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Note 2 - Investment Securities | 3 Months Ended
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Mar. 31, 2018
Notes to Financial Statements |
Investments in Debt and Equity Instruments, Cash and Cash Equivalents, Unrealized and Realized Gains (Losses) [Text Block] | 2. Investment Securities Investment securities have been classified in the consolidated balance sheets according to management’s intent. Investment securities at March 31, 2018 and December 31, 2017 are summarized as follows:
(In thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
March 31, 2018 |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  | $ | 111,090 |  |  | $ | - |  |  | $ | 4,345 |  |  | $ | 106,745 |
Agency CMO |  |  | 18,720 |  |  |  | - |  |  |  | 471 |  |  |  | 18,249 |
Other debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency notes and bonds |  |  | 70,495 |  |  |  | - |  |  |  | 1,447 |  |  |  | 69,048 |
Municipal obligations |  |  | 71,198 |  |  |  | 743 |  |  |  | 1,140 |  |  |  | 70,801 |
Total securities available for sale |  | $ | 271,503 |  |  | $ | 743 |  |  | $ | 7,403 |  |  | $ | 264,843 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  | $ | 114,902 |  |  | $ | - |  |  | $ | 2,253 |  |  | $ | 112,649 |
Agency CMO |  |  | 15,660 |  |  |  | 1 |  |  |  | 338 |  |  |  | 15,323 |
Other debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency notes and bonds |  |  | 70,013 |  |  |  | - |  |  |  | 985 |  |  |  | 69,028 |
Municipal obligations |  |  | 73,303 |  |  |  | 1,274 |  |  |  | 405 |  |  |  | 74,172 |
Total securities available for sale |  | $ | 273,878 |  |  | $ | 1,275 |  |  | $ | 3,981 |  |  | $ | 271,172 |
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  | $ | 1 |  |  | $ | - |  |  | $ | - |  |  | $ | 1 |
Total securities held to maturity |  | $ | 1 |  |  | $ | - |  |  | $ | - |  |  | $ | 1 |
Agency notes and bonds, agency mortgage-backed securities and agency collateralized mortgage obligations (“CMO”) include securities issued by the Government National Mortgage Association (“GNMA”), a U.S. government agency, and the Federal National Mortgage Association (“FNMA”), the Federal Home Loan Mortgage Corporation (“FHLMC”) and the Federal Home Loan Bank (“FHLB”), which are government-sponsored enterprises. The amortized cost and fair value of debt securities as of March 31, 2018, by contractual maturity, are shown below. Expected maturities of mortgage-backed securities and CMO may differ from contractual maturities because the mortgages underlying the obligations may be prepaid without penalty.
|  | Securities Available for Sale
|  | Amortized Cost |  | Fair Value
(In thousands) |  |  |  |
Due in one year or less |  | $ | 15,335 |  |  | $ | 15,241 |
Due after one year through five years |  |  | 64,630 |  |  |  | 63,251 |
Due after five years through ten years |  |  | 32,072 |  |  |  | 31,459 |
Due after ten years |  |  | 29,656 |  |  |  | 29,898 |
|  |  | 141,693 |  |  |  | 139,849 |
Mortgage-backed securities and CMO |  |  | 129,810 |  |  |  | 124,994 |
|  | $ | 271,503 |  |  | $ | 264,843 |
Information pertaining to investment securities available for sale with gross unrealized losses at March 31, 2018, aggregated by investment category and the length of time that individual investment securities have been in a continuous position, follows.
|  | Number of Investment Positions |  | Fair Value |  | Gross Unrealized Losses
(Dollars in thousands) |  |  |  |  |  |
Continuous loss position less than twelve months: |  |  |  |  |  |
Agency mortgage-backed securities |  |  | 36 |  |  | $ | 31,683 |  |  | $ | 962 |
Agency CMO |  |  | 7 |  |  |  | 2,948 |  |  |  | 77 |
Agency notes and bonds |  |  | 4 |  |  |  | 11,047 |  |  |  | 132 |
Muncipal obligations |  |  | 41 |  |  |  | 21,667 |  |  |  | 502 |
Total less than twelve months |  |  | 88 |  |  |  | 67,345 |  |  |  | 1,673 |
Continuous loss position more than twelve months: |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  |  | 63 |  |  |  | 75,048 |  |  |  | 3,383 |
Agency CMO |  |  | 18 |  |  |  | 11,150 |  |  |  | 394 |
Agency notes and bonds |  |  | 19 |  |  |  | 57,501 |  |  |  | 1,315 |
Muncipal obligations |  |  | 29 |  |  |  | 14,284 |  |  |  | 638 |
Total more than twelve months |  |  | 129 |  |  |  | 157,983 |  |  |  | 5,730 |
Total securities available for sale |  |  | 217 |  |  | $ | 225,328 |  |  | $ | 7,403 |
Information pertaining to investment securities available for sale with gross unrealized losses at December 31, 2017, aggregated by investment category and the length of time that individual investment securities have been in a continuous position, follows. At December 31, 2017, the Company did not have any securities held to maturity with an unrealized loss.
|  | Number of Investment Positions |  | Fair Value |  | Gross Unrealized Losses
(Dollars in thousands) |  |  |  |  |  |
Continuous loss position less than twelve months: |  |  |  |  |  |
Agency mortgage-backed securities |  |  | 37 |  |  | $ | 37,570 |  |  | $ | 400 |
Agency CMO |  |  | 6 |  |  |  | 3,036 |  |  |  | 38 |
Agency notes and bonds |  |  | 4 |  |  |  | 11,119 |  |  |  | 69 |
Muncipal obligations |  |  | 20 |  |  |  | 10,955 |  |  |  | 83 |
Total less than twelve months |  |  | 67 |  |  |  | 62,680 |  |  |  | 590 |
Continuous loss position more than twelve months: |  |  |  |  |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  |  | 60 |  |  |  | 74,960 |  |  |  | 1,853 |
Agency CMO |  |  | 18 |  |  |  | 11,801 |  |  |  | 300 |
Agency notes and bonds |  |  | 19 |  |  |  | 57,909 |  |  |  | 916 |
Muncipal obligations |  |  | 29 |  |  |  | 14,667 |  |  |  | 322 |
Total more than twelve months |  |  | 126 |  |  |  | 159,337 |  |  |  | 3,391 |
Total securities available for sale |  |  | 193 |  |  | $ | 222,017 |  |  | $ | 3,981 |
Management evaluates securities for other-than-temporary impairment at least quarterly, 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 recover in fair value. At March 31, 2018, the U.S. government agency debt securities, including agency notes and bonds, mortgage-backed securities and CMO, and municipal obligations in a loss position had depreciated approximately 3.2% from the amortized cost basis. All of the U.S. government agency securities and municipal obligations are issued by U.S. government agencies, government-sponsored enterprises and municipal governments, or are secured by first mortgage loans and municipal project revenues. These unrealized losses related principally to current interest rates for similar types of securities. In analyzing an issuer’s financial condition, management considers whether the securities are issued by the federal government, its agencies or other governments, whether downgrades by bond rating agencies have occurred, and the results of reviews of the issuer’s financial condition. As the Company has the ability to hold the debt securities until maturity, or the foreseeable future if classified as available for sale, no declines are deemed to be other-than-temporary. While management does not anticipate any credit-related impairment losses at March 31, 2018, additional deterioration in market and economic conditions may have an adverse impact on credit quality in the future. During the three months ended March 31, 2018, the Company realized gross gains of $7,000 and gross losses of $6,000 on sales of available for sale municipal securities and U.S. government agency mortgage-backed CMO’s, respectively. During the three months ended March 31, 2017, the Company did not have any security sales. Certain available for sale debt securities were pledged to secure public fund deposits at March 31, 2018 and December 31, 2017.

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