A San Francisco niche bank that rejected several offers to sell a year ago may be on the block again, according to bank analysts.

Higher-than-normal trading volume in its stock has fueled speculation that $729 million-asset Pacific Bank may be in play. About 229,000 of Pacific's shares changed hands last week -- more than double the normal weekly volume. That came after heightened activity Sept. 3 and Sept. 8, when 496,600 shares were traded.

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