Interviews with two dozen former employees, mortgage brokers, real estate agents and appraisers reveal the relentless pressure to churn out loans that produced such results. While that sample may not fully represent a bank with tens of thousands of people, it does reflect the views of employees in WaMu mortgage operations in California, Florida, Illinois and Texas.

Their accounts are consistent with those of 89 other former employees who are confidential witnesses in a class action filed against WaMu in federal court in Seattle by former shareholders.

According to these accounts, pressure to keep lending emanated from the top, where executives profited from the swift expansion  not least, Kerry K. Killinger, who was WaMu’s chief executive from 1990 until he was forced out in September.

Between 2001 and 2007, Mr. Killinger received compensation of $88 million, according to the Corporate Library, a research firm. He declined to respond to a list of questions, and his spokesman said he was unavailable for an interview.

During Mr. Killinger’s tenure, WaMu pressed sales agents to pump out loans while disregarding borrowers’ incomes and assets, according to former employees. The bank set up what insiders described as a system of dubious legality that enabled real estate agents to collect fees of more than $10,000 for bringing in borrowers, sometimes making the agents more beholden to WaMu than they were to their clients.

WaMu gave mortgage brokers handsome commissions for selling the riskiest loans, which carried higher fees, bolstering profits and ultimately the compensation of the bank’s executives. WaMu pressured appraisers to provide inflated property values that made loans appear less risky, enabling Wall Street to bundle them more easily for sale to investors.

“It was the Wild West,” said Steven M. Knobel, a founder of an appraisal company, Mitchell, Maxwell & Jackson, that did business with WaMu until 2007. “If you were alive, they would give you a loan. Actually, I think if you were dead, they would still give you a loan.”