"One thing I know a lot about is the legal definition of fraud," Justice Arthur Engeron said as he gaveled court into session prior to the start of opening statements.

Engoron opened the proceedings after allowing cameras in to document the scene in the courtroom: Trump, arms folded, flanked by his legal team; Engeron on the bench; and throngs of reporters and spectators in the gallery.

"I've promised to do my best despite my lame attempts at humor," Engeron said in a brief opening statement. "I take my job very seriously."

The trial is expected to last through Dec. 22, Engeron said, and suggested he would attempt to keep a low profile after today.

"For the next three months, I hope the only words I will mutter are 'Sustained,' 'Overruled,' and 'Let's take a 10-minute break,'" he said.

Opening statements are underway in former President Trump's $250 million fraud trial.

Trump is seated between his attorneys Clifford Robert, Alina Habba and Christopher Kise.

Trump and his co-defendants face a bench trial, meaning that the sole arbiter of the case is Judge Arthur Engoron instead of a jury.

Former President Trump has taken a seat in the courtroom for the start of the trial.

"The crime is against me," he told reporters outside the courtroom before he made his way inside.

He denounced the case in now-familiar terms, criticizing state Attorney General Letitia James as she sat inside the courtroom.

Trump also accused Judge Arthur Engoron of failing to account for the full value of his real estate portfolio, asserting his Mar-a-Lago estate is worth "50 to 100 times more" than the judge's decision for partial summary judgment said last week.

"We have other properties, the same thing. So he devalued everything," Trump said. "We have among the greatest properties in the world. and I have to go through this for political reasons."

Engoron decided Trump's statements of financial condition were fraudulent, but Trump said, "We have a clause in the contract that says, essentially, buyer beware."

Former President Trump, speaking to reporters on his arrival at the lower Manhattan courthouse, said the trial is a witch hunt resulting from his standing in the presidential polls.

"This is a continuation of the greatest political witch hunt of all time," he told reporters outside the courtroom.

Trump said he is innocent of the accusations and that his portfolio has a much higher value than what the attorney general alleges.

Deutsche Bank relied on the strength of Donald Trump's "financial profile" when deciding to loan the former president roughly $125 million related to the purchase of the Trump National Doral golf club in 2011, according to retired Deutsche Bank executive Nicholas Haigh.

Haigh testified that because Trump used the golf course and spa as collateral -- relatively "unusual" assets that Deutsche Bank would struggle to sell in the event of a foreclosure -- the bank leaned on the strength of Trump's larger portfolio.

"[Trump] is guaranteeing he will repay our loan -- all the money due on the loan," Haigh said about the terms of the loan. "He is also guaranteeing if the result is losing money, he will pay the cost of that shortfall."

Haigh said that he personally reviewed Trump's statement of financial condition when determining whether to sign off on the loan.

"My conclusion was the client owned a lot of real estate, which was not surprising," Haigh said about his findings after reading Trump's financial statement.

Previous witnesses in the trial have offered insights into how Trump's annual financial statement was drafted, finalized, and provided to banks to fulfill loan obligations. Haigh is the first witness to testify from the perspective of the banks, which considered the statements when deciding whether to do business with Trump.