Regulation: A Texas bank is preparing to shut down. No, it's not a failed institution being closed by federal agents. It serves its market. It makes a profit. So what's the trouble? It's sick of the heavy hand of government. Main Street Bank of Kingwood, Texas, is a modest business. It has four branches and employs 60. It earned $11 million in the last year. The 27-year-old bank seems healthy. The business climate it operates in, however, is not. "The regulatory environment makes it very difficult to do what we do," Main Street Chairman Thomas Depping has told the media....