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Investment securities (Tables) | 6 Months Ended
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Jun. 30, 2018
Schedule of amortized cost and fair value of investment securities aggregated by investment category |
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
June 30, 2018 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 25,934 |  |  |  |  | $ | 587 |  | $ | 25,347 |
U.S. Government-sponsored enterprises |  |  | 95,179 |  |  |  |  |  | 3,131 |  |  | 92,048 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 13,607 |  | $ | 302 |  |  |  |  |  | 13,909 |
Tax-exempt |  |  | 95,220 |  |  | 736 |  |  | 822 |  |  | 95,134 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 15,809 |  |  |  |  |  | 109 |  |  | 15,700 |
U.S. Government-sponsored enterprises |  |  | 27,461 |  |  | 1 |  |  | 523 |  |  | 26,939 |
Commercial Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  |  | 6,292 |  |  |  |  |  | 319 |  |  | 5,973 |
Total |  | $ | 279,502 |  | $ | 1,039 |  | $ | 5,491 |  | $ | 275,050 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 6,857 |  | $ | 6 |  | $ | 109 |  | $ | 6,754 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 48 |  |  | 1 |  |  |  |  |  | 49 |
U.S. Government-sponsored enterprises |  |  | 1,875 |  |  | 84 |  |  | 4 |  |  | 1,955 |
Total |  | $ | 8,780 |  | $ | 91 |  | $ | 113 |  | $ | 8,758 |
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
December 31, 2017 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 20,042 |  |  |  |  | $ | 228 |  | $ | 19,814 |
U.S. Government-sponsored enterprises |  |  | 95,358 |  | $ | 30 |  |  | 1,740 |  |  | 93,648 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 14,559 |  |  | 488 |  |  |  |  |  | 15,047 |
Tax-exempt |  |  | 103,199 |  |  | 1,136 |  |  | 502 |  |  | 103,833 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 14,517 |  |  | 2 |  |  | 85 |  |  | 14,434 |
U.S. Government-sponsored enterprises |  |  | 19,752 |  |  | 10 |  |  | 231 |  |  | 19,531 |
Commercial Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  |  | 6,315 |  |  |  |  |  | 120 |  |  | 6,195 |
Total |  | $ | 273,742 |  | $ | 1,666 |  | $ | 2,906 |  | $ | 272,502 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 6,859 |  | $ | 152 |  | $ | 13 |  | $ | 6,998 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 54 |  |  |  |  |  |  |  |  | 54 |
U.S. Government-sponsored enterprises |  |  | 2,361 |  |  | 138 |  |  | 4 |  |  | 2,495 |
Total |  | $ | 9,274 |  | $ | 290 |  | $ | 17 |  | $ | 9,547 |
Schedule of fair value and unrealized losses of investment securities in continuous unrealized loss position |
|  | Less Than 12 Months |  | 12 Months or More |  | Total |
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |
June 30, 2018 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Treasury securities |  | $ | 22,935 |  | $ | 479 |  | $ | 2,412 |  | $ | 108 |  | $ | 25,347 |  | $ | 587 |
U.S. Government-sponsored enterprises |  |  | 41,517 |  |  | 1,142 |  |  | 50,531 |  |  | 1,989 |  |  | 92,048 |  |  | 3,131 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt |  |  | 61,299 |  |  | 820 |  |  | 3,956 |  |  | 111 |  |  | 65,255 |  |  | 931 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 11,211 |  |  | 44 |  |  | 4,328 |  |  | 65 |  |  | 15,539 |  |  | 109 |
U.S. Government-sponsored enterprises |  |  | 20,761 |  |  | 367 |  |  | 6,062 |  |  | 160 |  |  | 26,823 |  |  | 527 |
Commercial Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  |  | 5,973 |  |  | 319 |  |  |  |  |  |  |  |  | 5,973 |  |  | 319 |
Total |  | $ | 163,696 |  | $ | 3,171 |  | $ | 67,289 |  | $ | 2,433 |  | $ | 230,985 |  | $ | 5,604 |
|  | Less Than 12 Months |  | 12 Months or More |  | Total |
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |
December 31, 2017 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Treasury securities |  | $ | 17,350 |  | $ | 170 |  | $ | 2,464 |  | $ | 58 |  | $ | 19,814 |  | $ | 228 |
U.S. Government-sponsored enterprises |  |  | 39,096 |  |  | 445 |  |  | 51,365 |  |  | 1,295 |  |  | 90,461 |  |  | 1,740 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt |  |  | 54,788 |  |  | 454 |  |  | 3,808 |  |  | 61 |  |  | 58,596 |  |  | 515 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 9,484 |  |  | 39 |  |  | 3,968 |  |  | 46 |  |  | 13,452 |  |  | 85 |
U.S. Government-sponsored enterprises |  |  | 12,537 |  |  | 103 |  |  | 6,504 |  |  | 132 |  |  | 19,041 |  |  | 235 |
Commercial Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  |  | 6,195 |  |  | 120 |  |  |  |  |  |  |  |  | 6,195 |  |  | 120 |
Total |  | $ | 139,450 |  | $ | 1,331 |  | $ | 68,109 |  | $ | 1,592 |  | $ | 207,559 |  | $ | 2,923 |
Summary of unrealized and realized gains and losses | At June 30, 2018, the fair value of our equity portfolio was equal to our cost basis. The following is a summary of unrealized and realized gains and losses recognized in net income on equity securities during the three and six months ended June 30, 2018 (in thousands):
|  |  | Three months ended |  |  | Six months ended
June 30, 2018 |  |  | June 30, 2018 |  |  | June 30, 2018
Net gains and (losses) recognized during the period on equity securities |  | $ | 8 |  | $ |
Less: Net gains and (losses) recognized during the period on equity securities sold during the period |  |  |  |  |  |
Unrealized gains and (losses) recognized during the reporting period on equity securities still held at the reporting date |  | $ | 8 |  | $ |
Available-for-Sale Securities. |
Schedule of maturity distribution of fair value |
|  | Fair |
June 30, 2018 |  | Value |
Within one year |  | $ | 22,297 |
After one but within five years |  |  | 172,695 |
After five but within ten years |  |  | 17,531 |
After ten years |  |  | 13,915 |
|  |  | 226,438 |
Mortgage-backed securities |  |  | 48,612 |
Total |  | $ | 275,050 |
Held-to-maturity Securities. |
Schedule of maturity distribution of fair value |
|  | Amortized |  | Fair |
June 30, 2018 |  | Cost |  | Value |
Within one year |  |  |  |  |  |  |
After one but within five years |  |  |  |  |  |  |
After five but within ten years |  |  |  |  |  |  |
After ten years |  | $ | 6,857 |  | $ | 6,754 |
|  |  | 6,857 |  |  | 6,754 |
Mortgage-backed securities |  |  | 1,923 |  |  | 2,004 |
Total |  | $ | 8,780 |  | $ | 8,758 |

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