The fact is even in the depths of a recession a banking system flush with excess reserves is always in a position to pyramid up its deposit liabilities, to create Uncovered Money Substitutes, regardless of the demand for loans.
Net cash is a traditional measure of excess cash and is calculated by totaling cash, marketable securities and short-term investments, and subtracting current liabilities.
One option is to use excess assets to increase liquidity, by internally securitising loans made in one country and moving them to another to back liabilities there.