To represent the double meaning of "Bank", the form of the bench should correlate with this intention, being not only a blue-orange colored bench.
Smooth and round, appealing form to old and even more: young. Its playful shape breaks up the dry atmosphere of a "common" bank, making it more open and less reserved. Suits ergonomic needs with rounded corners and a soft inward slope. At the center is a real open moneybox-like slot: this symbolically representes the money saving (or better: save money) purpose of a bank. Can even be used as a real moneybox for benefitial purpose.
Graphically it is a reduced form, easy to understand, symbolic and iconic which can be set up as a brand symbol for future marketing campaign identification. Usable as 2D and 3D respresentation with lots of word-play capabilities.
Round form itself can eg. be designed in more coin-like shape - this is open for later refinement.