You are on a dangerous path to short it. As the Chinese Minsheng bank lost their 9% share of the Union Bank, they may look for EWBC for a deal, which will either enhance the capital reserve of the EWBC or an open market purchase to run the stock higher.
There is only handful Chinese run bank here in US and they are the easy target of Banks from China which are all looking to find their feet into US market. In long run. I think EWBC is definitely a target for takeover by a Chinese Mainland bank, such as Merchant Bank of China based in Shenzhen.