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INVESTMENT SECURITIES | 12 Months Ended
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Dec. 31, 2017
Investments [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | ## 3. INVESTMENT SECURITIES The cost basis and fair values of investment securities are summarized as follows: Investment securities available for sale:
|  | AT DECEMBER 31, 2017
|  | COST BASIS |  | GROSS UNREALIZED GAINS |  | GROSS UNREALIZED LOSSES |  | FAIR VALUE
|  | (IN THOUSANDS)
U.S. Agency |  | $ | 6,612 |  |  | $ | — |  |  | $ | (40 | ) |  | $ | 6,572 |
Taxable municipal |  |  | 7,198 |  |  |  | 27 |  |  |  | (189 | ) |  |  | 7,036 |
Corporate bonds |  |  | 35,886 |  |  |  | 322 |  |  |  | (424 | ) |  |  | 35,784 |
U.S. Agency mortgage-backed securities |  |  | 79,854 |  |  |  | 611 |  |  |  | (719 | ) |  |  | 79,746 |
Total |  | $ | 129,550 |  |  | $ | 960 |  |  | $ | (1,372 | ) |  | $ | 129,138 |
Investment securities held to maturity:
|  | AT DECEMBER 31, 2017
|  | COST BASIS |  | GROSS UNREALIZED GAINS |  | GROSS UNREALIZED LOSSES |  | FAIR VALUE
|  | (IN THOUSANDS)
U.S. Agency mortgage-backed securities |  | $ | 9,740 |  |  | $ | 149 |  |  | $ | (45 | ) |  | $ | 9,844 |
Taxable municipal |  |  | 22,970 |  |  |  | 203 |  |  |  | (238 | ) |  |  | 22,935 |
Corporate bonds and other securities |  |  | 6,042 |  |  |  | 38 |  |  |  | (48 | ) |  |  | 6,032 |
Total |  | $ | 38,752 |  |  | $ | 390 |  |  | $ | (331 | ) |  | $ | 38,811 |
Investment securities available for sale:
|  | AT DECEMBER 31, 2016
|  | COST BASIS |  | GROSS UNREALIZED GAINS |  | GROSS UNREALIZED LOSSES |  | FAIR VALUE
|  | (IN THOUSANDS)
U.S. Agency |  | $ | 400 |  |  | $ | — |  |  | $ | (2 | ) |  | $ | 398 |
Taxable municipal |  |  | 3,793 |  |  |  | 3 |  |  |  | (174 | ) |  |  | 3,622 |
Corporate bonds |  |  | 34,403 |  |  |  | 194 |  |  |  | (724 | ) |  |  | 33,873 |
U.S. Agency mortgage-backed securities |  |  | 88,738 |  |  |  | 1,132 |  |  |  | (686 | ) |  |  | 89,184 |
Total |  | $ | 127,334 |  |  | $ | 1,329 |  |  | $ | (1,586 | ) |  | $ | 127,077 |
Investment securities held to maturity:
|  | AT DECEMBER 31, 2016
|  | COST BASIS |  | GROSS UNREALIZED GAINS |  | GROSS UNREALIZED LOSSES |  | FAIR VALUE
|  | (IN THOUSANDS)
U.S. Agency mortgage-backed securities |  | $ | 11,177 |  |  | $ | 180 |  |  | $ | (79 | ) |  | $ | 11,278 |
Taxable municipal |  |  | 13,441 |  |  |  | 70 |  |  |  | (348 | ) |  |  | 13,163 |
Corporate bonds and other securities |  |  | 6,047 |  |  |  | 15 |  |  |  | (83 | ) |  |  | 5,979 |
Total |  | $ | 30,665 |  |  | $ | 265 |  |  | $ | (510 | ) |  | $ | 30,420 |
Maintaining investment quality is a primary objective of the Company’s investment policy which, subject to certain limited exceptions, prohibits the purchase of any investment security below a Moody’s Investors Service or Standard &; Poor’s rating of A. At December 31, 2017, 57.8% of the portfolio was rated AAA as compared to 63.5% at December 31, 2016. 9.7% of the portfolio was rated below A or unrated on December 31, 2017. The Company and its subsidiaries, collectively, did not hold securities of any single issuer, excluding U.S. Treasury and U.S. Agencies, that exceeded 10% of shareholders’ equity at December 31, 2017. The book value of securities, both available for sale and held to maturity, pledged to secure public and trust deposits, and certain Federal Home Loan Bank borrowings was $117,181,000 at December 31, 2017 and $104,953,000 at December 31, 2016. The Company realized $115,000 of gross investment security gains in 2017 and 183,000 of gross investment security gains and $6,000 of gross investment security losses in 2016, and $107,000 of gross investment gains and $36,000 of gross investment security losses in 2015. On a net basis, the realized gain for 2017 was $76,000 after factoring in tax expense of $39,000 and the realized gain for 2016 was $117,000 after factoring in tax expense of $60,000, and the realized gain for 2015 was $46,000 after factoring in tax expense of $25,000. Proceeds from sales of investment securities available for sale were $8.1 million for 2017, $9.0 million for 2016, and $3.6 million during 2015. The following table sets forth the contractual maturity distribution of the investment securities, cost basis and fair market values, and the weighted average yield for each type and range of maturity as of December 31, 2017. Yields are not presented on a tax-equivalent basis, but are based upon the cost basis and are weighted for the scheduled maturity. The Company’s consolidated investment securities portfolio had an effective duration of approximately 3.69 years. The weighted average expected maturity for available for sale securities at December 31, 2017 for U.S. Agency, U.S. Agency Mortgage-Backed and Corporate Bond securities was 10.38, 4.60 and 5.44 years, respectively. The weighted average expected maturity for held to maturity securities at December 31, 2017 for U.S. Agency Mortgage-Backed and Corporate Bonds/Taxable Municipals and other securities were 4.57 and 6.51 years. Investment securities available for sale:
|  | AT DECEMBER 31, 2017
|  | U. S. AGENCY |  | U.S. AGENCY MORTGAGE-BACKED SECURITIES |  | CORPORATE BONDS AND OTHER |  | TOTAL INVESTMENT SECURITIES AVAILABLE FOR SALE
|  | (IN THOUSANDS, EXCEPT YIELDS)
COST BASIS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Within 1 year |  | $ | 400 |  |  |  | 1.03 | % |  | $ | 1 |  |  |  | 6.00 | % |  | $ | — |  |  |  | —% |  |  | $ | 401 |  |  |  | 1.04 | %
After 1 year but within 5 years |  |  | — |  |  |  | — |  |  |  | 848 |  |  |  | 2.09 |  |  |  | 10,938 |  |  |  | 2.99 |  |  |  | 11,786 |  |  |  | 2.93 |
After 5 years but within 10 years |  |  | 3,230 |  |  |  | 2.75 |  |  |  | 14,623 |  |  |  | 2.91 |  |  |  | 30,646 |  |  |  | 3.64 |  |  |  | 48,499 |  |  |  | 3.36 |
After 10 years but within 15 years |  |  | — |  |  |  | — |  |  |  | 24,516 |  |  |  | 2.30 |  |  |  | 1,500 |  |  |  | 3.98 |  |  |  | 26,016 |  |  |  | 2.39 |
Over 15 years |  |  | 2,982 |  |  |  | 2.69 |  |  |  | 39,866 |  |  |  | 2.52 |  |  |  | — |  |  |  | — |  |  |  | 42,848 |  |  |  | 2.53 |
Total |  | $ | 6,612 |  |  |  | 2.62 |  |  | $ | 79,854 |  |  |  | 2.52 |  |  | $ | 43,084 |  |  |  | 3.49 |  |  | $ | 129,550 |  |  |  | 2.84 |
FAIR VALUE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Within 1 year |  | $ | 399 |  |  |  |  |  |  | $ | 1 |  |  |  |  |  |  | $ | — |  |  |  |  |  |  | $ | 400 |  |  |  |  |
After 1 year but within 5 years |  |  | — |  |  |  |  |  |  |  | 843 |  |  |  |  |  |  |  | 10,924 |  |  |  |  |  |  |  | 11,767 |  |  |  |  |
After 5 years but within 10 years |  |  | 3,220 |  |  |  |  |  |  |  | 14,859 |  |  |  |  |  |  |  | 30,477 |  |  |  |  |  |  |  | 48,556 |  |  |  |  |
After 10 years but within 15 years |  |  | — |  |  |  |  |  |  |  | 24,301 |  |  |  |  |  |  |  | 1,419 |  |  |  |  |  |  |  | 25,720 |  |  |  |  |
Over 15 years |  |  | 2,953 |  |  |  |  |  |  |  | 39,742 |  |  |  |  |  |  |  | — |  |  |  |  |  |  |  | 42,695 |  |  |  |  |
Total |  | $ | 6,572 |  |  |  |  |  |  | $ | 79,746 |  |  |  |  |  |  | $ | 42,820 |  |  |  |  |  |  | $ | 129,138 |  |  |  |  |
Investment securities held to maturity:
|  | AT DECEMBER 31, 2017
|  | U.S. AGENCY MORTGAGE-BACKED SECURITIES |  | CORPORATE BONDS AND OTHER |  | TOTAL INVESTMENT SECURITIES HELD TO MATURITY
|  | (IN THOUSANDS, EXCEPT YIELDS)
COST BASIS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Within 1 year |  | $ | — |  |  |  | —% |  |  | $ | 2,000 |  |  |  | 1.78 | % |  | $ | 2,000 |  |  |  | 1.78 | %
After 1 year but within 5 years |  |  | 688 |  |  |  | 2.11 |  |  |  | 1,751 |  |  |  | 2.29 |  |  |  | 2,439 |  |  |  | 2.24 |
After 5 years but within 10 years |  |  | 2,081 |  |  |  | 2.49 |  |  |  | 12,797 |  |  |  | 3.57 |  |  |  | 14,878 |  |  |  | 3.42 |
After 10 years but within 15 years |  |  | 2,604 |  |  |  | 3.30 |  |  |  | 11,643 |  |  |  | 3.64 |  |  |  | 14,247 |  |  |  | 3.58 |
Over 15 years |  |  | 4,367 |  |  |  | 3.07 |  |  |  | 821 |  |  |  | 4.75 |  |  |  | 5,188 |  |  |  | 3.34 |
Total |  | $ | 9,740 |  |  |  | 2.94 |  |  | $ | 29,012 |  |  |  | 3.43 |  |  | $ | 38,752 |  |  |  | 3.31 |
FAIR VALUE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Within 1 year |  | $ | — |  |  |  |  |  |  | $ | 1,976 |  |  |  |  |  |  | $ | 1,976 |  |  |  |  |
After 1 year but within 5 years |  |  | 677 |  |  |  |  |  |  |  | 1,734 |  |  |  |  |  |  |  | 2,411 |  |  |  |  |
After 5 years but within 10 years |  |  | 2,075 |  |  |  |  |  |  |  | 12,815 |  |  |  |  |  |  |  | 14,890 |  |  |  |  |
After 10 years but within 15 years |  |  | 2,685 |  |  |  |  |  |  |  | 11,597 |  |  |  |  |  |  |  | 14,282 |  |  |  |  |
Over 15 years |  |  | 4,407 |  |  |  |  |  |  |  | 845 |  |  |  |  |  |  |  | 5,252 |  |  |  |  |
Total |  | $ | 9,844 |  |  |  |  |  |  | $ | 28,967 |  |  |  |  |  |  | $ | 38,811 |  |  |  |  |
The following tables present information concerning investments with unrealized losses as of December 31, 2017 (in thousands):
Total investment securities: |  | LESS THAN 12 MONTHS |  | 12 MONTHS OR LONGER |  | TOTAL
| FAIR VALUE |  | UNREALIZED LOSSES |  | FAIR VALUE |  | UNREALIZED LOSSES |  | FAIR VALUE |  | UNREALIZED LOSSES
U.S. Agency |  | $ | 5,923 |  |  | $ | (39 | ) |  | $ | 399 |  |  | $ | (1) |  |  | $ | 6,322 |  |  | $ | (40 | )
U.S. Agency mortgage-backed securities |  |  | 36,783 |  |  |  | (253 | ) |  |  | 22,625 |  |  |  | (511 | ) |  |  | 59,408 |  |  |  | (764 | )
Taxable municipal |  |  | 8,657 |  |  |  | (109 | ) |  |  | 7,727 |  |  |  | (318 | ) |  |  | 16,384 |  |  |  | (427 | )
Corporate bonds and other securities |  |  | 7,123 |  |  |  | (71 | ) |  |  | 13,655 |  |  |  | (401 | ) |  |  | 20,778 |  |  |  | (472 | )
Total |  | $ | 58,486 |  |  | $ | (472 | ) |  | $ | 44,406 |  |  | $ | (1,231 | ) |  | $ | 102,892 |  |  | $ | (1,703 | )
The following tables present information concerning investments with unrealized losses as of December 31, 2016 (in thousands):
Total investment securities: |  | LESS THAN 12 MONTHS |  | 12 MONTHS OR LONGER |  | TOTAL
| FAIR VALUE |  | UNREALIZED LOSSES |  | FAIR VALUE |  | UNREALIZED LOSSES |  | FAIR VALUE |  | UNREALIZED LOSSES
U.S. Agency |  | $ | 398 |  |  | $ | (2 | ) |  | $ | — |  |  | $ | — |  |  | $ | 398 |  |  | $ | (2 | )
U.S. Agency mortgage-backed securities |  |  | 49,918 |  |  |  | (703 | ) |  |  | 1,576 |  |  |  | (62 | ) |  |  | 51,494 |  |  |  | (765 | )
Taxable municipal |  |  | 13,301 |  |  |  | (522 | ) |  |  | — |  |  |  | — |  |  |  | 13,301 |  |  |  | (522 | )
Corporate bonds and other securities |  |  | 20,380 |  |  |  | (570 | ) |  |  | 6,762 |  |  |  | (237 | ) |  |  | 27,142 |  |  |  | (807 | )
Total |  | $ | 83,997 |  |  | $ | (1,797 | ) |  | $ | 8,338 |  |  | $ | (299 | ) |  | $ | 92,335 |  |  | $ | (2,096 | )
The unrealized losses are primarily a result of increases in market yields from the time of purchase. In general, as market yields rise, the value of securities will decrease; as market yields fall, the fair value of securities will increase. There are 133 positions that are considered temporarily impaired at December 31, 2017. Management generally views changes in fair value caused by changes in interest rates as temporary; therefore, these securities have not been classified as other-than-temporarily impaired. Management has also concluded that based on current information we expect to continue to receive scheduled interest payments as well as the entire principal balance. Furthermore, management does not intend to sell these securities and does not believe it will be required to sell these securities before they recover in value or mature.

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