KOLKATA: Banking services may be hampered on October 22 due to an all-India bank strike called by two large bank unions, while State Bank of India said the impact would be minimum as most of its employees are not members of the participating unions.Other banks such as Bank of Maharashtra and Syndicate Bank have expressed concerns over providing customer services."The bank is taking necessary steps tor smooth functioning of branches on the proposed strike day. However in the event the strike materialises the functioning of the branches/offices may be impacted," Syndicate Bank said in a notice to stock exchanges.All India Bank Employees Association (AIBEA), the largest bank union, and Bank Employees Federation of India (BEFI) have called the strike protesting bank mergers and fall in deposit rates.The other seven bank unions -- three employees' unions and four officers' unions -- which together with AIBEA and BEFI form the United Forum of Bank Unions are not part of the strike call, which is a deviation of their standard practice."The membership of our bank employees in unions participating in strike is very few, so the impact of strike on Banks operation will be minimal," SBI had said in a notice to stock exchanges three days back.AIBEA and BEFI said they are opposing outsourcing of regular and perennial nature of banking jobs, privatization of banking industry while demanded adequate recruitment of clerical and sub staff and stringent steps for recovery of mounting bad loans.Last month, the officers' unions had called a two-day all India bank strike on September 26 and 27 which was later withdrawn.