WASHINGTON — Although Platinum Community Bank was troubled before it was bought by the mortgage lender Taylor, Bean and Whitaker Mortgage Corp. last year, questions are growing about whether the parent company caused the downfall of its subsidiary — and why regulators let it happen.

The Rolling Meadows, Ill., thrift was shut Sept. 4 by the Office of Thrift Supervision, just over a week after Taylor Bean declared bankruptcy; the failure came after some unusual transactions between the two.

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