By Andrew R. Johnson

--Sterling to merge into Umpqua

--Combined company will have $22 billion in assets and about 400 branches

--Deal expected to close in the first half of 2014

Sterling Financial Corp. (STSA) announced Wednesday it will merge into Oregon lender Umpqua Holdings Corp. (UMPQ) in a deal valued at $2 billion, one of the largest bank transactions announced this year.

The deal will form one of the largest community banks on the West Coast, with $22 billion in assets and nearly 400 branches in five states, the companies said late Wednesday.

Sterling, based in Spokane, Wash., will merge into Umpqua Bank, based in Portland. Ray Davis, currently president and chief executive officer of Umpqua Holdings, will continue leading the combined company, while Greg Seibly, president and CEO of Sterling, will become a co-president at Umpqua Bank.

"With our size, shared cultures and financial strength, our combined organization will be uniquely positioned to deliver value for our associates, customers, communities and shareholders," Mr. Davis said in a statement.

Sterling's shares rose 8.3% to $28.76 in after-hours trading Wednesday, while Umpqua's shares were inactive.

Analysts have predicted a wave of consolidation would hit the banking industry as new capital requirements, lending regulations and weak loan demand make it harder for banks to grow profits and pressure them to cut costs.

But there have been few large bank transactions, in part due to concerns over additional regulatory scrutiny such deals could attract to banks, analysts have said.

A deal Buffalo, N.Y.-based lender M&T Bank Corp. (MTB) announced last year to acquire Hudson City Bancorp Inc. (HCBK) for $3.8 billion was delayed after the Federal Reserve in April raised concerns about M&T's antimoney-laundering compliance programs.

The Wall Street Journal reported Monday Umpqua was in talks to buy Sterling.

Umpqua has expanded across the Pacific Northwest and the West Coast through acquisitions in recent years. The bank, which operates about 200 branches in Oregon, Washington, California and Northern Nevada and has some $11 billion in assets, is known for its quirky customer service.

The bank refers to its branches as "neighborhood stores" and tellers and executives answer the phone: "Umpqua Bank--the world's greatest bank." Umpqua reported net earnings of $26 million in the second quarter, up 13% from a year earlier on strong loan growth.

Sterling, with assets of about $10 billion and more than 170 branches, was hard hit by the housing-market downturn and a swell of bad loans. In 2010, it raised $730 million from investors, including private-equity firms Warburg Pincus LLC and Thomas H. Lee Partners LP, its two largest shareholders.

The companies said Thomas H. Lee and Warburg Pincus have agreed to vote in favor of the deal.

Under the deal, Sterling's shareholders will receive 1.671 shares of Umpqua common stock and $2.18 cash for each share of Sterling common stock they own.

The companies said they expect to close the deal in the first half of 2014, pending shareholder and regulatory approvals.

-Ryan Dezember and Kirsten Grind contributed to this story.

Write to Andrew R. Johnson at andrew.r.johnson@dowjones.com

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