Great Western Bank has introduced a variable...

Great Western Bank has introduced a variable interest rate option for its credit cards. The Beverly Hills bank, which is the principal unit of Great Western Financial, will tie interest rates on Visa cards to the 11th District Federal Home Loan Bank cost of funds index. The rate can change at the beginning of each calendar quarter. “A particular advantage of this index is that interest rates typically are both lower and more stable than the prime rate--to which other variable rate bank cards have been tied,” a bank spokesman said.