@abc.abstractmethod<EOL><INDENT>def get_bank(self, bank_id):<DEDENT>
return<EOL>
Gets the ``Bank`` specified by its ``Id``.

        In plenary mode, the exact ``Id`` is found or a ``NotFound``
        results. Otherwise, the returned ``Bank`` may have a different
        ``Id`` than requested, such as the case where a duplicate ``Id``
        was assigned to a ``Bank`` and retained for compatibility.

        :param bank_id: ``Id`` of the ``Bank``
        :type bank_id: ``osid.id.Id``
        :return: the bank
        :rtype: ``osid.assessment.Bank``
        :raise: ``NotFound`` -- ``bank_id`` not found
        :raise: ``NullArgument`` -- ``bank_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure occurred

        *compliance: mandatory -- This method is must be implemented.*