The company's founding shareholders, Mr Elvidge and Mr Gifford, were caught up in the fallout.
Four months after their former colleague was sent to prison, the two were forced to sell their houses.
The former directors say ASB should not have honoured cheques drawn by the fraudster.
In their most recent claim, Associate Judge Rob Osborne fixed security costs at $62,500, foiling their ability to continue the court fight.
They returned to the High Court, arguing before Associate Judge Roger Bell that Judge Osborne's decision was obtained improperly because the ASB had failed to disclose relevant documents, in particular a letter instructing the bank the signatories to a new account could be any of Pioneer's three directors but not Mr Fitzsimons.
In a recent decision, Judge Bell found the bank had acted with "gross impropriety".
"There was a badly flawed error in judgment in believing the exclusion of information could be justified by resort to a flimsy argument alleging irrelevance."
An ASB spokesperson said the bank was "surprised and disappointed" by the judge's findings.
"We do not agree with his comment that the bank acted with impropriety. We are reviewing the judgment and assessing our appeal options."
The spokesperson would not comment further.
Mr Elvidge told Hawke's Bay Today he could not comment on the particulars as the case was still sub judice, but he was "obviously pleased" with Judge Bell's decision.
A spokesman for Mr Elvidge added it was "an extremely telling decision against the bank".
"It's been a long time with considerable stress.
"It's a relief because it allows [Mr Elvidge and Mr Gifford] to get a proper hearing on all outstanding matters and get them resolved."