The color blue is widely used by banking and financial institutions. Dark blues like navy convey a sense of professionalism, trustworthiness, and authority. Blue is also frequently associated with many countries and flags, so including shades of blue in your bank logo invokes a sense of patriotism. Some famous blue bank logos are State Bank of India, HDFC, Citibank, Bank of America, Chase Bank, Barclays, and Deutsche Bank.