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Note 4 - Securities | 9 Months Ended
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Sep. 30, 2020
Notes to Financial Statements |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | Note 4: Securities The amortized costs, gross unrealized gains, gross unrealized losses and fair values for securities available for sale by major security type are as follows.
|  | September 30, 2020 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Available for Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 57,906 |  |  | $ | 4,712 |  |  | $ | 25 |  |  | $ | 62,593 |
State and political subdivisions |  |  | 157,528 |  |  |  | 5,936 |  |  |  | 350 |  |  |  | 163,114 |
Mortgage-backed securities |  |  | 254,025 |  |  |  | 4,363 |  |  |  | 64 |  |  |  | 258,324 |
Corporate debt securities |  |  | 3,001 |  |  |  | 319 |  |  |  | --- |  |  |  | 3,320 |
Total securities available for sale |  | $ | 472,460 |  |  | $ | 15,330 |  |  | $ | 439 |  |  | $ | 487,351 |
|  | December 31, 2019 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Available for S ale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 119,903 |  |  | $ | 1,995 |  |  | $ | 775 |  |  | $ | 121,123 |
State and political subdivisions |  |  | 88,092 |  |  |  | 791 |  |  |  | 644 |  |  |  | 88,239 |
Mortgage-backed securities |  |  | 223,173 |  |  |  | 45 |  |  |  | 1,435 |  |  |  | 221,783 |
Corporate debt securities |  |  | 3,998 |  |  |  | 120 |  |  |  | --- |  |  |  | 4,118 |
Total securities available for sale |  | $ | 435,166 |  |  | $ | 2,951 |  |  | $ | 2,854 |  |  | $ | 435,263 |
The amortized cost and fair value of single maturity securities available for sale at September 30, 2020, by contractual maturity, are shown below. 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. Mortgage-backed securities included in these totals are categorized by final maturity.
|  | September 30, 2020 |
|  | Amortized Cost |  |  | Fair Value |
Available for S ale: |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 8,732 |  |  | $ | 8,806 |
Due after one year through five years |  |  | 4,837 |  |  |  | 5,010 |
Due after five years through ten years |  |  | 130,312 |  |  |  | 135,038 |
Due after ten years |  |  | 328,579 |  |  |  | 338,497 |
Total securities available for sale |  | $ | 472,460 |  |  | $ | 487,351 |
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, follows.
|  | September 30, 2020 |
|  | Less Than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
Temporarily Impaired Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 4,972 |  |  | $ | 25 |  |  | $ | --- |  |  | $ | --- |
State and political subdivisions |  |  | 26,545 |  |  |  | 338 |  |  |  | 626 |  |  |  | 12 |
Mortgage-backed securities |  |  | 17,760 |  |  |  | 60 |  |  |  | 5,011 |  |  |  | 4 |
Total |  | $ | 49,277 |  |  | $ | 423 |  |  | $ | 5,637 |  |  | $ | 16 |
|  | December 31, 2019 |
|  | Less Than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
Temporarily I mpaired S ecurities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 53,244 |  |  | $ | 738 |  |  | $ | 38,962 |  |  | $ | 37 |
State and political subdivisions |  |  | 35,934 |  |  |  | 596 |  |  |  | 591 |  |  |  | 48 |
Mortgage-backed securities |  |  | 181,279 |  |  |  | 1,435 |  |  |  | --- |  |  |  | --- |
Total |  | $ | 270,457 |  |  | $ | 2,769 |  |  | $ | 39,553 |  |  | $ | 85 |
The Company had 37 securities with a fair value of $54,914 that were temporarily impaired at September 30, 2020. The total unrealized loss on these securities was $439. Of the temporarily impaired total, 2 securities with a fair value of $5,637 and an unrealized loss of $16 have been in a continuous loss position for twelve months or more. The Company has determined that these securities are temporarily impaired at September 30, 2020 for the reasons set out below. State and political subdivisions. The unrealized loss of $12 on state and political subdivisions securities stemmed from one security with a fair value of $626. The unrealized loss was caused by interest rate and market fluctuations. The Company is monitoring bond market trends to develop strategies to address unrealized losses. Because the Company does not intend to sell the investment and it is not likely that the Company will be required to sell the investment before recovery of the amortized cost basis, which may be at maturity, the Company does not consider the investment to be other-than-temporarily impaired. Mortgage-backed securities. The unrealized loss of $4 on mortgage-backed securities stemmed from one security with a fair value of $5,011. The unrealized loss was caused by interest rate and market fluctuations. The Company is monitoring bond market trends to develop strategies to address unrealized losses. Because the Company does not intend to sell the investment and it is not likely that the Company will be required to sell the investment before recovery of the amortized cost basis, which may be at maturity, the Company does not consider the investment to be other-than-temporarily impaired. Restricted S tock. The Company held restricted stock of $1,279 as of September 30, 2020 and $1,220 at December 31, 2019. Restricted stock is reported separately from available for sale securities. As a member bank of the Federal Reserve system and the Federal Home Loan Bank of Atlanta (“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, current borrowings, 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 $562,220 at September 30, 2020. Management reviews for impairment based upon the ultimate recoverability of the cost basis of the FHLB stock, and at September 30, 2020, management did not determine any impairment. Management regularly monitors the credit quality of the investment portfolio. Changes in ratings are noted and follow-up research on the issuer is undertaken when warranted. Management intends to carefully monitor any changes in bond quality.

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