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Note 3 - Securities | 12 Months Ended
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Dec. 31, 2025
Notes to Financial Statements |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | Note 3: Securities The amortized cost and fair value of debt securities available for sale, with gross unrealized gains and losses, as of the dates indicated, follows:
December 31, 2025 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. government agencies and corporations |  | $ | 312,353 |  |  | $ | - |  |  | $ | 24,298 |  |  | $ | 288,055 |
States and political subdivisions |  |  | 177,453 |  |  |  | - |  |  |  | 23,736 |  |  |  | 153,717 |
Mortgage-backed securities |  |  | 210,918 |  |  |  | 129 |  |  |  | 3,406 |  |  |  | 207,641 |
Corporate debt securities |  |  | 5,505 |  |  |  | - |  |  |  | 541 |  |  |  | 4,964 |
Total securities available for sale |  | $ | 706,229 |  |  | $ | 129 |  |  | $ | 51,981 |  |  | $ | 654,377 |
December 31, 2024 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. government agencies and corporations |  | $ | 351,136 |  |  | $ | - |  |  | $ | 40,012 |  |  | $ | 311,124 |
States and political subdivisions |  |  | 178,106 |  |  |  | - |  |  |  | 32,372 |  |  |  | 145,734 |
Mortgage-backed securities |  |  | 143,747 |  |  |  | 24 |  |  |  | 5,473 |  |  |  | 138,298 |
Corporate debt securities |  |  | 6,507 |  |  |  | - |  |  |  | 764 |  |  |  | 5,743 |
U.S. treasury |  |  | 1,000 |  |  |  | - |  |  |  | 1 |  |  |  | 999 |
Total securities available for sale |  | $ | 680,496 |  |  | $ | 24 |  |  | $ | 78,622 |  |  | $ | 601,898 |
The deferred tax asset for the net unrealized loss on securities available for sale was $10,889 as of December 31, 2025 and $16,506 as of December 31, 2024. The deferred tax asset along with other net deferred tax assets is included in other assets on the Consolidated Balance Sheets. The amortized cost and fair value of single maturity securities available for sale, by contractual maturity as of the date indicated, are shown below. Mortgage-backed securities are categorized by final maturity. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
December 31, 2025 |  | Amortized Cost |  |  | Fair Value |
Available for Sale: |  |  |  |  |  |
Due in one year or less |  | $ | 23,709 |  |  | $ | 23,484 |
Due after one year through five years |  |  | 229,721 |  |  |  | 218,251 |
Due after five years through ten years |  |  | 221,520 |  |  |  | 195,181 |
Due after ten years |  |  | 231,279 |  |  |  | 217,461 |
Total securities available for sale |  | $ | 706,229 |  |  | $ | 654,377 |
Information pertaining to securities with gross unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous loss position as of the dates indicated, follows:
|  | Less Than 12 Months |  |  | 12 Months or More |
December 31, 2025 |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |
U.S. government agencies and corporations |  | $ | - |  |  | $ | - |  |  | $ | 288,055 |  |  | $ | 24,298 |
States and political subdivisions |  |  | 1,680 |  |  |  | 364 |  |  |  | 151,652 |  |  |  | 23,372 |
Mortgage-backed securities |  |  | 55,986 |  |  |  | 223 |  |  |  | 99,446 |  |  |  | 3,183 |
Corporate debt securities |  |  | - |  |  |  | - |  |  |  | 4,964 |  |  |  | 541 |
Total temporarily impaired securities |  | $ | 57,666 |  |  | $ | 587 |  |  | $ | 544,117 |  |  | $ | 51,394 |
|  | Less Than 12 Months |  |  | 12 Months or More |
December 31, 2024 |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |
U.S. government agencies and corporations |  | $ | - |  |  | $ | - |  |  | $ | 311,124 |  |  | $ | 40,012 |
States and political subdivisions |  |  | 885 |  |  |  | 118 |  |  |  | 144,849 |  |  |  | 32,254 |
Mortgage-backed securities |  |  | 5,336 |  |  |  | 28 |  |  |  | 115,011 |  |  |  | 5,445 |
Corporate debt securities |  |  | - |  |  |  | - |  |  |  | 5,743 |  |  |  | 764 |
U.S. treasury |  |  | - |  |  |  | - |  |  |  | 999 |  |  |  | 1 |
Total temporarily impaired securities |  | $ | 6,221 |  |  | $ | 146 |  |  | $ | 577,726 |  |  | $ | 78,476 |
The Company evaluates securities available for sale that are in unrealized loss positions to determine whether the impairment is due to credit-related factors or noncredit-related factors. At December 31, 2025, the Company had 522 securities with a fair value of $601,783 in an unrealized loss position. To evaluate credit risk, the Company considers payment history, risk ratings from external parties, financial statements for municipal and corporate securities, public statements from issuers and other available credible published sources in evaluating credit risk. No credit risk was found and no ACL on securities available for sale was recorded as of December 31, 2025 or December 31, 2024. The unrealized losses are attributable to noncredit-related factors, including changes in interest rates and other market conditions. The Company does not have the intent to sell any of these securities and believes that it is more likely than not that the Company will not have to sell any such securities before a recovery of cost. The contractual terms of the investments do not permit the issuers to settle the securities at a price less than the cost basis of the investments. The fair value is expected to recover as the securities approach their maturity date or repricing date or if market yields for such investments decline. Realized Securities Gains and Losses There were no sales of securities in 2025. During 2024, the Company sold securities acquired from FCB shortly after the acquisition date and no gain or loss was recognized. Information pertaining to realized gains and losses on sold securities for the period indicated follows:
|  | Sale of Available for Sale Securities |
For the Year Ended December 31, |  | Proceeds |  |  | Book Value |  |  | Gross Gain |  |  | Gross Loss |  |  | Net Loss |
2024 |  |  | 9,279 |  |  |  | 9,279 |  |  |  | - |  |  |  | - |  |  |  | - |
Restricted Stock The Company held restricted stock of $1,848 as of December 31, 2025 and December 31, 2024. Restricted stock is included in other assets. As a member of the Federal Reserve and the FHLB, NBB is required to maintain certain minimum investments in the common stock of those entities. Required levels of investment are based upon NBB’s capital and a percentage of qualifying assets. The Company purchases stock from or sells stock back to the correspondents based on their calculations. The stock is held by member institutions only and is not actively traded. Redemption of FHLB stock is subject to certain limitations and conditions. At its discretion, the FHLB may declare dividends on the stock. In addition to dividends, NBB also benefits from its membership with FHLB through eligibility to borrow from the FHLB, using as collateral NBB’s capital stock investment in the FHLB and qualifying NBB real estate mortgage loans totaling $517,382 as of December 31, 2025. Management reviews for impairment based upon the ultimate recoverability of the cost basis of the FHLB stock, and as of December 31, 2025, management did not determine any impairment. Pledged Securities As of December 31, 2025 and 2024, securities with a carrying value of $654,370 and $536,260, respectively, were pledged to secure municipal deposits and Federal Reserve discount window borrowing capacity.

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