config.php

<?php
'factories' => array(
  'My\Service\BankAccount' => function($serviceManager) {
    $bankAccountService = new My\Service\BankAccount($serviceManager->get('Doctrine\ORM\EntityManager')->getRepository('My\Entity\BankAccount'));
    return $bankAccountService;
  },
),

controller.php

<?php

public function indexAction() {
  $service = $this->getServiceLocator()->get('My\Service\BankAccount');
  return new ViewModel(array('account' => $service->find($id)));
}