Neither this act nor anything herein contained is or shall be construed as a restriction or limitation upon any powers which the bank might otherwise have under any laws of this state, and this act is cumulative to any such powers. This act does and shall be construed to provide complete additional and alternative method for the doing of the things authorized thereby and shall be regarded as supplemental and additional to powers conferred by other laws. No proceedings, notice or approval shall be required for the issuance of any bonds, notes and other obligations or any instrument as security therefor, except as in this act.