the tin e.g. 6% p.a. for 10 years and then the nominal repaid, unless there is an insolvency beforehand in which case bondholders join the queue behind depositors but of course ahead of shareholders. Prior to maturity bonds can be traded in the market, which will reflect the underlying terms but using current interest rates and also having regard to the possibility of default and so the market value will usually differ from the nominal value, it can be higher or lower. Credit agencies specialise in quantifying the risk of default. Despite recent negative vibes all the main Irish banks have solid credit ratings for their long term debt (bonds).