By P.R. Venkat and Yvonne Lee 

SINGAPORE-- Oversea-Chinese Banking Corp. has agreed to buy Wing Hang Bank Ltd., a family-owned bank in Hong Kong for close to US$5 billion, the largest acquisition by the Singapore bank on record.

Singapore's second-biggest bank by assets has offered to buy all of Wing Hang Bank's shares for HK$125 (US$16.12) each, which represent about a 1.6% premium to its Friday closing price, OCBC said in a statement Tuesday. In Hong Kong dollar terms, the acquisition would cost OCBC HK$38.43 billion.

The deal comes at a time of consolidation in Hong Kong's banking sector. Late last year, Chinese conglomerate Yuexiu Enterprises struck a deal to buy a majority stake in Hong Kong's Chong Hing Bank for about $1.5 billion. Hong Kong has a handful of family-owned banks competing in a market dominated by the likes of HSBC Holdings PLC and Standard Chartered PLC.

"Hong Kong is fast becoming more competitive given increasing presence of larger banks. Against this backdrop, we expect niche banks will struggle to be meaningfully profitable," Morgan Stanley said in a note.

OCBC and Wing Hang Bank began discussions late last year, and in January entered exclusive talks, which were extended twice as they wrestled over price. Wing Hang Bank's shares last traded at 1.7 times its forecast book value, but investors had expected OCBC to pay a valuation of about 1.9 times to 2 times.

OCBC's acquisition is valued at close to 1.8 times its non-adjusted price to book ratio. On an adjusted basis, which includes dividend payments and property valuations, the value is 2 times to book.

Wing Hang Bank was founded in Guangzhou, the capital of Guangdong province in mainland China, in 1937, by the patriarch of the Fung family. It was moved to Hong Kong after World War II. According to its website, Wing Hang Bank Group had total assets of HK$214.3 billion at the end of December 2013.

For OCBC, buying Wing Hang will significantly boost the Singapore bank's exposure to Greater China, raising its Chinese loans to 25% of the Singapore bank's total, from about 15% currently, UBS analysts estimate. It would also give OCBC a foothold in Macau, which generates about 15% of Wing Hang's pretax profit, as well as access to Greater China trade flows, particularly from Southeast Asia. OCBC is building its presence in China, having bought a 383 million Singapore dollar (US$299 million) stake in Shenzhen-listed Bank of Ningbo Ltd. earlier this year. OCBC's biggest acquisition had been a US$1.46 billion investment it made in 2009, when it bought ING Groep NV's Asian private-banking assets. It rebranded the business as Bank of Singapore.

"Without the opportunity presented by this [Wing Hang] potential acquisition, I would expect OCBC to take a much longer period of time, and encounter greater challengers with less certainty of success," Samuel Tsien, chief executive of OCBC said. Once the deal is completed, the Singapore bank will have access to 70 branches of Wing Hang Bank which includes 42 branches in Hong Kong and 13 in Macau.

Write to P.R. Venkat at venkat.pr@wsj.com

Mr. Tsien said the planned acquisition will also help OCBC benefit from the continued internationalization of the yuan and it expects the deal to be completed by August after getting necessary approvals.

OCBC Chief Financial Officer Darren Tan said his bank is planning to fund the acquisition using a mix of internal resources, equity and debt. He said the bank has yet to decide on the amount of equity it intends to raise for funding Wing Hang. Key shareholders of Wing Hang Bank include the Fung family and BNY International Financing Corp. OCBC said that along with key shareholders, it has so far received acceptances of about 50.66%.

Wing Hang put itself up for sale last year and attracted interest from Singapore's United Overseas Bank Ltd., Australia & New Zealand Banking Group Ltd. and China's Anbang Insurance, people familiar the matter said earlier.

"We believe the offer price represents an attractive opportunity for our shareholders to realize the investment value of Wing Hang," Wing Hang Bank Chairman Patrick Fung said in a statement.

Shares of OCBC and Wing Hang rose Tuesday when it opened for trade. Shares of the Singapore bank are now up at 0.3% at S$9.54 (US$7.58), while Wing Hang Bank is trading 0.08% higher at HK$123.1 apiece.

Write to P.R. Venkat at venkat.pr@wsj.com and Yvonne Lee at yvonne.lee@wsj.com

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