This excerpt taken from the NRIM 10-K filed Mar 16, 2007.
NOTE 2 Cash and Due from Banks
The Company is required to maintain a $500,000 minimum average daily balance with the Federal Reserve Bank for purposes of settling financial transactions and charges for Federal Reserve Bank services. The Company is also required to maintain cash balances or deposits with the Federal Reserve Bank sufficient to meet its statutory reserve requirements. The average reserve requirement for the maintenance period, which included December 31, 2006, was $0.