J.P. Morgan Chase & Co. is loosening its underwriting criteria for big mortgages, as lenders ramp up competition to grab a bigger share of the high-end housing market.

The nation's largest bank plans to announce as soon as Tuesday that it is lowering the minimum credit score and down payment it requires for mortgages as big as $3 million.

The New York firm's moves follow similar steps at Bank of America Corp., Wells Fargo & Co. and other banks for requirements on jumbo mortgages—those that exceed $417,000 in most parts of the country or $625,500 in pricier markets. At the same time, some big banks are backing away from smaller loans where they see higher regulatory costs and litigation risks.

Since the financial crisis, a recovery in the mortgage market has faced several challenges, but the jumbo market—popular with well-heeled borrowers—has bounced back along with sales of higher-priced homes. In the second quarter, overall jumbo originations rose to an eight-year high of $93 billion, up 58% from a year ago, according to a preliminary estimate from industry newsletter Inside Mortgage Finance.

By dollar volume, jumbo mortgages given out by lenders last year accounted for about 20% of all first-lien mortgages, used mostly to purchase or refinance a home, according to Inside Mortgage Finance. That is up from 5.5% in 2009. The last time jumbo mortgages accounted for a larger share was in 2005.

"There's no question that the jumbo market has probably recovered more than any sector of the mortgage market since the housing crisis,"said Guy Cecala, publisher of Inside Mortgage Finance.

Lenders have more flexibility to change criteria for jumbo mortgages, as they generally hold on them their own books rather than selling the loans to mortgage-finance giants Fannie Mae and Freddie Mac, which have their own criteria.

For jumbo mortgages, J.P. Morgan plans to lower the minimum FICO credit scores it requires to 680 from 740 for loans on primary single-family purchases, second homes, and certain refinances on those properties.

The moves by J.P. Morgan are in some ways more aggressive than those of its peers. The bank is allowing a 15% down payment for loans up to $3 million, compared with Bank of America and PNC Financial Services Group Inc., which permit a 15% down payment for jumbo loans of up to $1 million and $1.5 million, respectively.

"In some cases, our customers have been helped by other banks that have different guidelines," said Sean Grzebin, head of retail mortgage lending at J.P. Morgan. "Some of this is [about] retaining customers we should have gotten and we hadn't because of program restrictions."

The increase in jumbo lending underscores a housing recovery that has been more favorable to higher-priced homes. Sales of existing single-family homes priced between $750,000 and $1 million, for example, increased 21% in June from a year prior, according to the National Association of Realtors. Sales of homes priced between $100,000 and $250,000, in contrast, increased 12.5%, while those priced lower fell 3%.

"The upper end of the segment has improved quite a bit," said Sam Khater, deputy chief economist at CoreLogic, a real-estate information firm. The improvement is in part because banks are giving out more jumbo loans, as well as the recovery of the stock market, which is highly correlated to jumbo mortgage demand, he said

Rising home values have helped give lenders confidence that lower down payments won't leave borrowers at risk of owing more on their homes than they will eventually be worth.

In addition, even though banks are easing lending criteria, mortgage industry experts say the market remains much healthier than it was a decade ago, when low standards and poor underwriting practices contributed to a historic plunge in U.S. housing prices. Before the housing bust, jumbo mortgages were widely available with no money down and for borrowers with credit scores below 640, noted Mr. Cecala of Inside Mortgage Finance. Some lenders were also giving out these loans without verifying applicants' income, he said.

In contrast, borrowers who received a jumbo mortgage in May had an average FICO score of 770—the highest since at least the beginning of 2005—and made an average down payment of nearly 32%, according to CoreLogic.

Steve Hemperly, head of mortgage originations at J.P. Morgan, said the bank's decision was largely influenced by the strong performance of the jumbo loans it has given out in recent years. Industrywide, only about 0.8% of outstanding balances from all first-lien mortgages went into default in June, down from 1.23% two years earlier, according to the S&P/Experian Consumer Credit Default Indices.

J.P. Morgan's changes, which go into effect Wednesday, will reduce minimum down payments for some borrowers to 15% of the purchase price for single-family homes serving as the borrower's primary residence, down from 20% currently. That change applies to mortgages between $1.5 million and $3 million; the bank last year made the same change for jumbo mortgages up to $1.5 million.

The bank, the largest in the U.S. by assets, is also lowering down-payment thresholds for jumbo mortgages used for second homes, such as vacation homes and certain two- to four-unit properties. The bank says the changes simplify its offerings.

J.P. Morgan, which ranks second after Wells Fargo in total mortgage origination volume, gave out a total of $87 billion of mortgages last year, accounting for about 7% of total mortgage originations, according to Inside Mortgage Finance. That is down from about 10% the prior two years and 12% in 2011.

Several large banks have recently lowered their jumbo-mortgage requirements. Wells Fargo last year cut its minimum down payment requirement to 10.1% from 15% for jumbo mortgages.

In June, Bank of America began allowing first-time home buyers, which it defines as people who haven't owned a home for at least three years, to make 15% down payments for jumbo mortgages of up to $1 million. The bank previously excluded this group of buyers from its 15% down-payment option, which it rolled out in 2013.

PNC in May switched to 15% minimum down payments for all eligible borrowers for jumbo loans of up to $1.5 million, down from 20% previously. It also recently lowered the minimum required FICO score to 700, compared with 720 a year ago.

In addition to easing standards, lenders have been trying to appeal to borrowers with lower interest rates. Historically, interest rates on jumbos have been higher than on smaller mortgages. That changed last August, when for five weeks the average interest rate on 30-year fixed-rate jumbos fell below the average for the 30-year fixed-rate mortgages that conform to the standards of Fannie and Freddie, according to HSH.com.

While 30-year fixed-rate jumbos on average are no longer cheaper, they are priced very close to their counterparts, with rates averaging 4.07% last week compared with 4.05% for conforming loans.

"The strongest portion of the market is at the high end," said Michael Fratantoni, chief economist at the Mortgage Bankers Association. "You're seeing more lenders in this space…and lower minimum down payment requirements."

Joe Light contributed to this article.

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