Illinois state bank regulators closed Seaway Bank & Trust, a Chicago-based bank with 10 branches. It was known as Chicago’s largest black-owned bank. In 2011 it had bought out the failed Milwaukee-based Legacy Bank. A year-long community-based campaign to raise capital fell short, and tonight the FDIC sold most of the bank’s assets to Texas State Bank. The bank had $300 million in deposits, making it one of the largest banks to fail in the last couple of years.