Feb 2 (Reuters) - Shares in Japan's Aozora Bank collapsed to a three-year low in helter-skelter selling on Friday, with investors fleeing following a huge loss provision against U.S. office loans.

The stock dropped more than 18% in early trade before steadying at 2,164 yen ($14.79). Trade volumes were a record. and the bank lost a third of its value, or more than $870 million in market value, in two days.

The provision came on the heels of New York Community Bancorp booking a big charge against its bad property-related loans. That has sent U.S. regional banking stocks into a tailspin reminiscent of last year's collapse of Signature and Silicon Valley Banks.

($1 = 146.3400 yen) (Reporting by Tom Westbrook; Editing by Jacqueline Wong)