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Investment securities | 3 Months Ended
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Mar. 31, 2017
Investment securities |
Investment securities | 4. Investment securities: The amortized cost and fair value of investment securities aggregated by investment category at March 31, 2017 and December 31, 2016 are summarized as follows:
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
March 31, 2017 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 20,050 |  | $ | 1 |  | $ | 156 |  | $ | 19,895 |
U.S. Government-sponsored enterprises |  |  | 83,677 |  |  | 72 |  |  | 1,277 |  |  | 82,472 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 14,663 |  |  | 604 |  |  |  |  |  | 15,267 |
Tax-exempt |  |  | 105,894 |  |  | 2,104 |  |  | 461 |  |  | 107,537 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 19,321 |  |  | 47 |  |  | 36 |  |  | 19,332 |
U.S. Government-sponsored enterprises |  |  | 20,213 |  |  | 46 |  |  | 118 |  |  | 20,141 |
Total |  | $ | 263,818 |  | $ | 2,874 |  | $ | 2,048 |  | $ | 264,644 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 6,861 |  | $ | 86 |  | $ | 83 |  | $ | 6,864 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 64 |  |  |  |  |  |  |  |  | 64 |
U.S. Government-sponsored enterprises |  |  | 3,255 |  |  | 176 |  |  |  |  |  | 3,431 |
Total |  | $ | 10,180 |  | $ | 262 |  | $ | 83 |  | $ | 10,359 |
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
December 31, 2016 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 7,570 |  |  |  |  | $ | 132 |  | $ | 7,438 |
U.S. Government-sponsored enterprises |  |  | 82,314 |  | $ | 79 |  |  | 1,480 |  |  | 80,913 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 14,698 |  |  | 566 |  |  | 39 |  |  | 15,225 |
Tax-exempt |  |  | 110,931 |  |  | 2,309 |  |  | 640 |  |  | 112,600 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 21,041 |  |  | 48 |  |  | 47 |  |  | 21,042 |
U.S. Government-sponsored enterprises |  |  | 22,303 |  |  | 48 |  |  | 159 |  |  | 22,192 |
Total |  | $ | 258,857 |  | $ | 3,050 |  | $ | 2,497 |  | $ | 259,410 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 6,862 |  | $ | 72 |  | $ | 67 |  | $ | 6,867 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 68 |  |  | 1 |  |  |  |  |  | 69 |
U.S. Government-sponsored enterprises |  |  | 3,587 |  |  | 191 |  |  |  |  |  | 3,778 |
Total |  | $ | 10,517 |  | $ | 264 |  | $ | 67 |  | $ | 10,714 |
The maturity distribution of the fair value, which is the net carrying amount, of the debt securities classified as available-for-sale at March 31, 2017, is summarized as follows:
|  | Fair |
March 31, 2017 |  | Value |
Within one year |  | $ | 39,613 |
After one but within five years |  |  | 118,950 |
After five but within ten years |  |  | 49,157 |
After ten years |  |  | 17,451 |
|  |  | 225,171 |
Mortgage-backed securities |  |  | 39,473 |
Total |  | $ | 264,644 |
The maturity distribution of the amortized cost and fair value, of debt securities classified as held-to-maturity at March 31, 2017, is summarized as follows:
|  | Amortized |  | Fair |
March 31, 2017 |  | Cost |  | Value |
Within one year |  |  |  |  |  |  |
After one but within five years |  |  |  |  |  |  |
After five but within ten years |  |  |  |  |  |  |
After ten years |  | $ | 6,861 |  | $ | 6,864 |
|  |  | 6,861 |  |  | 6,864 |
Mortgage-backed securities |  |  | 3,319 |  |  | 3,495 |
Total |  | $ | 10,180 |  | $ | 10,359 |
Securities with a carrying value of $142,335 and $144,750 at March 31, 2017 and December 31, 2016, respectively, were pledged to secure public deposits and certain other deposits as required or permitted by law. Securities and short-term investment activities are conducted with a diverse group of government entities, corporations and state and local municipalities. The counterparty’s creditworthiness and type of collateral is evaluated on a case-by-case basis. At March 31, 2017 and December 31, 2016, there were no significant concentrations of credit risk from any one issuer, with the exception of U.S. Government agencies and sponsored enterprises that exceeded 10.0 percent of stockholders’ equity. The fair value and gross unrealized losses of investment securities with unrealized losses for which an other-than-temporary impairment (“OTTI”) has not been recognized at March 31, 2017 and December 31, 2016, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position, are summarized as follows:
|  | Less Than 12 Months |  | 12 Months or More |  | Total |
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |
March 31, 2017 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Treasury securities |  | $ | 17,411 |  | $ | 156 |  |  |  |  |  |  |  | $ | 17,411 |  | $ | 156 |
U.S. Government-sponsored enterprises |  |  | 62,591 |  |  | 1,277 |  |  |  |  |  |  |  |  | 62,591 |  |  | 1,277 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt |  |  | 51,467 |  |  | 544 |  |  |  |  |  |  |  |  | 51,467 |  |  | 544 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 5,769 |  |  | 23 |  | $ | 1,337 |  | $ | 13 |  |  | 7,106 |  |  | 36 |
U.S. Government-sponsored enterprises |  |  | 13,832 |  |  | 66 |  |  | 2,380 |  |  | 52 |  |  | 16,212 |  |  | 118 |
Total |  | $ | 151,070 |  | $ | 2,066 |  | $ | 3,717 |  | $ | 65 |  | $ | 154,787 |  | $ | 2,131 |
|  | Less Than 12 Months |  | 12 Months or More |  | Total |
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |
December 31, 2016 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Treasury securities |  | $ | 7,438 |  | $ | 132 |  |  |  |  |  |  |  | $ | 7,438 |  | $ | 132 |
U.S. Government-sponsored enterprises |  |  | 59,460 |  |  | 1,480 |  |  |  |  |  |  |  |  | 59,460 |  |  | 1,480 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 1,035 |  |  | 39 |  |  |  |  |  |  |  |  | 1,035 |  |  | 39 |
Tax-exempt |  |  | 55,166 |  |  | 707 |  | $ | 226 |  |  |  |  |  | 55,392 |  |  | 707 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 5,917 |  |  | 27 |  |  | 1,496 |  | $ | 20 |  |  | 7,413 |  |  | 47 |
U.S. Government-sponsored enterprises |  |  | 16,412 |  |  | 85 |  |  | 2,712 |  |  | 74 |  |  | 19,124 |  |  | 159 |
Total |  | $ | 145,428 |  | $ | 2,470 |  | $ | 4,434 |  | $ | 94 |  | $ | 149,862 |  | $ | 2,564 |
The Company had 150 investment securities, consisting of 93 tax-exempt state and municipal obligations, six U.S. Treasury securities, 23 U.S. Government-sponsored enterprise securities, and 28 mortgage-backed securities that were in unrealized loss positions at March 31, 2017. Of these securities, eight mortgage-backed securities were in a continuous unrealized loss position for twelve months or more. Management does not consider the unrealized losses on the debt securities, as a result of changes in interest rates, to be OTTI based on historical evidence that indicates the cost of these securities is recoverable within a reasonable period of time in relation to normal cyclical changes in the market rates of interest. Moreover, because there has been no material change in the credit quality of the issuers or other events or circumstances that may cause a significant adverse impact on the fair value of these securities, and management does not intend to sell these securities and it is unlikely that the Company will be required to sell these securities before recovery of their amortized cost basis, which may be maturity, the Company does not consider the unrealized losses to be OTTI at March 31, 2017. There was no OTTI recognized for the three months ended March 31, 2017 and 2016. The Company had 163 investment securities, consisting of 107 tax-exempt state and municipal obligations, two taxable state and municipal obligation, two U.S. Treasury securities, 22 U.S. Government-sponsored enterprise securities and 30 mortgage-backed securities that were in unrealized loss positions at December 31, 2016. Of these securities, nine mortgage-backed securities and two tax-exempt state and municipal securities were in a continuous unrealized loss position for twelve months or more.

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