Deposits

The largest source by far of funds for banks is deposits; money that account holders entrust to the bank for safekeeping and use in future transactions, as well as modest amounts of interest. Generally referred to as "core deposits," these are typically the checking and savings accounts that so many people currently have.

In most cases, these deposits have very short terms. While people will typically maintain accounts for years at a time with a particular bank, the customer reserves the right to withdraw the full amount at any time. Customers have the option to withdraw money upon demand and the balances are fully insured, up to $250,000, therefore, banks do not have to pay much for this money. Many banks pay no interest at all on checking account balances, or at least pay very little, and pay interest rates for savings accounts that are well below U.S. Treasury bond rates.

Wholesale Deposits

If a bank cannot attract a sufficient level of core deposits, that bank can turn to wholesale sources of funds. In many respects these wholesale funds are much like interbank CDs. There is nothing necessarily wrong with wholesale funds, but investors should consider what it says about a bank when it relies on this funding source. While some banks de-emphasiz​e the branch-based deposit-gathering model, in favor of wholesale funding, heavy reliance on this source of capital can be a warning that a bank is not as competitive as its peers.

Investors should also note that the higher cost of wholesale funding means that a bank either has to settle for a narrower interest spread, and lower profits, or pursue higher yields from its lending and investing, which usually means taking on greater risk.

Share Equity

While deposits are the primary source of loanable funds for almost every bank, shareholder equity is an important part of a bank's capital. Several important regulatory ratios are based upon the amount of shareholder capital a bank has and shareholder capital is, in many cases, the only capital that a bank knows will not disappear.

Common equity is straight forward. This is capital that the bank has raised by selling shares to outside investors. While banks, especially larger banks, do often pay dividends on their common shares, there is no requirement for them to do so.

Banks often issue preferred shares to raise capital. As this capital is expensive, and generally issued only in times of trouble, or to facilitate an acquisition, banks will often make these shares callable. This gives the bank the right to buy back the shares at a time when the capital position is stronger, and the bank no longer needs such expensive capital.

Equity capital is expensive, therefore, banks generally only issue shares when they need to raise funds for an acquisition, or when they need to repair their capital position, typically after a period of elevated bad loans. Apart from the initial capital raised to fund a new bank, banks do not typically issue equity in order to fund loans.

Debt

Banks will also raise capital through debt issuance. Banks most often use debt to smooth out the ups and downs in their funding needs, and will call upon sources like repurchase agreements or the Federal Home Loan Bank system, to access debt funding on a short term basis.

There is frankly nothing particularly unusual about bank-issued debt, and like regular corporations, bank bonds may be callable and/or convertible. Although debt is relatively common on bank balance sheets, it is not a critical source of capital for most banks. Although debt/equity ratios are typically over 100% in the banking sector, this is largely a function of the relatively low level of equity at most banks. Seen differently, debt is usually a much smaller percentage of total deposits or loans at most banks and is, accordingly, not a vital source of loanable funds.

Use of Funds

Loans

For most banks, loans are the primary use of their funds and the principal way in which they earn income. Loans are typically made for fixed terms, at fixed rates and are typically secured with real property; often the property that the loan is going to be used to purchase. While banks will make loans with variable or adjustable interest rates and borrowers can often repay loans early, with little or no penalty, banks generally shy away from these kinds of loans, as it can be difficult to match them with appropriate funding sources.

Part and parcel of a bank's lending practices is its evaluation of the credit worthiness of a potential borrower and the ability to charge different rates of interest, based upon that evaluation. When considering a loan, banks will often evaluate the income, assets and debt of the prospective borrower, as well as the credit history of the borrower. The purpose of the loan is also a factor in the loan underwriting decision; loans taken out to purchase real property, such as homes, cars, inventory, etc., are generally considered less risky, as there is an underlying asset of some value that the bank can reclaim in the event of nonpayment.

As such, banks play an under-appreciated role in the economy. To some extent, bank loan officers decide which projects, and/or businesses, are worth pursuing and are deserving of capital.

Consumer Lending

Consumer lending makes up the bulk of North American bank lending, and of this, residential mortgages make up by far the largest share. Mortgages are used to buy residences and the homes themselves are often the security that collateralizes the loan. Mortgages are typically written for 30 year repayment periods and interest rates may be fixed, adjustable, or variable. Although a variety of more exotic mortgage products were offered during the U.S. housing bubble of the 2000s, many of the riskier products, including "pick-a-payment" mortgages and negative amortization loans, are much less common now.