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Note 5 - Securities | 6 Months Ended
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Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | Note 5: 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.
|  | June 30, 2015 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Available for S ale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 200,713 |  |  | $ | 464 |  |  | $ | 8,231 |  |  | $ | 192,946 |
States and political subdivisions |  |  | 16,481 |  |  |  | 649 |  |  |  | --- |  |  |  | 17,130 |
Mortgage-backed securities |  |  | 1,530 |  |  |  | 160 |  |  |  | --- |  |  |  | 1,690 |
Corporate debt securities |  |  | 6,991 |  |  |  | 18 |  |  |  | 386 |  |  |  | 6,623 |
Other securities |  |  | 188 |  |  |  | --- |  |  |  | 53 |  |  |  | 135 |
Total securities available for sale |  | $ | 225,903 |  |  | $ | 1,291 |  |  | $ | 8,670 |  |  | $ | 218,524 |
|  | December 31, 2014 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Available for S ale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 197,740 |  |  | $ | 973 |  |  | $ | 4,494 |  |  | $ | 194,219 |
States and political subdivisions |  |  | 18,529 |  |  |  | 851 |  |  |  | --- |  |  |  | 19,380 |
Mortgage-backed securities |  |  | 1,830 |  |  |  | 184 |  |  |  | --- |  |  |  | 2,014 |
Corporate debt securities |  |  | 6,991 |  |  |  | 140 |  |  |  | 27 |  |  |  | 7,104 |
Other securities |  |  | 189 |  |  |  | --- |  |  |  | 62 |  |  |  | 127 |
Total securities available for sale |  | $ | 225,279 |  |  | $ | 2,148 |  |  | $ | 4,583 |  |  | $ | 222,844 |
The amortized costs, gross unrealized gains, gross unrealized losses and fair values for securities held to maturity by major security type are as follows.
|  | June 30, 2015 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Held to M aturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 15,914 |  |  | $ | 302 |  |  | $ | 428 |  |  | $ | 15,788 |
States and political subdivisions |  |  | 138,001 |  |  |  | 5,133 |  |  |  | 1,838 |  |  |  | 141,296 |
Mortgage-backed securities |  |  | 373 |  |  |  | 47 |  |  |  | --- |  |  |  | 420 |
Corporate debt securities |  |  | 1,416 |  |  |  | 6 |  |  |  | 1 |  |  |  | 1,421 |
Total securities held to maturity |  | $ | 155,704 |  |  | $ | 5,488 |  |  | $ | 2,267 |  |  | $ | 158,925 |
|  | December 31, 2014 |
|  | Amortized Costs |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Values |
Held to M aturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and corporations |  | $ | 18,922 |  |  | $ | 350 |  |  | $ | 245 |  |  | $ | 19,027 |
States and political subdivisions |  |  | 140,702 |  |  |  | 6,823 |  |  |  | 727 |  |  |  | 146,798 |
Mortgage-backed securities |  |  | 415 |  |  |  | 51 |  |  |  | --- |  |  |  | 466 |
Corporate debt securities |  |  | 1,413 |  |  |  | 1 |  |  |  | 2 |  |  |  | 1,412 |
Total securities held to maturity |  | $ | 161,452 |  |  | $ | 7,225 |  |  | $ | 974 |  |  | $ | 167,703 |
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.
|  | June 30, 2015 |
|  | 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 |  | $ | 81,425 |  |  | $ | 2,993 |  |  | $ | 88,618 |  |  | $ | 5,666 |
States and political subdivisions |  |  | 27,353 |  |  |  | 965 |  |  |  | 9,509 |  |  |  | 873 |
Corporate debt securities |  |  | 4,882 |  |  |  | 386 |  |  |  | 200 |  |  |  | 1 |
Other securities |  |  | --- |  |  |  | --- |  |  |  | 189 |  |  |  | 53 |
Total |  | $ | 113,660 |  |  | $ | 4,344 |  |  | $ | 98,516 |  |  | $ | 6,593 |
|  | December 31, 2014 |
|  | 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 |  | $ | 6,964 |  |  | $ | 30 |  |  | $ | 156,149 |  |  | $ | 4,709 |
States and political subdivisions |  |  | 1,222 |  |  |  | 35 |  |  |  | 19,818 |  |  |  | 692 |
Corporate debt securities |  |  | 450 |  |  |  | 2 |  |  |  | 1,948 |  |  |  | 27 |
Other securities |  |  | --- |  |  |  | --- |  |  |  | 127 |  |  |  | 62 |
Total |  | $ | 8,636 |  |  | $ | 67 |  |  | $ | 178,042 |  |  | $ | 5,490 |
The Company had 245 securities with a fair value of $212,176 that were temporarily impaired at June 30, 2015. The total unrealized loss on these securities was $10,937. Of the temporarily impaired total, 111 securities with a fair value of $98,516 and an unrealized loss of $6,593 have been in a continuous loss position for twelve months or more. The Company has determined that these securities are temporarily impaired at June 30, 2015 for the reasons set out below. U.S. Government agencies. The unrealized losses in this category of investments were caused by interest rate and market fluctuations. The contractual terms of the investments do not permit the issuer to settle the securities at a price less than the cost basis of each investment. The Company is monitoring bond market trends and developing strategies to address unrealized losses. Because the Company does not intend to sell any of the investments and it is not likely that the Company will be required to sell any of the investments before recovery of its amortized cost basis, which may be at maturity, the Company does not consider these investments to be other-than-temporarily impaired. States and political subdivisions. This category’s unrealized losses are primarily the result of interest rate and market fluctuations. The contractual terms of the investments do not permit the issuer to settle the securities at a price less than the cost basis of each investment. Because the Company does not intend to sell any of the investments and it is not likely that the Company will be required to sell any of the investments before recovery of its amortized cost basis, which may be at maturity, the Company does not consider these investments to be other-than-temporarily impaired. Corporate. The Company’s unrealized losses in corporate debt securities are related to interest rate and market fluctuations. The contractual terms of the investments do not permit the issuer to settle the securities at a price less than the cost basis of each investment. Because the Company does not intend to sell any of the investments before recovery of its amortized cost basis, which may be at maturity, the Company does not consider these investments to be other-than-temporarily impaired. Other securities. The Company holds a small investment in community bank stock. The value of this investment has been negatively affected by market conditions. Because the Company does not intend to sell this investment before recovery of its amortized cost basis, the Company does not consider this investment to be other-than-temporarily impaired. Restricted stock. Restricted stock is reported separately from available-for-sale securities and held-to-maturity securities. As a member of the Federal Reserve and the Federal Home Loan Bank (“FHLB”) of Atlanta, 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. In addition, NBB is eligible to borrow from the FHLB with borrowings collateralized by qualifying assets, primarily residential mortgage loans and NBB’s capital stock investment in the FHLB. Redemption of FHLB stock is subject to certain limitations and conditions. At its discretion, the FHLB may declare dividends on the stock. Management reviews for impairment based upon the ultimate recoverability of the cost basis of the FHLB stock, and at June 30, 2015, 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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