SunTrust Banks warned that its fourth-quarter financial results will include a $145 million provision for legal expenses related to "legacy mortgage matters."

The company said in a regulatory filing Monday that it is increasing its legal reserve to 17 cents per share for a previously disclosed issue to resolve the matter.

SunTrust Banks Inc. releases fourth-quarter earnings on Jan. 16.

The Atlanta company's stock fell $1.54, or 3.7 percent, to $40.19 in afternoon trading.