Note 2: Securities

The amortized cost and estimated fair value of debt securities at December 31, 2023 and 2022, by contractual maturity, are shown below. Maturities may differ from contractual maturities in mortgage-backed securities because the mortgages underlying the securities may be called or repaid without any penalties, therefore, these securities have been included in 1 to 5 years based on average remaining life.

As of December 31, 2023 and 2022, no securities were pledged to secure public deposits or for other purposes as required or permitted by law. At December 31, 2023 and 2022, there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of equity. 

Information pertaining to securities with gross unrealized losses at December 31, 2023 and 2022, aggregated by investment category and length of time that individual securities have been in a continuous loss position, is as follows:

At December 31, 2023 and 2022, certain investment securities were in unrealized loss positions. There were no securities with identified credit losses at December 31, 2023, and no securities with other than temporary impairment losses at December 31, 2022. Unrealized losses have not been recognized into income because, based on management's evaluation, the decline in fair value is largely due to increased market rates, temporary market conditions and trading spreads, and, as such, are considered to be temporary by the Bank. In addition, management has the intent and ability to hold the securities until they mature or they recover their carrying values. 

All U.S. Treasuries, U.S. government agency obligations, mortgage-based residential obligations and collateralized mortgage obligations are agency-issued or government-sponsored enterprise issued. Agency-issued securities are generally guaranteed by a U.S. government agency, such as the Government National Mortgage Association. Government-sponsored enterprises, such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, or the Small Business Administration, have either a direct or implied guarantee by the U.S. government. 

The Bank holds two classifications of municipal bonds, general obligation bonds and revenue bonds. General obligation bonds are backed by the general revenue of the issuing municipality, while revenue bonds are supported by a specific revenue source. All general obligation and revenue bonds have a bond rating of investment grade by Standard and Poor's or Moody's Investor Services or are not rated. There have been no declines in investment grade ratings on bonds in a loss position and as of December 31, 2023, all municipal bonds are paying as agreed. 

The following table represents the proceeds from the sale of securities available-for-sale and the related gross gains and losses during the periods presented.