Your medical insurance provider can be a good source of references in your area, as can local psychologists, especially those who specialize in workplace issues.
When I was with a bank and searching for EAP providers, I prepared an RFP and sent it to several potential companies. By preparing an RFP, you can specify what your bank's needs are.
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Gayla R. Sherry, SPHR, CMC
President, Gayla R. Sherry Associates, Inc.
Helping organizations improve employee morale, retention and productivity
HR Consulting and Compliance; Training, Conflict Resolution, Internal Investigations, Expert Witness