Internally, the sales pressure was oppressive, particularly in California and Arizona, where senior bankers sometimes called subordinates several times a day to chastise those who failed to meet sales objectives.
Tolstedt was perceived by high-level employees as having the support of Stumpf, with whom it was considered best to avoid raising problems with.
"Stumpf was ultimately responsible for enterprise risk management at Wells Fargo, but was not perceived within Wells Fargo as someone who wanted to hear bad news or deal with conflict," the report said.
Wells Fargo shares were up 0.2 percent at $54.95 in morning trading.
Additional reporting by David Henry, Elizabeth Dilts and Karen Freifeld in New York and Ross Kerber in Boston.
This article was provided by Reuters.