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Note 3 - Investment Securities | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | ( 3 ) Investment Securities Investment securities as of December 31, 2017 are summarized as follows:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Securities Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed |  | $ | 354,931,318 |  |  | $ | 258,049 |  |  | $ | (8,465,948 | ) |  | $ | 346,723,419 |
State, County and Municipal |  |  | 4,493,085 |  |  |  | 22,835 |  |  |  | (23,094 | ) |  |  | 4,492,826 |
Corporate |  |  | 2,047,517 |  |  |  | 12,483 |  |  |  | - |  |  |  | 2,060,000 |
Asset-Backed |  |  | 992,641 |  |  |  | - |  |  |  | (21,982 | ) |  |  | 970,659 |
|  | $ | 362,464,561 |  |  | $ | 293,367 |  |  | $ | (8,511,024 | ) |  | $ | 354,246,904 |
The amortized cost and fair value of investment securities as of December 31, 2017, by contractual maturity, are shown hereafter. Expected maturities may differ from contractual maturities for certain investments because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. This is often the case with mortgage-backed securities, which are disclosed separately in the table below.
|  | Securities Available for Sale |
|  | Amortized Cost |  |  | Fair Value |
Due in One Year or Less |  | $ | 301,299 |  |  | $ | 301,605 |
Due After One Year Through Five Years |  |  | 4,668,954 |  |  |  | 4,658,344 |
Due After Five Years Through Ten Years |  |  | 877,788 |  |  |  | 894,743 |
Due After Ten Years |  |  | 1,685,202 |  |  |  | 1,668,793 |
|  | $ | 7,533,243 |  |  | $ | 7,523,485 |
Mortgage-Backed Securities |  |  | 354,931,318 |  |  |  | 346,723,419 |
|  | $ | 362,464,561 |  |  | $ | 354,246,904 |
Investment securities as of December 31, 2016 are summarized as follows:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Securities Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed |  | $ | 326,694,417 |  |  | $ | 75,743 |  |  | $ | (7,672,786 | ) |  | $ | 319,097,374 |
State, County and Municipal |  |  | 4,572,756 |  |  |  | 18,350 |  |  |  | (30,610 | ) |  |  | 4,560,496 |
|  | $ | 331,267,173 |  |  | $ | 94,093 |  |  | $ | (7,703,396 | ) |  | $ | 323,657,870 |
Proceeds from sales of investments available for sale were $0 in 2017, $25,209,851 in 2016 and $28,273,634 in 2015. Gross realized gains totaled $0 in 2017, $391,976 in 2016 and $207,896 in 2015. Gross realized losses totaled $0 in 2017, $6,753 in 2016 and $196,316 in 2015. Investment securities having a carrying value totaling $175,484,021 and $144,853,885 as of December 31, 2017 and 2016, respectively, were pledged to secure public deposits and for other purposes. Information pertaining to securities with gross unrealized losses at December 31, 2017 and 2016 aggregated by investment category and length of time that individual securities have been in a continuous loss position, follows:
|  | Less Than 12 Months |  |  | 12 Months or Greater |  |  | Total |
|  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed |  | $ | 120,139,340 |  |  | $ | (1,655,223 | ) |  | $ | 190,196,101 |  |  | $ | (6,810,725 | ) |  | $ | 310,335,441 |  |  | $ | (8,465,948 | )
State, County and Municipal |  |  | 2,598,344 |  |  |  | (23,094 | ) |  |  | - |  |  |  | - |  |  |  | 2,598,344 |  |  |  | (23,094 | )
Asset – Backed |  |  | 970,659 |  |  |  | (21,982 | ) |  |  | - |  |  |  | - |  |  |  | 970,659 |  |  |  | (21,982 | )
|  | $ | 123,708,343 |  |  | $ | (1,700,299 | ) |  | $ | 190,196,101 |  |  | $ | (6,810,725 | ) |  | $ | 313,904,444 |  |  | $ | (8,511,024 | )
December 31, 201 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed |  | $ | 174,200,881 |  |  | $ | (3,459,564 | ) |  | $ | 107,481,698 |  |  | $ | (4,213,222 | ) |  | $ | 281,682,579 |  |  | $ | (7,672,786 | )
State, County and Municipal |  |  | 3,487,647 |  |  |  | (30,610 | ) |  |  | - |  |  |  | - |  |  |  | 3,487,647 |  |  |  | (30,610 | )
|  | $ | 177,688,528 |  |  | $ | (3,490,174 | ) |  | $ | 107,481,698 |  |  | $ | (4,213,222 | ) |  | $ | 285,170,226 |  |  | $ | (7,703,396 | )
Management evaluates securities for other-than-temporary impairment at least on a quarterly basis, and more frequently when economic or market concerns warrant such evaluation. Consideration is given to ( 1 ) the length of time and the extent to which the fair value has been less than cost, ( 2 ) the financial condition and near-term prospects of the issuer and ( 3 ) the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value. At December 31, 2017, 130 securities have unrealized losses which have depreciated 2.64 percent from the Company’s amortized cost basis. These securities are guaranteed by either the U.S. Government, other governments or U.S. corporations. In analyzing an issuer’s financial condition, management considers whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred and the results of reviews of the issuer’s financial condition. The unrealized losses are largely due to increases in market interest rates over the yields available at the time the underlying securities were purchased. As management has the ability to hold debt securities until maturity, or for the foreseeable future if classified as available-for-sale, no declines are deemed to be other than temporary. However, the Company did own one asset-backed security at December 31, 2017 which was completely written off during prior years. This investment is comprised of one issuance of a trust preferred security and has no book value.

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