Credit Suisse has agreed to pay a $2.5 billion fine to authorities in the United States for helping Americans evade taxes, after becoming the largest bank in 20 years to plead guilty to a U.S. criminal charge. Switzerland's second largest bank escaped what could have been the worst outcome for its business - its top management stayed in place and it will not have to hand over client data, protected by Swiss secrecy laws. And the New York state bank regulator decided not to revoke the bank's license in the state. U.S. prosecutors said the bank helped clients deceive U.S. tax authorities by concealing assets in illegal, undeclared bank accounts, in a conspiracy that spanned decades, and in one case began more than a century ago. The Justice Department has not often pursued such convictions of financial companies, especially large ones that could become destabilized following an indictment. Credit Suisse will pay the penalties to the U.S. Department of Justice, the Internal Revenue Service, the Federal Reserve and New York's banking regulator, the New York State Department of Financial Services. It had already paid just under $200 million to the Securities and Exchange Commission. Some analysts said clients and counterparties could pull their business due to the guilty plea. The United States has been trying to wrest client data from Swiss banks in a long-standing fight with Switzerland and its bank secrecy laws. The standoff has already forced Wegelin & Co, the oldest Swiss private bank, to close shop after a guilty plea to charges of helping U.S. clients evade taxes.