The missing $8,000 will lead to an investigation, not to anybody’s immediate arrest. In real life, things would move about a thousand times more slowly than they did in the movie.
We aren’t told whether Mr. Bank Examiner, who wants to get back to his family in Elmira, is (a) a private auditor hired by the Building & Loan Board of Directors; (b) a state savings and loan examiner, working for whatever agency regulates state-chartered S&L’s in the home state of Bedford Falls; or (c) an examiner for the Federal Savings & Loan Insurance Corporation, which insured S&L deposits and added some minimal oversight. The most likely possibility is (b).
So the state examiner finds $8,000 missing, and seems suspicious because he’s naturally grumpy, and because George accepted a collect call from a strumpet, and maybe because Potter is whispering in his ear. It’s time to start taking depositions—after the New Year, of course. What is George’s explanation for the missing money? Do George and Uncle Billy tell the same story? What are the S&L’s controls? Has this happened before? What is George’s reputation in the community? Is there evidence of him living beyond his means?
At that point, if the examiner has evidence of fraud, he can refer the matter to the state Attorney General for prosecution, and George will be arrested. He may be empowered to take regulatory action—to freeze the S&L assets, or suspend George from management, or so forth. But regulators tread carefully in such matters because too much bad publicity will cause a run on the S&L.
If the story of accidental loss checks out—as obviously, it will—there still might be consequences, although prosecution isn’t likely to be one of them unless management has been grossly and chronically negligent. The examiner might mandate new internal controls, or (again) recommend changes in management, or simply refer the matter to the Board of Directors for appropriate action. The problem will be documented and conceivably the documentation could provide grist for a civil lawsuit by Potter or some disgruntled stakeholder in the Building & Loan. Having the community replace the lost money won’t necessarily forestall any of these consequences, although it would provide evidence that the lost money was a one-off and not a symptom of chronic negligence.
Finally, remember that Potter has been scheming to get control of the Building & Loan for years, and he can do so at any time by vote of the Board of Directors. If George even falls under suspicion, and loses the trust of the community, such a vote is more likely. The mass donation demonstrates that George is still in good favor, and that’s the real point of the weepy sing-along at the end.