Does it mean "That is something bad for the banking system"? https://en.oxforddictionaries.com/definition/bankster
The credit-to-GDP gap has reached a critical level in Canada. The BIS defines this as the “difference of the credit-to-GDP ratio from its trend.” That’s bankster for “it compares credit consumption to the output of the economy.” If the level is too high, the amount of private credit is “unjustified.” The lower the number, the more credit can be “safely” consumed. BIS considers anything above 2 to be a strong gap, and anything above 10 to be a critical warning. Breaching 10 results in a banking crisis in two-thirds of economies, within three years.