By Toby Sterling AMSTERDAM (Reuters) – Amsterdam Trade Bank (ATB), a subsidiary of Russia’s Alfa Bank, has been declared bankrupt, the Dutch central bank (DNB) said on Friday, citing an Amsterdam District Court Ruling. A statement on the DNB website said ATB depositors would be covered up to 100,000 euros ($108,000) each under the Netherlands’ deposit guarantee system. The bank had around 23,000 customers, of whom most are Dutch but 6,000 are German, the DNB said. According to filings at the Dutch Chamber of Commerce, the bank’s ultimate beneficial owner is Mikhail Fridman, the Russian-Israeli…