Yes, many print vendors do add masking to account numbers on our regular statements.  The flat file that we provide to the print vendor does not, of course, mask the account number so it's up to the print vendor to apply that masking as requested by the CU.  Sage Direct, the vendor that is used by the majority of CU*Answers online clients, is able to mask account numbers upon request.  This includes transfer account numbers that appear in the transaction detail) on regular account, mortgage, and credit card statements,  Contact Sage Direct or your print vendor for details.