CiviContribute "Held For Review"
While researching another issue I stumbled across this on JIRA: https://issues.civicrm.org/jira/browse/CRM-17779 - so as of 4.7.9, it looks as if you will be able to update the pending contribution to completed (haven't tested, but you should test both online and offline contributions to see what happens).

Kind regards,
Tamar