NEW YORK (Dow Jones)--Concerns about the creditworthiness of CIT Group Inc. (CIT) are seeping into broader markets after the commercial lender Friday confirmed that the U.S. Federal Deposit Insurance Corp. has yet to approve its application to issue government-backed debt. The worries about the lender are touching markets from stocks to Treasurys, underscoring how broader credit concerns may be resurfacing after a period of relative calm. Shares of CIT were off nearly 30% Friday before closing down 18%, while most CIT bonds fell, indicating worries about the lender's ability to meet its obligations in the long run. Treasury prices, meanwhile,...