Well for financial companies (banks) most of their Book stuff are at market value. Basically most of the stuff on their balance sheet is like held to maturity securities, available for sales and available for trading. The changes in value to these items are usually reflected on the balance sheet and also these assets are the financial industry’s main revenue drivers. There isn’t that much intanigable assets for these banks. The only thing I can think of its brand name and customer list.
Well book value is historic cost, so it’s usually bad. However since bank usually only have liquid asset most of the stuff on the book are market value. Historical cost is bad since its doesn’t reflect the actual cost of asset, while market value does.