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Note 3 - Securities | 12 Months Ended
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Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | Note 3: Securities The amortized cost and fair value of securities available for sale, with gross unrealized gains and losses, follows:
|  | December 31, 2014 |
Available for sale: |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
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 |
|  | December 31, 2013 |
Available for sale: |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Government agencies and corporations |  |  | 169,818 |  |  |  | 199 |  |  |  | 22,163 |  |  |  | 147,854 |
States and political subdivisions |  |  | 22,830 |  |  |  | 746 |  |  |  | 120 |  |  |  | 23,456 |
Mortgage-backed securities |  |  | 2,627 |  |  |  | 213 |  |  |  | ---- |  |  |  | 2,840 |
Corporate debt securities |  |  | 7,804 |  |  |  | 97 |  |  |  | 506 |  |  |  | 7,395 |
Other securities |  |  | 189 |  |  |  | --- |  |  |  | 22 |  |  |  | 167 |
Total securities available for sale |  | $ | 203,268 |  |  | $ | 1,255 |  |  | $ | 22,811 |  |  | $ | 181,712 |
The amortized cost and fair value of single maturity securities available for sale at December 31, 2014, 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 at December 31, 2014.
|  | December 31, 20 14 |
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 1,864 |  |  | $ | 1,899 |
Due after one year through five years |  |  | 30,930 |  |  |  | 31,171 |
Due after five years through ten years |  |  | 30,161 |  |  |  | 30,156 |
Due after ten years |  |  | 162,135 |  |  |  | 159,491 |
No maturity |  |  | 189 |  |  |  | 127 |
|  | $ | 225,279 |  |  | $ | 222,844 |
The Company holds restricted stock with the Federal Home Loan Bank and the Federal Reserve. Required ownership amounts are determined by the correspondent banks and 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. The Company held restricted stock of $1,089 as of December 31, 2014 and $1,414 as of December 31, 2013. The amortized cost and fair value of securities held to maturity, with gross unrealized gains and losses, follows:
|  | December 31, 2014 |
Held to maturity: |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
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 |
|  | December 31, 20 13 |
Held to maturity: |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Government agencies and corporations |  | $ | 13,973 |  |  | $ | 280 |  |  | $ | 1,448 |  |  | $ | 12,805 |
States and political subdivisions |  |  | 149,490 |  |  |  | 2,971 |  |  |  | 6,502 |  |  |  | 145,959 |
Mortgage-backed securities |  |  | 520 |  |  |  | 53 |  |  |  | --- |  |  |  | 573 |
Total securities held to maturity |  | $ | 163,983 |  |  | $ | 3,304 |  |  | $ | 7,950 |  |  | $ | 159,337 |
The amortized cost and fair value of single maturity securities held to maturity at December 31, 2014, 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 at December 31, 2014.
|  | December 31, 20 14 |
|  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 1,637 |  |  | $ | 1,650 |
Due after one year through five years |  |  | 4,987 |  |  |  | 5,262 |
Due after five years through ten years |  |  | 24,052 |  |  |  | 25,181 |
Due after ten years |  |  | 130,776 |  |  |  | 135,610 |
|  | $ | 161,452 |  |  | $ | 167,703 |
Information pertaining to securities with gross unrealized losses at December 31, 2014 and 2013 aggregated by investment category and length of time that individual securities have been in a continuous loss position, follows:
|  | December 31, 2014 |
|  | Less Than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
U. S. Government agencies and corporations |  | $ | 6,964 |  |  | $ | 30 |  |  | $ | 156,149 |  |  | $ | 4,709 |
State and political subdivisions |  |  | 1,222 |  |  |  | 35 |  |  |  | 19,818 |  |  |  | 692 |
Corporate debt securities |  |  | 450 |  |  |  | 2 |  |  |  | 1,948 |  |  |  | 27 |
Other securities |  |  | --- |  |  |  | --- |  |  |  | 127 |  |  |  | 62 |
Total temporarily impaired securities |  | $ | 8,636 |  |  | $ | 67 |  |  | $ | 178,042 |  |  | $ | 5,490 |
|  | December 31, 2013 |
|  | Less Than 12 Months |  |  | 12 Months or More |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
U. S. Government agencies and corporations |  | $ | 138,324 |  |  | $ | 20,400 |  |  | $ | 15,796 |  |  | $ | 3,211 |
State and political subdivisions |  |  | 58,013 |  |  |  | 6,131 |  |  |  | 2,697 |  |  |  | 491 |
Corporate debt securities |  |  | 5,511 |  |  |  | 506 |  |  |  | --- |  |  |  | --- |
Other securities |  |  | 167 |  |  |  | 22 |  |  |  | --- |  |  |  | --- |
Total temporarily impaired securities |  | $ | 202,015 |  |  | $ | 27,059 |  |  | $ | 18,493 |  |  | $ | 3,702 |
At December 31, 2014, the Company had 205 securities with a fair value of $186,678 which had total unrealized losses of $5,557. The Company has made the determination that these securities are temporarily impaired at December 31, 2014 for the following reasons: U.S. Government agencies and corporations. The unrealized losses in this category of investments were caused by interest rate 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 the accounting standard of “more likely than not” has not been met for the Company to be required to sell any of these investments before recovery of its amortized cost basis, which may be maturity, the Company does not consider these investments to be other-than-temporarily impaired. State and political subdivisions. This category’s unrealized losses are primarily the result of interest rate fluctuations and also a certain few ratings downgrades brought about by the impact of the economic downturn on states and political subdivisions. The securities remain investment grade and the Company’s analysis did not indicate the existence of a credit loss. 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 the accounting standard of “more likely than not” has not been met for the Company to be required to sell any of the investments before recovery of its amortized cost basis, which may be maturity, the Company does not consider these investments to be other-than-temporarily impaired. Corporate debt securities. The Company’s unrealized losses in corporate debt securities are related to both interest rate fluctuations and ratings downgrades for a limited number of securities. The securities remain investment grade and the Company’s analysis did not indicate the existence of a credit loss. 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 maturity, the Company does not consider these investments to be other-than-temporarily impaired. Other. The Company holds an investment in a small amount of community bank stock. The value of the investment has been negatively affected by market conditions. Because the Company does not intend to sell the investment before recovery of amortized cost basis, the Company does not consider these investments to be other-than-temporarily impaired. At December 31, 2013, the Company had 286 securities with a fair value of $220,508 which were temporarily impaired. The total unrealized loss on these securities, which was attributed to interest rate fluctuations, was $30,761. Because the Company had the ability and intent to hold the securities until maturity or until the cost was recovered, the losses associated with the securities were not considered other than temporary at December 31, 2013. At December 31, 2014 and 2013, securities with a carrying value of $157,951 and $139,873, respectively, were pledged to secure trust deposits and for other purposes as required or permitted by law. 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 totaling approximately $437,847, 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 in the FHLB stock.

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