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Investment securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Schedule of amortized cost and fair value of investment securities aggregated by investment category |
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
September 30, 2018 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 25,941 |  |  |  |  | $ | 711 |  | $ | 25,230 |
U.S. Government-sponsored enterprises |  |  | 95,089 |  |  |  |  |  | 3,317 |  |  | 91,772 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 13,576 |  | $ | 237 |  |  |  |  |  | 13,813 |
Tax-exempt |  |  | 90,535 |  |  | 495 |  |  | 1,061 |  |  | 89,969 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 13,719 |  |  |  |  |  | 134 |  |  | 13,585 |
U.S. Government-sponsored enterprises |  |  | 35,284 |  |  | 1 |  |  | 811 |  |  | 34,474 |
Commercial Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  |  | 6,281 |  |  |  |  |  | 330 |  |  | 5,951 |
Total |  | $ | 280,425 |  | $ | 733 |  | $ | 6,364 |  | $ | 274,794 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 6,856 |  | $ | 2 |  | $ | 185 |  | $ | 6,673 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 45 |  |  |  |  |  |  |  |  | 45 |
U.S. Government-sponsored enterprises |  |  | 1,650 |  |  | 72 |  |  | 5 |  |  | 1,717 |
Total |  | $ | 8,551 |  | $ | 74 |  | $ | 190 |  | $ | 8,435 |
|  |  |  |  | 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 |
September 30, 2018 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Treasury securities |  | $ | 8,711 |  | $ | 169 |  | $ | 16,519 |  | $ | 542 |  | $ | 25,230 |  | $ | 711 |
U.S. Government-sponsored enterprises |  |  | 16,813 |  |  | 337 |  |  | 74,959 |  |  | 2,980 |  |  | 91,772 |  |  | 3,317 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt |  |  | 52,220 |  |  | 893 |  |  | 14,529 |  |  | 353 |  |  | 66,749 |  |  | 1,246 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 6,423 |  |  | 33 |  |  | 7,162 |  |  | 101 |  |  | 13,585 |  |  | 134 |
U.S. Government-sponsored enterprises |  |  | 21,705 |  |  | 322 |  |  | 13,261 |  |  | 494 |  |  | 34,966 |  |  | 816 |
Commercial Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  |  |  |  |  |  |  |  | 5,951 |  |  | 330 |  |  | 5,951 |  |  | 330 |
Total |  | $ | 105,872 |  | $ | 1,754 |  | $ | 132,381 |  | $ | 4,800 |  | $ | 238,253 |  | $ | 6,554 |
|  | 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 | The following is a summary of unrealized and realized gains and losses recognized in net income on equity securities during the three and nine months ended September 30, 2018 (in thousands):
|  |  | Three months ended |  |  | Nine months ended
September 30, 2018 |  |  | September 30, 2018 |  |  | September 30, 2018
Net gains recognized during the period on equity securities |  | $ | 14 |  | $ | 14
Less: Net gains and (losses) recognized during the period on equity securities sold during the period |  |  |  |  |  |
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date |  | $ | 14 |  | $ | 14
Available-for-Sale Securities. |
Schedule of maturity distribution of fair value |
|  | Fair |
September 30, 2018 |  | Value |
Within one year |  | $ | 34,805 |
After one but within five years |  |  | 156,767 |
After five but within ten years |  |  | 16,149 |
After ten years |  |  | 13,063 |
|  |  | 220,784 |
Mortgage-backed securities |  |  | 54,010 |
Total |  | $ | 274,794 |
Held-to-maturity Securities. |
Schedule of maturity distribution of fair value |
|  | Amortized |  | Fair |
September 30, 2018 |  | Cost |  | Value |
Within one year |  |  |  |  |  |  |
After one but within five years |  |  |  |  |  |  |
After five but within ten years |  |  |  |  |  |  |
After ten years |  | $ | 6,856 |  | $ | 6,673 |
|  |  | 6,856 |  |  | 6,673 |
Mortgage-backed securities |  |  | 1,695 |  |  | 1,762 |
Total |  | $ | 8,551 |  | $ | 8,435 |

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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