One of the Brazilian president's top adviser is accused of corruption and the scandal has become a distraction for the government, which is seeking to secure congressional support for a major pension reform.
The average interest rate on all instruments dropped in January, securities commission CNV says.
Eduardo Guardia will assume the post in July and he will also become a partner in the investment bank.
The Central American nation urges a peaceful solution after ordering three Venezuelan diplomats to leave.
President Vázquez also promised that the project will achieve its financial closure next month.
Government-owned Banco de Bienestar said it looked to capture all remittances to Mexico under a new plan; Santander inked correspondent banking deals with two department store chains to expand its nationwide network of services points.